You searched for subject:(One electron Oxidation of Palladium AND Platinum).
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1.
Remy, Matthew Sean.
Group 10 Methyl Transfer Reactions toward Catalyst Development for Oxidative Oligomerization of Methane.
Degree: PhD, Chemistry, 2011, University of Michigan
URL: http://hdl.handle.net/2027.42/86311 
► Abstract Group 10 Methyl Transfer Reactions toward Catalyst Development for Oxidative Oligomerization of Methane by Matthew Sean Remy Chair: Melanie S. Sanford One of the…
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▼ Abstract
Group 10 Methyl Transfer Reactions toward Catalyst Development for Oxidative Oligomerization of Methane
by
Matthew Sean Remy
Chair: Melanie S. Sanford
One of the challenges of developing a homogeneous catalyst for oxidative oligomerization of methane (OOM) is promoting a C–C coupling reaction from the product of alkane C–H activation. Heterolytic C–H activation of methane almost exclusively generates a monoalkyl-metal species. In order to make a new C–C bond, it is proposed that a polymethyl intermediate must be generated.
Our studies showed that aryl disproportionation is far more favorable than methyl disproportionation. Careful tuning of ancillary ligands at monomethyl-
palladium(II) complexes using density functional theory (DFT) calculations facilitated optimization of thermodynamics for methyl disproportionation. This allowed the first observed disproportionation reaction to form a dimethyl-
palladium(II) complex.
Heating dimethyl complex (tBu-bpy)PdII(CH3)2 (tBu-bpy = 4,4-ditertbutyl-2,2-bipyridine) to 100 °C produced a mixture of methane and ethane over 24 h.
One-
electron oxidants and 1,4-benzoquinone were found to be effective promoters of ethane formation from (tBu-bpy)PdII(CH3)2 at 25 °C. Mechanistic study of
one-
electron oxidation uncovered an oxidatively-induced methyl transfer reaction which produced ethane from [(tBu-bpy)PdIV(CH3)3(solvent)]+. Subsequently,
one-
electron oxidation of complexes of the general formula (tBu-bpy)PdII(CH3)X was developed as an effective method for generation of ethane from monomethyl-
palladium(II) complexes.
Platinum complexes, (N–N)PtII(CH3)2, similarly undergo
one-
electron to produce [(N–N)PtIV(CH3)3(solvent)]+. However, these
platinum(IV) products are generally stable to reductive elimination of ethane. When the N–N ligand is designed to have steric interactions with axial ligands of
platinum(IV), ethane reductive elimination becomes favorable, occurring cleanly over 8.5 hours in acetone and over 1 h in dichloromethane.
This document describes experimental evidence for the generation of polymethyl
palladium and
platinum complexes from model
palladium(II) and
platinum(II) products of C–H activation subsequent ethane elimination from the polymethyl complexes.
In an unrelated project, N-insertion into
palladium-carbon bond was observed when
palladium(II) complexes of bidentate C–N ligands were reacted with an iminoiodinane oxidant. The reaction was proposed to occur through an imido-
palladium(IV) intermediate.
Advisors/Committee Members: Sanford, Melaine S. (committee member), Banaszak Holl, Mark M. (committee member), Hollenberg, Paul F. (committee member), Lehnert, Nicolai (committee member).
Subjects/Keywords: One-electron Oxidation of Palladium and Platinum; Methyl Group Transfer; Gas to Liquids; Chemistry; Science
…84
One-Electron Oxidation of Monomethyl Palladium(II) Complexes… …76
Scheme 3.44 One-Electron Oxidation of Dimethyl-platinum Diimine Complexes.38 ..... 76… …87
Scheme 4.8 Proposed Palladium(III) in the One-Electron Oxidation of 2… …120
Stoichiometric Studies of Disproportionation, One-Electron Oxidation and Reductive… …3.40 One-Electron Oxidation of 1 to Produce Ethane…
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APA (6th Edition):
Remy, M. S. (2011). Group 10 Methyl Transfer Reactions toward Catalyst Development for Oxidative Oligomerization of Methane. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/86311
Chicago Manual of Style (16th Edition):
Remy, Matthew Sean. “Group 10 Methyl Transfer Reactions toward Catalyst Development for Oxidative Oligomerization of Methane.” 2011. Doctoral Dissertation, University of Michigan. Accessed March 05, 2021.
http://hdl.handle.net/2027.42/86311.
MLA Handbook (7th Edition):
Remy, Matthew Sean. “Group 10 Methyl Transfer Reactions toward Catalyst Development for Oxidative Oligomerization of Methane.” 2011. Web. 05 Mar 2021.
Vancouver:
Remy MS. Group 10 Methyl Transfer Reactions toward Catalyst Development for Oxidative Oligomerization of Methane. [Internet] [Doctoral dissertation]. University of Michigan; 2011. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2027.42/86311.
Council of Science Editors:
Remy MS. Group 10 Methyl Transfer Reactions toward Catalyst Development for Oxidative Oligomerization of Methane. [Doctoral Dissertation]. University of Michigan; 2011. Available from: http://hdl.handle.net/2027.42/86311
2.
Kouame, Bitty Roméo Serge.
Étude de la valorisation de molécules bio-sourcées par conversion électrocatalytique : Study of the valuation of bio-sourced molecules by electrocatalytic conversion.
Degree: Docteur es, Chimie théorique, physique, analytique, 2020, Poitiers
URL: http://www.theses.fr/2020POIT2269
► Le glycérol est formé comme produit secondaire à hauteur de 10 wt% lors du processus de trans-estérification d’huiles végétales pour la production d’ester méthyliques et…
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▼ Le glycérol est formé comme produit secondaire à hauteur de 10 wt% lors du processus de trans-estérification d’huiles végétales pour la production d’ester méthyliques et est donc considéré comme un déchet. Ses stocks à travers le monde augmentent significativement. Or, la conversion du glycérol peut permettre d’obtenir des composés à haute valeur ajoutée pour le domaine de la chimie fine, la cosmétique, les détergents l’alimentaire etc., avec la co-production d’énergie électrique ou d’hydrogène lorsqu’elle est réalisée dans des réacteurs électrochimiques. De catalyseurs mono-et bimétallique à base de platine d’une part (Pt/C, PtxAg10-x/C, PtxBi10-x/C, PtxCu10-x/C, PtxCo10-x/C, PtxIn10-x/C, PtxNi10-x/C, avec x=1, 2 et 3) et de palladium d’autre part (Pd/C, Pd9Bi1/C, Pd7Cu3/C, Pd7In3/C et Pd7Ag3/C) ont été synthétisés avec pour objectif d’électro-oxyder le glycérol en aldéhyde et/ou cétone. Ces matériaux ont été caractérisés par des méthodes physico-chimiques et électrochimiques afin d’établir une corrélation structure de surface/réponse électrochimique. Les réactivités du glycérol et du diglycérol ont été évaluées en milieu alcalin pour déterminer le catalyseur offrant la meilleure conversion. La sélectivité des catalyseurs a été étudiée par spectroscopie infrarouge in-situ. Les meilleurs catalyseurs en termes d’activité et de sélectivité ont été utilisés dans une cellule d’électrolyse de 100 cm² pour accumuler les produits de réactions et les analyser. Enfin, l’amination réductrice par l’ammoniac d’une part et la n-butylamine d’autre part sur les produits d’intérêt (glycéraldéhyde/dihydroxyacétone) a été réalisée avec succès.
Glycerol is a by-product of the transesterification reaction of vegetable oils by methanol leading to the formation of methyl ester (methanolysis), with the weight ratio of 10 wt.%. Stocks are increasing significantly worldwide. Glycerol can be converted into high added value compounds of interest for industries of fine chemistry, cosmetic, detergent, food, etc., together with the co-production of electrical energy or hydrogen when its conversion is performed in electrochemical reactors. On the one hand, Pt-based mono and bimetallic catalysts (Pt/C, PtxAg10-x/C, PtxBi10-x/C, PtxCu10-x/C, PtxCo10-x/C, PtxIn10-x/C, PtxNi10-x/C, with x = 1, 2 or 3) catalysts and, on the other hand, palladium-based (Pd/C, Pd9Bi1/C, Pd7Cu3/C, Pd7In3/C and Pd7Ag3/C) catalysts have been synthesized by a wet chemistry method and characterized, with the objective of favor the electrooxidation reaction of glycerol and diglycerol towards aldehydes and ketones. The reactivity of glycerol and diglycerol was evaluated in an alkaline medium to determine the catalyst offering the best conversion. The selectivity of catalysts was studied by in-situ infrared spectroscopy. The best catalysts in terms of activity and selectivity were used at the anode of a 100 cm² electrolysis cell and electrolyses of alkaline solutions of glycerol or diglycerol were carried out at different voltages in order to evaluate the distribution of the…
Advisors/Committee Members: Coutanceau, Christophe (thesis director), Baranton, Stève (thesis director), Oliveira Vigier, Karine de (thesis director).
Subjects/Keywords: Électro-Oxydation de glycérol et diglycérol; Platine; Palladium; Amine; Electro-Oxidation of glycerol and diglycerol; Platinum; Palladium; Amine; 541.37
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APA (6th Edition):
Kouame, B. R. S. (2020). Étude de la valorisation de molécules bio-sourcées par conversion électrocatalytique : Study of the valuation of bio-sourced molecules by electrocatalytic conversion. (Doctoral Dissertation). Poitiers. Retrieved from http://www.theses.fr/2020POIT2269
Chicago Manual of Style (16th Edition):
Kouame, Bitty Roméo Serge. “Étude de la valorisation de molécules bio-sourcées par conversion électrocatalytique : Study of the valuation of bio-sourced molecules by electrocatalytic conversion.” 2020. Doctoral Dissertation, Poitiers. Accessed March 05, 2021.
http://www.theses.fr/2020POIT2269.
MLA Handbook (7th Edition):
Kouame, Bitty Roméo Serge. “Étude de la valorisation de molécules bio-sourcées par conversion électrocatalytique : Study of the valuation of bio-sourced molecules by electrocatalytic conversion.” 2020. Web. 05 Mar 2021.
Vancouver:
Kouame BRS. Étude de la valorisation de molécules bio-sourcées par conversion électrocatalytique : Study of the valuation of bio-sourced molecules by electrocatalytic conversion. [Internet] [Doctoral dissertation]. Poitiers; 2020. [cited 2021 Mar 05].
Available from: http://www.theses.fr/2020POIT2269.
Council of Science Editors:
Kouame BRS. Étude de la valorisation de molécules bio-sourcées par conversion électrocatalytique : Study of the valuation of bio-sourced molecules by electrocatalytic conversion. [Doctoral Dissertation]. Poitiers; 2020. Available from: http://www.theses.fr/2020POIT2269
Univerzitet u Beogradu
3.
Milikić, Jadranka, 1987-.
Elektrokatalitički materijali za oksidaciju
borhidrida.
Degree: Fakultet za fizičku hemiju, 2017, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:14869/bdef:Content/get
► Fizička hemija - Fizička hemija materijala i elektrohemija / Physical chemistry - Physical Chemistry of Materials and Electrochemistry
Danas se kao primarni izvori energije u…
(more)
▼ Fizička hemija - Fizička hemija materijala i
elektrohemija / Physical chemistry - Physical Chemistry of
Materials and Electrochemistry
Danas se kao primarni izvori energije u industriji
koriste fosilna goriva, nafta i prirodan gas. Zalihe navedenih
goriva su ograničene, a i posledice korišćenja ovih goriva su veoma
nepovoljne po životnu sredinu pa se traga za obnovljivim i ekološki
prihvatljivijim izvorima energije. Usled svetske energetske krize,
koja još uvek traje, značajno je oživelo naučno i tehnološko
interesovanje za NaBH4 za skladištenje ili kao izvor energije. Prva
istraživanja su se odnosila na skladištenje vodonika dok je nešto
kasnije pomenuta direktna elektrooksidacija NaBH4 za primenu u
direktnim borhidridnim gorivnim ćelijama. Gorivne ćelije su
elektrohemijske ćelije, koje hemijsku energiju goriva pretvaraju u
električnu energiju. Danas primenu prvenstveno imaju u
automobilskoj industriji, jer ne postoje zagađujući izduvni gasovi,
što ima blagotvoran uticaj na životnu sredinu. Na osnovu brojnih
istraživanja zlato i srebro pokazuju najbolju elektrohemijsku
efikasnost u elektrooksidaciji borhidrida, gde je postignut visok
prinos elektrona, za razliku od npr. platine gde je prinos manji.
Međutim, treba istaći da je zlato veoma skupo i ima sporu kinetiku
elektrooksidacije borhidrida pa se zato traga za novim
elektrokatalizatorima. Cilj ovog rada je analiza anodnih materijala
za oksidaciju natrijum borhidrida i njihova primena u direktnim
borhidridnim gorivnim ćelijama. U okviru ovog rada testirano je pet
materijala sa različitim masenim sadržajima gradivnih komponenti.
Testirane su komercijalne legure platine i nikla ili kobalta na
ugljeničnoj osnovi, zatim, legure platina retke zemlje (od kojih je
testiran disprozijum), takođe, nikal i elementi retke zemlje
(disprozijum i samarijum), potom, elektrokatalizatori paladijuma
sintetisani na dve različite ugljenične osnove i
elektrokatalizatori srebra sintetisanih na ugljeniku. Od pomenutih
elektrokatalizatora pokazano je da je najefikasniji za oksidaciju
borhidrida platina-nikal ili kobalt. Efikasnost je utvrđena na
osnovu brojnih elektrohemijskih i kinetičkih parametara. Zapravo,
pomenuti elektrokatalizatori platine pre svega daju najveće gustine
struje, najnižu energiju aktivacije i najveći broj razmenjenih
elektrona.Veoma je bitno i napomenuti i cenu ovih
elektrokatalizatora koja je svakako niža od čiste platine na
ugljeniku. Slično ponašanje su pokazali i testrani
elektrokatalizatori paladijuma, koji takođe ima nižu cenu od
platine. Nešto manju efikasnost za oksidaciju borhidrida pokazale
su redom nikal-retke zemlje, platina-retke zemlje, dok su najmanje
aktivni elektrokatalizatori na bazi srebra...
Advisors/Committee Members: Šljukić-Paunković, Biljana..
Subjects/Keywords: direct borohydride fuel cell; sodium borohydride
oxidation reaction; alloys of platinum and transition metals;
alloys of platinum and dysrposium; alloys of nickel and rare
earths; palladium electrocatalysts; silver
electrocatalysts
Record Details
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Record Details
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APA ·
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MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Milikić, Jadranka, 1. (2017). Elektrokatalitički materijali za oksidaciju
borhidrida. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:14869/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Milikić, Jadranka, 1987-. “Elektrokatalitički materijali za oksidaciju
borhidrida.” 2017. Thesis, Univerzitet u Beogradu. Accessed March 05, 2021.
https://fedorabg.bg.ac.rs/fedora/get/o:14869/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Milikić, Jadranka, 1987-. “Elektrokatalitički materijali za oksidaciju
borhidrida.” 2017. Web. 05 Mar 2021.
Vancouver:
Milikić, Jadranka 1. Elektrokatalitički materijali za oksidaciju
borhidrida. [Internet] [Thesis]. Univerzitet u Beogradu; 2017. [cited 2021 Mar 05].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:14869/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Milikić, Jadranka 1. Elektrokatalitički materijali za oksidaciju
borhidrida. [Thesis]. Univerzitet u Beogradu; 2017. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:14869/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Houston
4.
Bugosh, Greg.
Performance Studies of Multifunctional Pt/Pd Monolithic Catalysts for Hydrocarbon Oxidation Emission Control.
Degree: PhD, Chemical Engineering, 2015, University of Houston
URL: http://hdl.handle.net/10657/4874
► The catalytic aftertreatment of combustion engine exhaust is critically important to their continued use from both environmental and economic standpoints. This dissertation investigates the performance…
(more)
▼ The catalytic aftertreatment of combustion engine exhaust is critically important to their continued use from both environmental and economic standpoints. This dissertation investigates the performance of multifunctional Pt/Pd monolithic
oxidation catalysts for hydrocarbon emission control. This is accomplished through several related yet distinct studies.
First, addition of zeolite beta was investigated with aim of improving cold-start performance. Focus was placed on hydrocarbon (HC) storage and light-off behavior. Dodecane (C12) and carbon monoxide (CO) were used as representative pollutants. Individual reactant feeds, co-feeds, and pre-storage experiments provided insight into the effects of additional zeolite on catalyst performance. Increased zeolite loading subsequently increased the C12 storage capacity. The zeolite did not have a notable effect on the light-off behavior for single component feeds. Pre-storing HC had an inhibitory effect on the CO-light-off and the co-feed of C12 and CO increased the CO light-off temperatures even further.
Next, the construction of a spatially resolved capillary-inlet sampling system for in-channel concentration measurements is described. A study on propylene
oxidation was conducted and the newly built sampling technique was utilized. A monolith reactor model was used to simulate the propylene
oxidation reaction system in terms of effluent conversions and propylene concentration profiles. The model and data show good agreement.
Evaluation of third party proprietary catalysts (
oxidation and NSCR) was performed utilizing a more complex feed stream. The performance of these metallic substrate catalysts was compared to the model Pt/Pd catalyst, followed by additional experiments to develop a more fundamental understanding. For NSCR testing, the optimum O2 feed to convert both NOx and HC/CO was dependent on temperature. Increased methane conversion at low O2 feed concentrations prompted further investigation.
Finally, methane
oxidation by Pt/Pd monolith was examined over a wide range of temperatures and oxygen feed concentrations. A clockwise hysteresis loop exists in the rich regime consisting of two stable steady-states of methane conversion. The high steady-state conversion branch is eclipsed by multiple higher methane conversion branches that are transient in nature. The methane consumption observed under lean conditions is insensitive to the oxygen concentration and is classical lean methane
oxidation on PdO. Spatially resolved capillary-inlet mass spectrometry (SpaciMS) measurements were utilized to reveal
oxidation and partial
oxidation reaction zones within the monolith catalyst. During operation in the rich regime, a front oxidative zone and downstream partial
oxidation/reforming zone co-exist.
Advisors/Committee Members: Harold, Michael P. (advisor), Epling, William S. (committee member), Luss, Dan (committee member), Brankovic, Stanko R. (committee member), Meen, James K. (committee member).
Subjects/Keywords: DOC; Emissions; Hydrocarbons; Methane; Oxidation; Platinum; Palladium; Monoliths; SpaciMS
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bugosh, G. (2015). Performance Studies of Multifunctional Pt/Pd Monolithic Catalysts for Hydrocarbon Oxidation Emission Control. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/4874
Chicago Manual of Style (16th Edition):
Bugosh, Greg. “Performance Studies of Multifunctional Pt/Pd Monolithic Catalysts for Hydrocarbon Oxidation Emission Control.” 2015. Doctoral Dissertation, University of Houston. Accessed March 05, 2021.
http://hdl.handle.net/10657/4874.
MLA Handbook (7th Edition):
Bugosh, Greg. “Performance Studies of Multifunctional Pt/Pd Monolithic Catalysts for Hydrocarbon Oxidation Emission Control.” 2015. Web. 05 Mar 2021.
Vancouver:
Bugosh G. Performance Studies of Multifunctional Pt/Pd Monolithic Catalysts for Hydrocarbon Oxidation Emission Control. [Internet] [Doctoral dissertation]. University of Houston; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10657/4874.
Council of Science Editors:
Bugosh G. Performance Studies of Multifunctional Pt/Pd Monolithic Catalysts for Hydrocarbon Oxidation Emission Control. [Doctoral Dissertation]. University of Houston; 2015. Available from: http://hdl.handle.net/10657/4874
University of Cincinnati
5.
Madduma-Liyanage, Kumudu C.
Reactions of Pt(IV) and Pd(IV) Complexes with Multi-Electron
Substrates.
Degree: PhD, Arts and Sciences: Chemistry, 2014, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416570506
► Several square planar d8-electron metal complexes were prepared where the metal center is bonded to a bidentate ligand (L) that is capable of bonding to…
(more)
▼ Several square planar
d
8-
electron metal complexes were prepared
where the metal center is bonded to a bidentate ligand (L) that is
capable of bonding to metal centers in a tridentate, facially
coordinating geometry. The complexes undergo cooperative,
outer-sphere two-
electron transfer to give six-coordinate
d
6-
electron products in which L is
tridentate and the sixth coordination site is filled by a
solvent-available nucleophile (<i>e.g.</i>,)
Br
- or ;Cl;
-). A main
focus of this dissertation research was on the chemistry of the
electrochemically generated d
6-
electron
adducts in the presence of potential chemical substrates. These
studies indicate that the electrochemically generated
d
6-
electron metal complexes react
electrocatalytically with certain organic substrates
(<i>e.g.</i>,styrenes). In the best characterized
system, the accumulated evidence suggests that the
d
6-
electron complex is reduced back to the
d
8-
electron form by formally transferring a
Cl
+ ion to the substrate. A survey of a
large number of organic substrates suggests that substrate
selectivity is under thermodynamic control.In other words,
substrates with
oxidation potentials higher than those of the
d
6-
electron reagent are not activated,
whereas those with lower potentials are activated. In cases where a
square planar d
8-
electron metal complex was
used as the substrate, the product was confirmed to be a
six-coordinate d
6-
electron dichloro complex,
as expected for Cl
+ ion transfer. A detailed
analysis of product yields demonstrated that the system was
electrocatalytic. In a related study, reactions of a chemically
generated tribromo
platinum(IV) complex with styrenes were
investigated. Several products were identified and rationalized
based on a Br
+ ion transfer mechanism that
does not involve the conventional bromonium ion intermediate found
for reactions of olefins with bromine.
Advisors/Committee Members: Connick, William (Committee Chair).
Subjects/Keywords: Inorganic Chemistry; multi-electron transfer; electrocatalysis; chloro- transfer; palladium; platinum
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APA ·
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Manager
APA (6th Edition):
Madduma-Liyanage, K. C. (2014). Reactions of Pt(IV) and Pd(IV) Complexes with Multi-Electron
Substrates. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416570506
Chicago Manual of Style (16th Edition):
Madduma-Liyanage, Kumudu C. “Reactions of Pt(IV) and Pd(IV) Complexes with Multi-Electron
Substrates.” 2014. Doctoral Dissertation, University of Cincinnati. Accessed March 05, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416570506.
MLA Handbook (7th Edition):
Madduma-Liyanage, Kumudu C. “Reactions of Pt(IV) and Pd(IV) Complexes with Multi-Electron
Substrates.” 2014. Web. 05 Mar 2021.
Vancouver:
Madduma-Liyanage KC. Reactions of Pt(IV) and Pd(IV) Complexes with Multi-Electron
Substrates. [Internet] [Doctoral dissertation]. University of Cincinnati; 2014. [cited 2021 Mar 05].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416570506.
Council of Science Editors:
Madduma-Liyanage KC. Reactions of Pt(IV) and Pd(IV) Complexes with Multi-Electron
Substrates. [Doctoral Dissertation]. University of Cincinnati; 2014. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416570506
University of Alberta
6.
Khosravi Hafshejani, Milad.
An Investigation of a Pt-Pd Diesel Oxidation
Catalyst.
Degree: MS, Department of Chemical and Materials
Engineering, 2013, University of Alberta
URL: https://era.library.ualberta.ca/files/k643b220f
► Global kinetic model for a Pt-Pd diesel oxidation catalyst (DOC) is proposed and validated. Experimental data was obtained using different concentrations of the artificial gas…
(more)
▼ Global kinetic model for a Pt-Pd diesel oxidation
catalyst (DOC) is proposed and validated. Experimental data was
obtained using different concentrations of the artificial gas
mixtures which were passed over a bimetallic catalyst. Previous
works of Voltz [1], Pandya [2], Sola [3] and many others were used
to propose a new model, which was validated using a MATLAB based
solver and optimizer. A reasonable match between the experimental
data and predicted values was seen for all experimental conditions
except for the runs with CO, H2, C3H6 and NO. Some fundamental
observations were made in this case but further investigations are
necessary to improve the model.
Subjects/Keywords: Global Model; Modelling; Palladium; Diesel Oxidation Catalyst; Catalytic Converter; Platinum; Pt-Pd
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APA ·
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MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Khosravi Hafshejani, M. (2013). An Investigation of a Pt-Pd Diesel Oxidation
Catalyst. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/k643b220f
Chicago Manual of Style (16th Edition):
Khosravi Hafshejani, Milad. “An Investigation of a Pt-Pd Diesel Oxidation
Catalyst.” 2013. Masters Thesis, University of Alberta. Accessed March 05, 2021.
https://era.library.ualberta.ca/files/k643b220f.
MLA Handbook (7th Edition):
Khosravi Hafshejani, Milad. “An Investigation of a Pt-Pd Diesel Oxidation
Catalyst.” 2013. Web. 05 Mar 2021.
Vancouver:
Khosravi Hafshejani M. An Investigation of a Pt-Pd Diesel Oxidation
Catalyst. [Internet] [Masters thesis]. University of Alberta; 2013. [cited 2021 Mar 05].
Available from: https://era.library.ualberta.ca/files/k643b220f.
Council of Science Editors:
Khosravi Hafshejani M. An Investigation of a Pt-Pd Diesel Oxidation
Catalyst. [Masters Thesis]. University of Alberta; 2013. Available from: https://era.library.ualberta.ca/files/k643b220f
University of Michigan
7.
Whitfield, Salena Renice.
New Oxidation Reactions of Palladium and Platinum: Synthetic and Mechanistic Investigations.
Degree: PhD, Chemistry, 2008, University of Michigan
URL: http://hdl.handle.net/2027.42/60697
► Organic and inorganic oxidation reactions involving the metals palladium and platinum were developed. Palladium-catalyzed carbon-hydrogen (C-H) functionalization via acetoxylation was shown to proceed efficiently using…
(more)
▼ Organic and inorganic
oxidation reactions involving the metals
palladium and
platinum were developed.
Palladium-catalyzed carbon-hydrogen (C-H) functionalization via acetoxylation was shown to proceed efficiently using an oxidant immobilized on a solid support. The polymer oxidant has several advantages over a traditional monomer oxidant, including, but not limited to, cost, atom economy, and recyclability. Both sp2 and sp3 C-H bonds of small molecules were transformed using this methodology.
Palladium was also employed in stoichiometric
oxidation reactions.
Oxidation of PdII(phpy)2 (phpy = 2-phenylpyridine) using the electrophilic chlorinating reagents, PhICl2 and NCS, accessed the elusive high
oxidation state of PdIV. Novel complexes were identified and characterized, incorporating 2 chlorine ligands or 1 chlorine ligand and the succinimide ligand. Both complexes were shown to undergo facile reductive elimination to produce C-Cl, C-C, and even C-N coupled organic products. Other PdIV complexes were synthesized, examining the outcome of organic reductive elimination from a metal complex with two different ligands, acetate and chlorine. Initial results demonstrate that solvent and ligand position strongly influence the observed organic products.
Platinum complexes were also oxidized by the afore mentioned electrophilic chlorinating reagents. Using conditions from the
palladium system,
oxidation with PhICl2 afforded similar PtIV dichloride products, while
oxidation with NCS produced a PtIII complex as the major product. The reaction conditions were found to vary the observed ratios of products in the NCS oxidations. These factors were examined in an effort to propose a mechanism to explain formation of all of the species.
Finally,
platinum complexes were oxidized by a series of traditional and non-traditional oxidants to access PtIII and PtIV halogen and carboxylate complexes. Traditional oxidants included Br2 and I2, while non-traditional oxidants included XeF2, PhI(OAc)2 and PhI(C2F3O2)2. All of the compounds formed were stable to ambient conditions. Organic reductive elimination products were not observed in any of the thermolysis experiments. Upon heating the PtIV complexes either experienced no change or isomerized to an alternate geometry.
Advisors/Committee Members: Sanford, Melaine S. (committee member), Becker, Udo (committee member), Matzger, Adam J. (committee member), Wolfe, John P. (committee member).
Subjects/Keywords: Palladium and Platinum Oxidation; Chemistry; Science
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APA (6th Edition):
Whitfield, S. R. (2008). New Oxidation Reactions of Palladium and Platinum: Synthetic and Mechanistic Investigations. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/60697
Chicago Manual of Style (16th Edition):
Whitfield, Salena Renice. “New Oxidation Reactions of Palladium and Platinum: Synthetic and Mechanistic Investigations.” 2008. Doctoral Dissertation, University of Michigan. Accessed March 05, 2021.
http://hdl.handle.net/2027.42/60697.
MLA Handbook (7th Edition):
Whitfield, Salena Renice. “New Oxidation Reactions of Palladium and Platinum: Synthetic and Mechanistic Investigations.” 2008. Web. 05 Mar 2021.
Vancouver:
Whitfield SR. New Oxidation Reactions of Palladium and Platinum: Synthetic and Mechanistic Investigations. [Internet] [Doctoral dissertation]. University of Michigan; 2008. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2027.42/60697.
Council of Science Editors:
Whitfield SR. New Oxidation Reactions of Palladium and Platinum: Synthetic and Mechanistic Investigations. [Doctoral Dissertation]. University of Michigan; 2008. Available from: http://hdl.handle.net/2027.42/60697
University of South Carolina
8.
Banerjee, Ritubarna.
The Oxidation And Decoration Chemistry Of Platinum And Palladium Nanoparticles On Carbon Supports.
Degree: PhD, Chemical Engineering, 2016, University of South Carolina
URL: https://scholarcommons.sc.edu/etd/3949
► Ultrasmall platinum and palladium nanoparticles supported on carbon are used in a wide variety of industrial catalytic processes including hydrogenation-dehydrogenation reactions, isomerization of hydrocarbons,…
(more)
▼ Ultrasmall
platinum and
palladium nanoparticles supported on carbon are used in a wide variety of industrial catalytic processes including hydrogenation-dehydrogenation reactions, isomerization of hydrocarbons, ammonia and formic acid decomposition, the
oxidation of carbon monoxide, alcohols and ammonia, and fuel cells. This dissertation covers three aspects of the chemistry of these ultrasmall, carbon supported nanoparticles.
In the first vein of work, the oft-observed discrepancy in Pd nanoparticle size estimation between chemisorption and other methods such as STEM and XRD is explored. It is demonstrated that lower-than-expected chemisorption uptake can stem from not only residual chloride, but also from the decoration of the Pd surface by the carbon support itself. The degree of decoration decreases with graphitization of the carbon supports due to stronger C-C interaction, whereas increased density of oxygen functional groups on the surface increases decoration, due to enhanced Pd-C interactions. A combined synthesis and chemisorption protocol featuring chloride free precursors and a mild oxidative pretreatment prior to chemisorption is established to eliminate the size discrepancy.
In the second vein, the ambient
oxidation of ultra-small
platinum nanoparticles was explored with a combination of powder XRD performed with a high sensitivity solid state detector, and aberration corrected
electron microscopy with fast Fourier transform analysis. For the first time, the identity of the oxide phase is identified as Pt3O4, and the size window of
oxidation is accurately outlined: below 1.5 nm, nanoparticles exist only as oxides; from 1.5 to 2.5 nm, metallic and oxide phases occur, while above 2.5 nm, particles are completely metallic. Carbon supports of high microporosity give rise to large particle sizes at high metal loading, which stabilizes the particles against
oxidation.
In the last avenue of research, the application of Strong Electrostatic Adsorption for the synthesis of Pt nanoparticles was tested for specialty carbons: multi-walled nanotubes, nanofibers, graphene nanoplatelets, etc. These materials displayed volcano-shaped uptake curves typical of electrostatic adsorption for both Pt anions at low pH and Pt cations at high pH. However, the regimes of uptake often did not correspond to the measured point of zero charge (PZC). It was seen that the PZC of many of the carbons could be changed with washing, and so was likely affected by residual impurities of the manufacturing process. This renders the measured PZC of these specialty carbons unreliable for predicting anion and cation uptake. On the other hand, the anion and cation uptake curves provide an “effective” PZC and do indicate the optimal pH for the synthesis of ultrasmall nanoparticles.
Advisors/Committee Members: John R. Regalbuto.
Subjects/Keywords: Chemical Engineering; Engineering; Oxidation And Decoration Chemistry; Platinum And Palladium Nanoparticles; Carbon Supports
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APA (6th Edition):
Banerjee, R. (2016). The Oxidation And Decoration Chemistry Of Platinum And Palladium Nanoparticles On Carbon Supports. (Doctoral Dissertation). University of South Carolina. Retrieved from https://scholarcommons.sc.edu/etd/3949
Chicago Manual of Style (16th Edition):
Banerjee, Ritubarna. “The Oxidation And Decoration Chemistry Of Platinum And Palladium Nanoparticles On Carbon Supports.” 2016. Doctoral Dissertation, University of South Carolina. Accessed March 05, 2021.
https://scholarcommons.sc.edu/etd/3949.
MLA Handbook (7th Edition):
Banerjee, Ritubarna. “The Oxidation And Decoration Chemistry Of Platinum And Palladium Nanoparticles On Carbon Supports.” 2016. Web. 05 Mar 2021.
Vancouver:
Banerjee R. The Oxidation And Decoration Chemistry Of Platinum And Palladium Nanoparticles On Carbon Supports. [Internet] [Doctoral dissertation]. University of South Carolina; 2016. [cited 2021 Mar 05].
Available from: https://scholarcommons.sc.edu/etd/3949.
Council of Science Editors:
Banerjee R. The Oxidation And Decoration Chemistry Of Platinum And Palladium Nanoparticles On Carbon Supports. [Doctoral Dissertation]. University of South Carolina; 2016. Available from: https://scholarcommons.sc.edu/etd/3949
Michigan State University
9.
Dimos, Margaretta Mary.
Electrocatalytic oxidation of alcohols using platinum and palladium nanoporous solids.
Degree: 2011, Michigan State University
URL: http://etd.lib.msu.edu/islandora/object/etd:1229
► Thesis Ph. D. Michigan State University. Chemistry 2011.
As the world's supply of fossil fuels continues to diminish, there is an increasing need for the…
(more)
▼ Thesis Ph. D. Michigan State University. Chemistry 2011.
As the world's supply of fossil fuels continues to diminish, there is an increasing need for the development of alternative energy sources. Fuel cell technology, coupled with renewable, biomass-derived fuel stocks such as methanol and ethanol, is one such energy source that will find increasing use in both the near- and long-term future. The present generation of catalysts for fuel cells is characterized by limited efficiency and durability, and as such there is a great need to improve upon and develop new catalytic materials. Nanoporous solids, also known as inverse opals, are potentially useful materials, due in part to their relatively regular structure and physical integrity. It is the purpose of this work to initiate and investigation of nanoporous catalytic materials.We have developed nanoporous solids made from the electrodeposition of platinum and palladium metal around a silica nanosphere template. We used these materials to probe and interpret the catalysis of selected alcohols using cyclic voltammetry and chronoamperometry measurements. Initially we examined the electrocatalytic oxidation of methanol and ethanol, under acidic and basic conditions, using Pt and Pd nanoporous solid electrodes. Our results were then compared to planar Pt and Pd substrates, prepared using the same electrodeposition process as the nanoporous materials. The current density enhancement seen for the Pt nanoporous solids was more pronounced under basic conditions than acidic conditions. It was also determined that the nanoporous Pd was more catalytically active for ethanol than for methanol, with the nanoporous Pt producing higher catalytic efficiency for methanol. The enhancement that was observed with the nanoporous solids over their planar counterparts could be the result of either geometric factors or the catalyst surface morphology. The effect of morphology of the nanoporous Pt substrates was examined by studying the electrocatalytic oxidation of 1,2-propanediol under basic conditions. Our work was performed in alkaline media because, for this reactant, electrocatalytic oxidation is more efficient under these conditions. Our data for 1,2-propanediol point to metal morphology as the primary explanation for the enhanced current density relative to the planar solid electrode observed for the reaction with the nanoporous Pt.Our work with 1,2-propanediol proved to be informative, and we continued to examine the geometric vs. morphological enhancement issue by examining the electro-catalytic oxidation of 1,3-propanediol and four butanediols at nanoporous Pt and planar solid Pt electrodes under basic conditions. These reactants were chosen based on the positions of the hydroxyl moieties, so that the role of functional group position could be studied. The electro-catalysis of the aforementioned diols was studied both in terms of their reaction mechanism(s) and their kinetics. Our data indicate that the dominant factor in mediating the electrocatalytic oxidation pathway is the…
Advisors/Committee Members: Blanchard, Gary J, Bruening, Merlin L, Swain, Greg M, Weliky, David.
Subjects/Keywords: Biomass conversion; Fuel cells – Technological innovations; Oxidation; Electrocatalysis; Platinum; Palladium; Analytical chemistry; Nanoporous solids
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APA (6th Edition):
Dimos, M. M. (2011). Electrocatalytic oxidation of alcohols using platinum and palladium nanoporous solids. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:1229
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dimos, Margaretta Mary. “Electrocatalytic oxidation of alcohols using platinum and palladium nanoporous solids.” 2011. Thesis, Michigan State University. Accessed March 05, 2021.
http://etd.lib.msu.edu/islandora/object/etd:1229.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dimos, Margaretta Mary. “Electrocatalytic oxidation of alcohols using platinum and palladium nanoporous solids.” 2011. Web. 05 Mar 2021.
Vancouver:
Dimos MM. Electrocatalytic oxidation of alcohols using platinum and palladium nanoporous solids. [Internet] [Thesis]. Michigan State University; 2011. [cited 2021 Mar 05].
Available from: http://etd.lib.msu.edu/islandora/object/etd:1229.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dimos MM. Electrocatalytic oxidation of alcohols using platinum and palladium nanoporous solids. [Thesis]. Michigan State University; 2011. Available from: http://etd.lib.msu.edu/islandora/object/etd:1229
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Oulu
10.
Kärkkäinen, M.-L. (Marja-Liisa).
Deactivation of oxidation catalysts by sulphur and phosphorus in diesel and gas driven vehicles.
Degree: 2017, University of Oulu
URL: http://urn.fi/urn:isbn:9789526217239
► Abstract The combustion of fuels in motor vehicles is one of the most significant causes of air emissions. The use of oxidation catalysts in exhaust…
(more)
▼ Abstract
The combustion of fuels in motor vehicles is one of the most significant causes of air emissions. The use of oxidation catalysts in exhaust gas emission treatment can reduce hydrocarbons (HCs) and carbon monoxide (CO) emissions by more than 90%. Fuels and engine lubricants contain impurities like sulphur (S) and phosphorus (P), which can have a significant effect on the activity and durability of oxidation catalysts.
This thesis aims at increasing the current knowledge of the deactivation phenomena caused by sulphur and phosphorus in diesel and natural/bio gas oxidation catalysts. Accelerated laboratory scale sulphur, phosphorus and thermal treatments in gas-phase conditions were carried out for alumina (Al2O3) based platinum (Pt) and platinum-palladium (PtPd) metallic monolith diesel and natural gas oxidation catalysts. In addition, a vehicle-aged natural gas oxidation catalyst and an engine-bench-aged diesel oxidation catalyst were studied and used as a reference for the laboratory-scale-aged catalysts. BET-BJH, FESEM, TEM, XPS and DRIFT were used as characterization techniques to determine changes on the catalysts. The effect of accelerated deactivation treatments on the catalyst activity was determined using laboratory scale measurements in CO, HC and nitric oxide (NO) oxidation.
Sulphur and phosphorus were found to cause morphological and chemical changes on the studied catalysts. Sulphur was found to be adsorbed vertically throughout the entire catalyst support from the catalyst surface to the metallic monolith, while phosphorus accumulated on the surface region of the precious metal containing catalysts. Both, sulphur and phosphorus, slightly increased the average size of the precious metal particles size and are adsorbed onto the alumina by chemical bonds. In addition, a partial transformation from PdO to Pd and a change in the shape of the precious metal particles due to phosphorus were detected. Due to the detected structural and chemical changes on the catalysts, sulphur and phosphorus treatments reduced the catalytic activity of the studied diesel and natural-gas-oxidation catalysts. Correspondence between real and simulated ageing was found and thus the used accelerated laboratory scale aging method can be stated to be a good tool to simulate sulphur and phosphorus exposure.
Tiivistelmä
Moottoriajoneuvot ovat merkittäviä ilmapäästöjen aiheuttajia. Hapetuskatalyyttejä käyttämällä hiilimonoksidi- ja hiilivetypäästöistä pystytään poistamaan yli 90 %. Polttoaineet ja voiteluaineet sisältävät epäpuhtauksia kuten rikkiä ja fosforia, jotka voivat merkittävästi heikentää hapetuskatalyyttien aktiivisuutta ja kestävyyttä.
Väitöskirjan tavoitteena on tuottaa uutta tietoa rikin ja fosforin aiheuttamasta diesel- ja maakaasukatalyyttien deaktivoitumisesta. Metalliseen monoliittiin tuettuja alumiinioksidipohjaisia platina- ja palladiumkatalyytteja ikäytetiin tekemällä niille rikki-, fosfori- ja lämpökäsittelyjä. Maantieikäytettyä maakaasuhapetuskatalyyttiä ja moottoripenkki-ikäytettyä…
Advisors/Committee Members: Keiski, R. (Riitta), Huuhtanen, M. (Mika).
Subjects/Keywords: deactivation; diesel oxidation catalysts; methane; natural gas oxidation catalyst; palladium; phosphorus; platinum; poisoning; sulphur; deaktivoituminen; dieselhapetuskatalyytti; fosfori; maakaasuhapetuskatalyytti; metaani; myrkyttyminen; palladium; platina; rikki
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APA ·
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APA (6th Edition):
Kärkkäinen, M. -. (. (2017). Deactivation of oxidation catalysts by sulphur and phosphorus in diesel and gas driven vehicles. (Doctoral Dissertation). University of Oulu. Retrieved from http://urn.fi/urn:isbn:9789526217239
Chicago Manual of Style (16th Edition):
Kärkkäinen, M -L (Marja-Liisa). “Deactivation of oxidation catalysts by sulphur and phosphorus in diesel and gas driven vehicles.” 2017. Doctoral Dissertation, University of Oulu. Accessed March 05, 2021.
http://urn.fi/urn:isbn:9789526217239.
MLA Handbook (7th Edition):
Kärkkäinen, M -L (Marja-Liisa). “Deactivation of oxidation catalysts by sulphur and phosphorus in diesel and gas driven vehicles.” 2017. Web. 05 Mar 2021.
Vancouver:
Kärkkäinen M-(. Deactivation of oxidation catalysts by sulphur and phosphorus in diesel and gas driven vehicles. [Internet] [Doctoral dissertation]. University of Oulu; 2017. [cited 2021 Mar 05].
Available from: http://urn.fi/urn:isbn:9789526217239.
Council of Science Editors:
Kärkkäinen M-(. Deactivation of oxidation catalysts by sulphur and phosphorus in diesel and gas driven vehicles. [Doctoral Dissertation]. University of Oulu; 2017. Available from: http://urn.fi/urn:isbn:9789526217239
Michigan State University
11.
Krigas, Thomas Michael, 1939-.
An electron spin resonance study of radicals formed by high energy irradiation of K₂PdCl₄ and K₂PtCl₄.
Degree: PhD, Department of Chemistry, 1971, Michigan State University
URL: http://etd.lib.msu.edu/islandora/object/etd:25125
Subjects/Keywords: Platinum compounds – Spectra; Palladium compounds – Spectra; Electron paramagnetic resonance
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APA (6th Edition):
Krigas, Thomas Michael, 1. (1971). An electron spin resonance study of radicals formed by high energy irradiation of K₂PdCl₄ and K₂PtCl₄. (Doctoral Dissertation). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:25125
Chicago Manual of Style (16th Edition):
Krigas, Thomas Michael, 1939-. “An electron spin resonance study of radicals formed by high energy irradiation of K₂PdCl₄ and K₂PtCl₄.” 1971. Doctoral Dissertation, Michigan State University. Accessed March 05, 2021.
http://etd.lib.msu.edu/islandora/object/etd:25125.
MLA Handbook (7th Edition):
Krigas, Thomas Michael, 1939-. “An electron spin resonance study of radicals formed by high energy irradiation of K₂PdCl₄ and K₂PtCl₄.” 1971. Web. 05 Mar 2021.
Vancouver:
Krigas, Thomas Michael 1. An electron spin resonance study of radicals formed by high energy irradiation of K₂PdCl₄ and K₂PtCl₄. [Internet] [Doctoral dissertation]. Michigan State University; 1971. [cited 2021 Mar 05].
Available from: http://etd.lib.msu.edu/islandora/object/etd:25125.
Council of Science Editors:
Krigas, Thomas Michael 1. An electron spin resonance study of radicals formed by high energy irradiation of K₂PdCl₄ and K₂PtCl₄. [Doctoral Dissertation]. Michigan State University; 1971. Available from: http://etd.lib.msu.edu/islandora/object/etd:25125
University of Cincinnati
12.
Chatterjee, Sayandev.
Cooperative Two-Electron Reagents of Lower Transition Metals
of Group 10.
Degree: PhD, Arts and Sciences : Chemistry, 2009, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250266435
► Increase in worldwide fossil fuel consumption and environmental concerns aremotivating efforts to develop efficient multi-electron catalysts for energetically orkinetically unfavorable reactions. Examples include splitting water…
(more)
▼ Increase in worldwide fossil fuel consumption and
environmental concerns aremotivating efforts to develop efficient
multi-
electron catalysts for energetically orkinetically
unfavorable reactions. Examples include splitting water to make
oxygen andhydrogen fuel and fixing carbon dioxide produced in
combustion processes. Squareplanar d
8- and
octahedral d
6-
electron complexes of
2
nd and 3
rd row of
Group 10 are attractive candidates for catalysis, as they undergo
cooperative two
electron changes in
oxidation states. The
cooperativity arises from the stability of the
d
6- and d
8-
electron
configurations with respect to the intermediate
d
7, causing an inversion of the
one-
electron
reduction potentials:
E
1°′(d
6/d
7)<E
2°′(d
7/d
8).
Fine control over these redox potentials and rates represents a
powerful strategy for improving and designing new catalysts.
However, attempts to implement this strategy are hampered by the
fact that the redox reactions involve drastic changes in molecular
geometry, making them irreversible. To address this problem, this
work is focused on designing metal complexes with ligand
architectures capable stabilizing four-coordinate geometry favored
by the d
8-
electron configuration and
six-coordinate geometry favored by the
d
6-
electron configuration. In certain
instances, these ligand scaffolds allow for facile two-
electron
transfer and measurement of the two-
electron redox couple. This
dissertation reports the synthesis of two new classes of
palladium
andplatinum complexes with ligand architectures capable of
supporting outer-sphere two
electron transfer. The first class
includes complexes with a combination of monodentate, bidentate and
pincer ligands. In these systems, the pincer ligand is capable of
interconverting between a monodentate coordination mode and a
meridional coordination mode, thus allowing for interconversion.
Electrochemical studies demonstrate that these complexes are
capable of undergoing two-
electron transfer. The reactions show a
wide variation in the redox potentials, chemical reversibility, and
electron-transfer kinetics that can be rationalized in terms of the
electronic, steric and conformational properties of the ligands, as
also the electronic properties of the metal.
One critical discovery
is that the metal can act as both a Brønsted base and Lewis acid.
Accumulated data suggest that the Lewis acid behavior causes
preorganization of the d
8-
electron complex
and is therefore a crucial element in the cooperative two-
electron
reactivity. The second category of complexes is composed of a
bidentate ligand and apotentially facially coordinating tripodal
ligand. In the presence of nucleophiles, thesesystems undergo
remarkably reversible outer-sphere two-
electron transfer.
Mechanisticstudies indicate interconversion between four- and
six-coordinate geometries, in whichthe nucleophile bonds at an open
axial site.…
Advisors/Committee Members: Connick, William (Committee Chair).
Subjects/Keywords: Chemistry; redox; electron transfer; platinum; palladium; complexes
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APA (6th Edition):
Chatterjee, S. (2009). Cooperative Two-Electron Reagents of Lower Transition Metals
of Group 10. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250266435
Chicago Manual of Style (16th Edition):
Chatterjee, Sayandev. “Cooperative Two-Electron Reagents of Lower Transition Metals
of Group 10.” 2009. Doctoral Dissertation, University of Cincinnati. Accessed March 05, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250266435.
MLA Handbook (7th Edition):
Chatterjee, Sayandev. “Cooperative Two-Electron Reagents of Lower Transition Metals
of Group 10.” 2009. Web. 05 Mar 2021.
Vancouver:
Chatterjee S. Cooperative Two-Electron Reagents of Lower Transition Metals
of Group 10. [Internet] [Doctoral dissertation]. University of Cincinnati; 2009. [cited 2021 Mar 05].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250266435.
Council of Science Editors:
Chatterjee S. Cooperative Two-Electron Reagents of Lower Transition Metals
of Group 10. [Doctoral Dissertation]. University of Cincinnati; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250266435
13.
Holade, Yaovi.
Transformation électrocatalytique de sucres couplée à la réduction enzymatique de l'oxygène moléculaire pour la production d'énergie : Electrocatalytique transformation of carbohydrates combined with enzymatic molecular dioxygen reduction for sustainable energy production.
Degree: Docteur es, Chimie théorique, physique, analytique, 2015, Poitiers
URL: http://www.theses.fr/2015POIT2262
► Le développement de générateurs d'énergie pour alimenter des micro-appareils électroniques implantés est devenu une option inéluctable. L'objectif général qui a orienté ces recherches était l'élaboration…
(more)
▼ Le développement de générateurs d'énergie pour alimenter des micro-appareils électroniques implantés est devenu une option inéluctable. L'objectif général qui a orienté ces recherches était l'élaboration et les études approfondies des propriétés nanomatériaux métalliques utilisables comme électrocatalyseurs afin de convertir l'énergie chimique en énergie électrique. Les nanomatériaux sont obtenus par la méthode de synthèse : Bromide Anion Exchange (BAE) qui a été scrupuleusement revisitée puis optimisée avec un agent réducteur faible (AA) et fort (NaBH4). Cette voie de synthèse a permis d'obtenir (rendement ≥ 90 %) des matériaux plurimétalliques composés d'or, de platine et de palladium. Un prétraitement des supports commerciaux des nanoparticules a permis d’augmenter leurs surfaces, spécifique et active respectivement de 48 et 120 %. Les études (électro)analytiques ont permis d'identifier les intermédiaires et produits de réaction du combustible. Le glucose s'oxyde sans rupture de la liaison C-C pour donner majoritairement du gluconate avec une sélectivité ≥ 88 %. Les tests réalisés en biopile hybride (cathode enzymatique) indiquent que les catalyseurs Au/C-AA et Au60Pt40/C-NaBH4 sont les meilleures anodes abiotiques (Pmax = 125 µW·cm-2 à 0,4 V). Par ailleurs, les piles sans membrane séparatrice et sans enzyme ont été réalisées avec succès pour activer un stimulateur cardiaque et un système de transmission d'information en mode "Wifi". Ces dispositifs, rapportés pour la première fois, ouvrent une ère nouvelle pour la conception de convertisseurs d'énergie pour alimenter les implants médicaux ou des appareils sans fil de détection et de surveillance.
The development of energy converters to power implanted micro-electronic devices has become a cornerstone item. The whole target which has governed this research was the design of advanced nanostructures metals used as electrocatalysts for converting chemical energy into electrical one. These nanomaterials were obtained by the synthesis method: Bromide Anion Exchange (BAE) that has been carefully revisited and optimized, using a weak reducing agent (AA) and strong one (NaBH4). It allowed to prepare efficiently various plurimetallic nanomaterials composed of gold, platinum and palladium (yield ≥ 90%). A thermal pretreatment of commercial carbon supports of nanoparticles has highly boosted their specific and active surface areas with a gain of 48 and 120%. Based on in situ and ex-situ (electro)analytical methods, the intermediates and final reaction products of the fuel oxidation were identified. Glucose electrooxidation occurs without C-C bond cleavage and gives predominantly gluconate with a selectivity ≥ 88 %. Results from the hybrid biofuel cell tests (with an enzyme as cathode catalyst) indicate that Au/C-AA and Au60Pt40/C-NaBH4 are the best abiotic anodes (Pmax = 125 µW cm-2 at 0.4 V cell voltage). A fuel cell without separating membrane and enzyme has been successfully constructed and used to activate a pacemaker and an information transmission system based on…
Advisors/Committee Members: Kokoh, Kouakou Boniface (thesis director), Servat, Karine (thesis director).
Subjects/Keywords: Nanoparticule; Électrochimie; Électrocatalyse; Glucose; Or; Platine; Palladium; Oxydation; Électrooxydation; Biopile implantable; Stimulateur cardiaque; Nanoparticle; Electrochemistry; Electrocatalysis; Glucose; Gold; Platinum; Palladium; Oxidation; Electrooxidation; Implantable biofuel cell; Pacemaker; 541.37
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APA ·
Chicago ·
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APA (6th Edition):
Holade, Y. (2015). Transformation électrocatalytique de sucres couplée à la réduction enzymatique de l'oxygène moléculaire pour la production d'énergie : Electrocatalytique transformation of carbohydrates combined with enzymatic molecular dioxygen reduction for sustainable energy production. (Doctoral Dissertation). Poitiers. Retrieved from http://www.theses.fr/2015POIT2262
Chicago Manual of Style (16th Edition):
Holade, Yaovi. “Transformation électrocatalytique de sucres couplée à la réduction enzymatique de l'oxygène moléculaire pour la production d'énergie : Electrocatalytique transformation of carbohydrates combined with enzymatic molecular dioxygen reduction for sustainable energy production.” 2015. Doctoral Dissertation, Poitiers. Accessed March 05, 2021.
http://www.theses.fr/2015POIT2262.
MLA Handbook (7th Edition):
Holade, Yaovi. “Transformation électrocatalytique de sucres couplée à la réduction enzymatique de l'oxygène moléculaire pour la production d'énergie : Electrocatalytique transformation of carbohydrates combined with enzymatic molecular dioxygen reduction for sustainable energy production.” 2015. Web. 05 Mar 2021.
Vancouver:
Holade Y. Transformation électrocatalytique de sucres couplée à la réduction enzymatique de l'oxygène moléculaire pour la production d'énergie : Electrocatalytique transformation of carbohydrates combined with enzymatic molecular dioxygen reduction for sustainable energy production. [Internet] [Doctoral dissertation]. Poitiers; 2015. [cited 2021 Mar 05].
Available from: http://www.theses.fr/2015POIT2262.
Council of Science Editors:
Holade Y. Transformation électrocatalytique de sucres couplée à la réduction enzymatique de l'oxygène moléculaire pour la production d'énergie : Electrocatalytique transformation of carbohydrates combined with enzymatic molecular dioxygen reduction for sustainable energy production. [Doctoral Dissertation]. Poitiers; 2015. Available from: http://www.theses.fr/2015POIT2262
University of Missouri – Kansas City
14.
Mwaipopo, Charles Andengenie.
Mineral ecology and network analysis of chromium, platinum, gold and palladium.
Degree: 2020, University of Missouri – Kansas City
URL: http://hdl.handle.net/10355/75790
► Data collected on the location of mineral species and related minerals from the field have many great uses from mineral exploration to mineral analysis. Such…
(more)
▼ Data collected on the location of mineral species and related minerals from the field have many great uses from mineral exploration to mineral analysis. Such data is useful for further exploration and discovery of other minerals as well as exploring relationships that were not as obvious even to a trained mineralogist.
Two fields of mineral analysis are examined in the paper, namely mineral ecology and mineral network analysis through mineral co-existence. Mineral ecology explores spatial distribution and diversity of the earth’s minerals. Mineral network analysis uses mathematical functions to visualize and graph mineral relationships. Several functions such as the finite Zipf-Mandelbrot (fZM), chord diagrams and mineral network diagrams, processed data and provided information on the estimation of minerals at different localities and interrelationships between chromium,
platinum, gold and
palladium-bearing minerals. The results obtained are important in highlighting several connections that could prove useful in mineral exploration.
The main objective of the study is to provide any insight into the relationship among chromium,
platinum,
palladium and gold that could prove useful in mapping out potential locations of either mineral in the future. With more open data repositories available, more research could be done to further highlight the importance of mineral ecology and network analysis in mineral exploration. Such a research is important in paving the way for data driven discovery on the field of geology by making use of the vast amount of data currently available. Mineral ecology and network analysis currently face a hindrance, because of more crucial data being held for proprietary reasons that tend to profit from its exclusivity.
Advisors/Committee Members: Graettinger, Alison H. (advisor).
Subjects/Keywords: Chromium – Analysis; Platinum – Analysis; Gold – Analysis; Palladium – Analysis; Thesis – University of Missouri – Kansas City – Geosciences
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APA (6th Edition):
Mwaipopo, C. A. (2020). Mineral ecology and network analysis of chromium, platinum, gold and palladium. (Thesis). University of Missouri – Kansas City. Retrieved from http://hdl.handle.net/10355/75790
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mwaipopo, Charles Andengenie. “Mineral ecology and network analysis of chromium, platinum, gold and palladium.” 2020. Thesis, University of Missouri – Kansas City. Accessed March 05, 2021.
http://hdl.handle.net/10355/75790.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mwaipopo, Charles Andengenie. “Mineral ecology and network analysis of chromium, platinum, gold and palladium.” 2020. Web. 05 Mar 2021.
Vancouver:
Mwaipopo CA. Mineral ecology and network analysis of chromium, platinum, gold and palladium. [Internet] [Thesis]. University of Missouri – Kansas City; 2020. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10355/75790.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mwaipopo CA. Mineral ecology and network analysis of chromium, platinum, gold and palladium. [Thesis]. University of Missouri – Kansas City; 2020. Available from: http://hdl.handle.net/10355/75790
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Michigan
15.
Wiswall, James T.
Catalysis of Propane Oxidation and Premixed Propane-Air Flames.
Degree: PhD, Mechanical Engineering, 2009, University of Michigan
URL: http://hdl.handle.net/2027.42/64735
► Improvements in deriving energy from hydrocarbon fuels will have a large impact on our efforts to transition to sustainable and renewable energy resources. The hypothesis…
(more)
▼ Improvements in deriving energy from hydrocarbon fuels will have a large impact on our efforts to transition to sustainable and renewable energy resources. The hypothesis is that catalysis can extend the useful operating conditions for hydrocarbon
oxidation and combustion, improve device efficiencies, and reduce pollutants. Catalysis of propane
oxidation and premixed propane-air flames are examined experimentally, using a stagnation-flow reactor to identify the important physical and chemical mechanisms over a range of flow, catalyst, and temperature conditions.
The propane
oxidation studies consider five catalyst materials:
platinum,
palladium, SnO2, 90% SnO2 – 10% Pt (by mass), and quartz. The volume fractions of CO2, O2, C3H8, CO, NO and the electric power required to control the catalyst temperature quantify the activity of each catalyst for the equivalence ratios of 0.67, 1.00, and 1.50, and over the catalyst temperature range 23-800 °C. Quartz is used as a baseline and confirmed to be non-reactive at all conditions. 100% SnO2 has minimal reactivity.
Platinum,
palladium, and 90% SnO2 – 10% Pt show similar trends and have the highest catalytic activity for the fuel rich mixture.
Palladium and 90% SnO2 – 10% Pt show an increasing catalyst-activation temperature (Tsa) for decreasing equivalence ratio, and
platinum shows an approximately constant catalyst-activation temperature for decreasing equivalence ratio (Tsa = 310 °C). Of these the 90% SnO2 – 10% Pt catalyst shows the lowest Tsa, occurring for the fuel-rich mixture (Tsa = 250 °C).
The studies of premixed propane-air flames consider
platinum and quartz stagnation surfaces for fuel-mixture velocities from 0.6-1.6 m/s. Five flame structures are observed: cool core envelope, cone, envelope, disk, and ring flames. The lean-extinction limit, disk-to-ring flame transition mixture, and the disk-flame to stagnation-plane distance are reported.
Platinum inhibits the ring flame structure. The lean-extinction limit and disk-flame to stagnation-plane separation distance are insensitive to the stagnation-plane material.
The results set directions for development of improved catalyst systems, including the development of lean NOx catalysts with low light-off temperatures, methods to quantify catalyst aging and poisoning properties, and fundamental data to develop models of the catalyst chemistry for the design of novel energy generation techniques.
Advisors/Committee Members: Im, Hong G. (committee member), Wooldridge, Margaret S. (committee member), Atreya, Arvind (committee member), Ihme, Matthias (committee member).
Subjects/Keywords: Catalytic Combustion; Platinum; Palladium; Tin Dioxide; Propane Oxidation; Catalytic Oxidation; Mechanical Engineering; Engineering
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APA ·
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APA (6th Edition):
Wiswall, J. T. (2009). Catalysis of Propane Oxidation and Premixed Propane-Air Flames. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/64735
Chicago Manual of Style (16th Edition):
Wiswall, James T. “Catalysis of Propane Oxidation and Premixed Propane-Air Flames.” 2009. Doctoral Dissertation, University of Michigan. Accessed March 05, 2021.
http://hdl.handle.net/2027.42/64735.
MLA Handbook (7th Edition):
Wiswall, James T. “Catalysis of Propane Oxidation and Premixed Propane-Air Flames.” 2009. Web. 05 Mar 2021.
Vancouver:
Wiswall JT. Catalysis of Propane Oxidation and Premixed Propane-Air Flames. [Internet] [Doctoral dissertation]. University of Michigan; 2009. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2027.42/64735.
Council of Science Editors:
Wiswall JT. Catalysis of Propane Oxidation and Premixed Propane-Air Flames. [Doctoral Dissertation]. University of Michigan; 2009. Available from: http://hdl.handle.net/2027.42/64735
Texas A&M University
16.
Gath, Kerrie K.
X-ray Photoelectron Spectroscopy and Kinetic Study: Pt-Group Metals and Bimetallic Surfaces.
Degree: PhD, Chemistry, 2010, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-211
► Pt-group metals were some of the first metals to be studied as catalysts for industrial use. The goal of these studies was to ascertain a…
(more)
▼ Pt-group metals were some of the first metals to be studied as catalysts
for industrial use. The goal of these studies was to ascertain a fundamental
understanding of CO
oxidation and acetylene cyclotrimerization reactions on Ptgroup
metals. A further goal was to determine the optimal conditions for each
reaction.
CO
oxidation on Rh(111),Pt(100), and Pd(100) was scrutinized on various
oxide surfaces from chemisorbed to bulk metal oxides. Low pressure reactions
on Rh(111) reveal the highest activity was a CO uninhibited surface with <1ML of
chemisorbed oxygen. Pt(100) high pressure
oxidation revealed that only <1ML
oxygen is formed during high pressures reactions. High pressure CO
oxidation
reactions on Pd(100) show oxygen penetration after CO has been consumed;
however, during the highest activity XPS found only chemisorbed species.
The cyclotrimerization of acetylene to benzene is another reaction found
in industry typically carried out on Pd. The active site is considered to be a 7 atom configuration with 6 atoms surrounding a central atom. By adding
relatively catalytically inert Au atoms to the active Pd(111) surface the acetylene
coupling activity is enhanced. Cyclization activity is a function of the surface
composition and the surface structure. A single Pd atom surrounded by six Au
atoms is found to have the highest activity at 300K for acetylene
cyclotrimerization.
Advisors/Committee Members: Goodman, D. Wayne (advisor), Darensbourg, Marcetta (committee member), Rosynek, Michael (committee member), El-Halwagi, Mahmoud (committee member).
Subjects/Keywords: Surface Science; bimetallic; CO oxidation; acetylene; benzene; Palladium; Rhodium; Platinum
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APA ·
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CSE |
Export
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APA (6th Edition):
Gath, K. K. (2010). X-ray Photoelectron Spectroscopy and Kinetic Study: Pt-Group Metals and Bimetallic Surfaces. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-211
Chicago Manual of Style (16th Edition):
Gath, Kerrie K. “X-ray Photoelectron Spectroscopy and Kinetic Study: Pt-Group Metals and Bimetallic Surfaces.” 2010. Doctoral Dissertation, Texas A&M University. Accessed March 05, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-211.
MLA Handbook (7th Edition):
Gath, Kerrie K. “X-ray Photoelectron Spectroscopy and Kinetic Study: Pt-Group Metals and Bimetallic Surfaces.” 2010. Web. 05 Mar 2021.
Vancouver:
Gath KK. X-ray Photoelectron Spectroscopy and Kinetic Study: Pt-Group Metals and Bimetallic Surfaces. [Internet] [Doctoral dissertation]. Texas A&M University; 2010. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-211.
Council of Science Editors:
Gath KK. X-ray Photoelectron Spectroscopy and Kinetic Study: Pt-Group Metals and Bimetallic Surfaces. [Doctoral Dissertation]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-211
17.
Bampos, Georgios.
Ανάπτυξη διμεταλλικών ηλεκτροκαταλυτών για εφαρμογή σε στοιχεία καυσίμου χαμηλής θερμοκρασίας.
Degree: 2020, University of Patras; Πανεπιστήμιο Πατρών
URL: http://hdl.handle.net/10442/hedi/48609
► Bimetallic electrocatalysts were studied towards the electrochemical oxygen reduction reaction (ORR) and the electrochemical hydrogen oxidation reaction (HOR) in acidic and alkaline environment mainly applying…
(more)
▼ Bimetallic electrocatalysts were studied towards the electrochemical oxygen reduction reaction (ORR) and the electrochemical hydrogen oxidation reaction (HOR) in acidic and alkaline environment mainly applying the rotating disk electrode (RDE) technique using a thin electrocatalytic film. Carbon black (Vulcan XC72R) supported Pd based bimetallic electrocatalysts 7.5 wt.% Pd – 2.5 wt.% M prepared via the wet impregnation method and reduced at 300 °C at H2 flow were tested towards their ORR and HOR activity in 0.1M HClO4 and 0.1M KOH. The aforementioned electrocatalysts were also examined as it concerns their physicochemical characteristic applying BET, XRD, TEM, SEM and XPS. Pt-based electrocatalysts with the same metal loading were also tested as reference materials. Pd-based electrocatalysts with higher metal loading (29 wt.%) applying the optimum reduction temperature and the optimum Pd:M ratio for which the activity towards the aforementioned reaction was maximized was compared with the performance of Pt-based electrocatalysts with the same metal loading. The electrocatalysts with 29 wt.% metal loading were also tested towards their stability. In the case of ORR in acidic medium the effect of the synthesis method as well as the carrier on the activity was also tested. Moreover, the activity of carbon black supported 10 wt.% Pt-M (M:Ag, Cu, Fe, Ni, Sn, Zn) towards the ORR in acidic medium in the presence and absence of EtOH was tested. Finally, the most active towards the ORR bimetallic 22 wt.% Pd – 7 wt.% Zn/C electrocatalyst was studied as cathodic electrode in a H2-fuelled PEMFC. The performance of the latter was compared with the activity of Pt-based electrocatalysts which were also used as cathodic materials.
Στην παρούσα εργασία έγινε μελέτη νέων διμεταλλικών ηλεκτροκαταλυτών για την ηλεκτροχημική αντίδραση της αναγωγής του Ο2 (Oxygen reduction reaction, ORR) και την ηλεκτροχημική αντίδραση της οξείδωσης του Η2 (Hydrogen oxidation reaction, HOR) σε όξινο και αλκαλικό περιβάλλον, η οποία πραγματοποιήθηκε κύρια με την τεχνική του ηλεκτροδίου περιστρεφόμενου δίσκου με τον ηλεκτροκαταλύτη ως εναπόθεμα μικρού πάχους (thin-film rotating electrode technique, RDE). Πιο συγκεκριμένα, μελετήθηκε η δραστικότητα ως προς ORR, τόσο σε διάλυμα 0.1M HClO4 όσο και σε διάλυμα 0.1Μ ΚΟΗ, βασισμένων σε Pd διμεταλλικών ηλεκτροκαταλυτών 7.5 wt.% Pd – 2.5 wt.% M στηριγμένων σε αγώγιμο άνθρακα (Vulcan XC72R) οι οποίοι παρασκευάστηκαν κύρια με τη μέθοδο του υγρού εμποτισμού και υπέστησαν αναγωγή υπό ροή Η2 στους 300 °C. Οι ηλεκτροκαταλύτες αυτοί μελετήθηκαν επίσης όσον αφορά στη δραστικότητά τους ως προς ΗΟR σε διάλυμα 0.1Μ HClO4 αλλά και σε διάλυμα 0.1Μ ΚΟΗ. Οι ηλεκτροκαταλυτικές σκόνες χαρακτηρίστηκαν φυσικοχημικά με φυσική ρόφηση (ΒΕΤ), XRD, TEM, SEM και XPS. Σε όλες τις περιπτώσεις, έγινε σύγκριση της δραστικότητας των βασισμένων σε Pd ηλεκτροκαταλυτών με εκείνη ηλεκτροκαταλυτών Pt ίδιας συνολικής μεταλλικής φόρτισης. Η αναλογία Pd:M και η θερμοκρασία αναγωγής που χρησιμοποιήθηκαν ήταν οι βέλτιστες από άποψη δραστικότητας,…
Subjects/Keywords: Διμεταλλικοί ηλεκτροκαταλύτες; Αναγωγή του οξυγόνου; Οξείδωση του υδρογόνου; Χαμηλής θερμοκρασίας στοιχεία καυσίμου; Παλλάδιο, Λευκόχρυσος; Bimetallic electrocatalysts; Oxygen reduction reaction; Hydrogen oxidation reaction; Low-temperature fuel cells; Palladium, Platinum
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APA ·
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APA (6th Edition):
Bampos, G. (2020). Ανάπτυξη διμεταλλικών ηλεκτροκαταλυτών για εφαρμογή σε στοιχεία καυσίμου χαμηλής θερμοκρασίας. (Thesis). University of Patras; Πανεπιστήμιο Πατρών. Retrieved from http://hdl.handle.net/10442/hedi/48609
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bampos, Georgios. “Ανάπτυξη διμεταλλικών ηλεκτροκαταλυτών για εφαρμογή σε στοιχεία καυσίμου χαμηλής θερμοκρασίας.” 2020. Thesis, University of Patras; Πανεπιστήμιο Πατρών. Accessed March 05, 2021.
http://hdl.handle.net/10442/hedi/48609.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bampos, Georgios. “Ανάπτυξη διμεταλλικών ηλεκτροκαταλυτών για εφαρμογή σε στοιχεία καυσίμου χαμηλής θερμοκρασίας.” 2020. Web. 05 Mar 2021.
Vancouver:
Bampos G. Ανάπτυξη διμεταλλικών ηλεκτροκαταλυτών για εφαρμογή σε στοιχεία καυσίμου χαμηλής θερμοκρασίας. [Internet] [Thesis]. University of Patras; Πανεπιστήμιο Πατρών; 2020. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10442/hedi/48609.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bampos G. Ανάπτυξη διμεταλλικών ηλεκτροκαταλυτών για εφαρμογή σε στοιχεία καυσίμου χαμηλής θερμοκρασίας. [Thesis]. University of Patras; Πανεπιστήμιο Πατρών; 2020. Available from: http://hdl.handle.net/10442/hedi/48609
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Pretoria
18.
[No author].
Synthesis and testing of palladium and platinum
phosphine complexes with potential mitochondrial targeting
anti-cancer properties
.
Degree: 2009, University of Pretoria
URL: http://upetd.up.ac.za/thesis/available/etd-09232009-171302/
► The main theme of this thesis focuses on the preparation of palladium and platinum phosphine complexes that possess the potential to act as anti-cancer agents.…
(more)
▼ The main theme of this thesis focuses on the
preparation of
palladium and
platinum phosphine complexes that
possess the potential to act as anti-cancer agents. The design of
the complexes was based on the known compound, [Au(dppe)2]Cl which
was shown to have an anti-mitochondrial mode of action on cancer
cells. Major problems were experienced in the synthesis of these
novel
palladium and
platinum compounds as the five phosphine
ligands required diverse reaction conditions. Instability was the
major hindrance as decomposition occurred during purification. This
led to the substitution of the counter-ion (Cl-) with PF6-. The
complexes prepared in this study were varied in lipophilicity as
the gold complex was found to be non-selective due to high
lipophilicity. In total, six compounds were prepared, purified and
tested for potency against a panel of cancer cell lines as well as
normal cells. The most lipophilic compound, [Au(dppe)2]Cl, was
non-selective as it exhibited the highest toxicity to both
cancerous and normal cells. In general, in vitro studies showed
that
palladium complexes were more toxic than the
platinum
analogues. These novel compounds were also non-toxic to both
resting and stimulated lymphocytes signifying high selectivity for
cancer cells. Three compounds, Pg 3, Pg 4a and Pg 8 exhibited high
toxicity and were hence tested as such on murine cancer cell lines.
Pg 8, with intermediate lipophilicity, showed toxicity against a
larger number of cancer cell lines and this led to further
investigations in an attempt to determine its mode of action.
Analysis of the effects of Pg 8 on the mitochodria showed that it
did not depolarise the mitochondrial membrane potential. A seven
day analysis showed that while it did not have any effect on the
mitochondrial membrane potential, it depolarised the plasma
membrane potential from day 4. In contrast, [Au(dppe)2]Cl
depolarised the mitochondrial membrane potential as expected. Pg 8
was shown to induce apoptosis and necrosis on Jurkat cells after
exposure for 48 h. It was also shown to induce cell cycle arrest
(after 48 h) as it caused blockade in the S-phase. In contrast,
[Au(dppe)2]Cl caused a blockade in the G0/G1 phase. Uptake studies
with radiolabelled Pg 8, [103Pd(d2pyrpe)2][PF6]2, showed that it
accumulated significantly in Jurkat cells. Biodistribution studies
in Wistar rats demonstrated that it was mostly taken up in the
spleen followed by the liver. However, it was excreted faster than
[198Au(dppe)2]Cl as this latter compound accumulated significantly
in the lungs followed by the spleen, small intestine and liver.
Acute toxicity studies in Balb/c mice showed that Pg 8 was less
toxic than [Au(dppe)2]Cl. The latter compound (at 3 and 6 ìM)
caused a significant reduction of total body weight over a 5-day
period. Toxicity was evident as it was also shown to cause
elevation of liver enzymes (AST and GGT), contrary to the results
obtained from the mice treated with Pg 8 (at 3, 6, 12 and 15 ìM).
Preparation of a patent for the synthesis as well as anti-cancer…
Advisors/Committee Members: Prof C E Medlen (advisor), Prof S Lotz (advisor).
Subjects/Keywords: Palladium;
Platinum phosphine complexes;
Anti-cancer;
UCTD
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APA (6th Edition):
author], [. (2009). Synthesis and testing of palladium and platinum
phosphine complexes with potential mitochondrial targeting
anti-cancer properties
. (Doctoral Dissertation). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-09232009-171302/
Chicago Manual of Style (16th Edition):
author], [No. “Synthesis and testing of palladium and platinum
phosphine complexes with potential mitochondrial targeting
anti-cancer properties
.” 2009. Doctoral Dissertation, University of Pretoria. Accessed March 05, 2021.
http://upetd.up.ac.za/thesis/available/etd-09232009-171302/.
MLA Handbook (7th Edition):
author], [No. “Synthesis and testing of palladium and platinum
phosphine complexes with potential mitochondrial targeting
anti-cancer properties
.” 2009. Web. 05 Mar 2021.
Vancouver:
author] [. Synthesis and testing of palladium and platinum
phosphine complexes with potential mitochondrial targeting
anti-cancer properties
. [Internet] [Doctoral dissertation]. University of Pretoria; 2009. [cited 2021 Mar 05].
Available from: http://upetd.up.ac.za/thesis/available/etd-09232009-171302/.
Council of Science Editors:
author] [. Synthesis and testing of palladium and platinum
phosphine complexes with potential mitochondrial targeting
anti-cancer properties
. [Doctoral Dissertation]. University of Pretoria; 2009. Available from: http://upetd.up.ac.za/thesis/available/etd-09232009-171302/
University of California – San Diego
19.
Barnett, Brandon Richard.
Platinum and Palladium Isocyanides as Platforms on which to Study Metal/Lewis Acid Cooperativity and Ligand-based Redox-Noninnocence.
Degree: Chemistry, 2016, University of California – San Diego
URL: http://www.escholarship.org/uc/item/06j1q941
► This dissertation describes various investigations into the reactivity and electronic structure of platinum and palladium complexes supported by m-terphenyl isocyanides. Use of these encumbering ligands…
(more)
▼ This dissertation describes various investigations into the reactivity and electronic structure of platinum and palladium complexes supported by m-terphenyl isocyanides. Use of these encumbering ligands facilitated the formation of two-coordinate Pt(CNArDipp2)2, which serves an isolable mimic of the unstable carbonyl Pt(CO)2. Importantly, Pt(CNArDipp2)2, along with its palladium congener Pd(CNArDipp2)2, represent the only monomeric and zero-valent binary isocyanide complexes of these metals. These complexes can act as the Lewis basic component of Metal-only Lewis Pairs (MOLPs), binding thallium(I) and silver(I) via retrodative σ-bonds. Reactivity studies of Pt(CNArDipp2)2 culminated in the discovery of a very rare singly-buttressed metal-borane adduct Pt(κ2-N,B-Cy2BIM)(CNArDipp2), which is synthesized via hydroboration of a coordinated isocyanide ligand to form an ambiphilic (boryl)iminomethane (BIM) ligand. This complex exhibits rich reactivity with small molecules via metal/borane cooperation. It is shown to effect various E-H and E-X bond activations, as well as oxidative insertions of organoazides, organocarbonyls and organonitriles, most of which represent unprecedented reactivity modes for metal-borane adducts. Unligated Cy2BIM can also be synthesized upon hydroboration of CNArDipp2 with dicyclohexylborane. It is shown to be monomeric in solution, allowing it to act as a highly competent Frustrated Lewis pair despite bearing a Lewis acid of only moderate acidity. Two vignettes of ligand-based redox-noninnocence can be found in Chapters 5 and 6. The trinuclear dianion K2[Pt3(µ-CO)3(CNArDipp2)3] and radical anion K(THF)4[Pt3(µ-CO)3(CNArDipp2)3] were synthesized, notable as the all-carbonyl variants [Pt3(CO)6]2–/1– are unstable and have never been crystallographically characterized. Most importantly, it is shown that the highest occupied molecular orbital in these complexes is primarily CO/CNR π*, producing the first example of an ensemble of CO and isocyanide ligands exhibiting redox-noninnocence. Finally, solution dynamics of the palladium bis-nitroxide diradicals trans-Pd(κ1-N-ArNO)2(CNArDipp2)2 were examined to gain insights into their stability and mode of decomposition. Judicious electronic modulation of the redox-active nitrosoarene ligands revealed that installation of para-formyl or para-cyano substituents greatly increased the kinetic stability of the corresponding diradicals, signaling a potentially general strategy for the stabilization of inherently short-lived classical nitroxide spin adducts.
Subjects/Keywords: Chemistry; cooperativity; isocyanide; palladium; platinum; redox-noninnocence
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Chicago ·
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APA (6th Edition):
Barnett, B. R. (2016). Platinum and Palladium Isocyanides as Platforms on which to Study Metal/Lewis Acid Cooperativity and Ligand-based Redox-Noninnocence. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/06j1q941
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Barnett, Brandon Richard. “Platinum and Palladium Isocyanides as Platforms on which to Study Metal/Lewis Acid Cooperativity and Ligand-based Redox-Noninnocence.” 2016. Thesis, University of California – San Diego. Accessed March 05, 2021.
http://www.escholarship.org/uc/item/06j1q941.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Barnett, Brandon Richard. “Platinum and Palladium Isocyanides as Platforms on which to Study Metal/Lewis Acid Cooperativity and Ligand-based Redox-Noninnocence.” 2016. Web. 05 Mar 2021.
Vancouver:
Barnett BR. Platinum and Palladium Isocyanides as Platforms on which to Study Metal/Lewis Acid Cooperativity and Ligand-based Redox-Noninnocence. [Internet] [Thesis]. University of California – San Diego; 2016. [cited 2021 Mar 05].
Available from: http://www.escholarship.org/uc/item/06j1q941.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Barnett BR. Platinum and Palladium Isocyanides as Platforms on which to Study Metal/Lewis Acid Cooperativity and Ligand-based Redox-Noninnocence. [Thesis]. University of California – San Diego; 2016. Available from: http://www.escholarship.org/uc/item/06j1q941
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
20.
Wu, Xiaoxing.
Platinum-palladium catalysts for methane-fuelled
heaters.
Degree: MS, Department of Chemical and Materials
Engineering, 2015, University of Alberta
URL: https://era.library.ualberta.ca/files/8p58pg891
► Natural-gas fuelled catalytic heaters are commonly used in heating industrial space and remote location operations. Industrial units typically contain platinum that provides methane combustion at…
(more)
▼ Natural-gas fuelled catalytic heaters are commonly
used in heating industrial space and remote location operations.
Industrial units typically contain platinum that provides methane
combustion at lower temperatures than non-catalytic burning. This
work aimed to find a cost-efficient alternative to monometallic
platinum catalyst by replacing some of platinum with less expensive
palladium, which is also known for methane combustion activity. The
task is complicated by non-uniform reactant profiles across the
catalytic pad. Several Pd:Pt bimetallic catalysts were prepared by
dry impregnation of commercial pads with metal precursors and
tested in methane combustion with 5% water presence at two
different methane-to-oxygen molar ratios (0.2 and 0.02). Pt1.6Pd
catalyst (molar ratio) is recommended to replace monometallic
platinum: it provides higher activity than monometallic Pt catalyst
at 0.02 CH4-to-O2 ratio. At the 0.2 ratio, its activity is lower
than that of Pt, but is sufficient for adequate heater
operation.
Subjects/Keywords: Methane combustion; Platinum; Impregnation; Heater; Catalyast; Palladium
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APA ·
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MLA ·
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APA (6th Edition):
Wu, X. (2015). Platinum-palladium catalysts for methane-fuelled
heaters. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/8p58pg891
Chicago Manual of Style (16th Edition):
Wu, Xiaoxing. “Platinum-palladium catalysts for methane-fuelled
heaters.” 2015. Masters Thesis, University of Alberta. Accessed March 05, 2021.
https://era.library.ualberta.ca/files/8p58pg891.
MLA Handbook (7th Edition):
Wu, Xiaoxing. “Platinum-palladium catalysts for methane-fuelled
heaters.” 2015. Web. 05 Mar 2021.
Vancouver:
Wu X. Platinum-palladium catalysts for methane-fuelled
heaters. [Internet] [Masters thesis]. University of Alberta; 2015. [cited 2021 Mar 05].
Available from: https://era.library.ualberta.ca/files/8p58pg891.
Council of Science Editors:
Wu X. Platinum-palladium catalysts for methane-fuelled
heaters. [Masters Thesis]. University of Alberta; 2015. Available from: https://era.library.ualberta.ca/files/8p58pg891
University of Pretoria
21.
Gitari, Patricia
Wanjiru.
Synthesis and
testing of palladium and platinum phosphine complexes with
potential mitochondrial targeting anti-cancer
properties.
Degree: Pharmacology, 2009, University of Pretoria
URL: http://hdl.handle.net/2263/28146
► The main theme of this thesis focuses on the preparation of palladium and platinum phosphine complexes that possess the potential to act as anti-cancer agents.…
(more)
▼ The main theme of this thesis focuses on the preparation
of
palladium and
platinum phosphine complexes that possess the
potential to act as anti-cancer agents. The design of the complexes
was based on the known compound, [Au(dppe)2]Cl which was shown to
have an anti-mitochondrial mode of action on cancer cells. Major
problems were experienced in the synthesis of these novel
palladium
and
platinum compounds as the five phosphine ligands required
diverse reaction conditions. Instability was the major hindrance as
decomposition occurred during purification. This led to the
substitution of the counter-ion (Cl-) with PF6-. The complexes
prepared in this study were varied in lipophilicity as the gold
complex was found to be non-selective due to high lipophilicity. In
total, six compounds were prepared, purified and tested for potency
against a panel of cancer cell lines as well as normal cells. The
most lipophilic compound, [Au(dppe)2]Cl, was non-selective as it
exhibited the highest toxicity to both cancerous and normal cells.
In general, in vitro studies showed that
palladium complexes were
more toxic than the
platinum analogues. These novel compounds were
also non-toxic to both resting and stimulated lymphocytes
signifying high selectivity for cancer cells. Three compounds, Pg
3, Pg 4a and Pg 8 exhibited high toxicity and were hence tested as
such on murine cancer cell lines. Pg 8, with intermediate
lipophilicity, showed toxicity against a larger number of cancer
cell lines and this led to further investigations in an attempt to
determine its mode of action. Analysis of the effects of Pg 8 on
the mitochodria showed that it did not depolarise the mitochondrial
membrane potential. A seven day analysis showed that while it did
not have any effect on the mitochondrial membrane potential, it
depolarised the plasma membrane potential from day 4. In contrast,
[Au(dppe)2]Cl depolarised the mitochondrial membrane potential as
expected. Pg 8 was shown to induce apoptosis and necrosis on Jurkat
cells after exposure for 48 h. It was also shown to induce cell
cycle arrest (after 48 h) as it caused blockade in the S-phase. In
contrast, [Au(dppe)2]Cl caused a blockade in the G0/G1 phase.
Uptake studies with radiolabelled Pg 8, [103Pd(d2pyrpe)2][PF6]2,
showed that it accumulated significantly in Jurkat cells.
Biodistribution studies in Wistar rats demonstrated that it was
mostly taken up in the spleen followed by the liver. However, it
was excreted faster than [198Au(dppe)2]Cl as this latter compound
accumulated significantly in the lungs followed by the spleen,
small intestine and liver. Acute toxicity studies in Balb/c mice
showed that Pg 8 was less toxic than [Au(dppe)2]Cl. The latter
compound (at 3 and 6 ìM) caused a significant reduction of total
body weight over a 5-day period. Toxicity was evident as it was
also shown to cause elevation of liver enzymes (AST and GGT),
contrary to the results obtained from the mice treated with Pg 8
(at 3, 6, 12 and 15 ìM). Preparation of a patent for the synthesis
as well as anti-cancer…
Advisors/Committee Members: Prof C E Medlen (advisor), Prof S Lotz (coadvisor).
Subjects/Keywords: Palladium; Platinum
phosphine complexes;
Anti-cancer;
UCTD
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gitari, P. (2009). Synthesis and
testing of palladium and platinum phosphine complexes with
potential mitochondrial targeting anti-cancer
properties. (Doctoral Dissertation). University of Pretoria. Retrieved from http://hdl.handle.net/2263/28146
Chicago Manual of Style (16th Edition):
Gitari, Patricia. “Synthesis and
testing of palladium and platinum phosphine complexes with
potential mitochondrial targeting anti-cancer
properties.” 2009. Doctoral Dissertation, University of Pretoria. Accessed March 05, 2021.
http://hdl.handle.net/2263/28146.
MLA Handbook (7th Edition):
Gitari, Patricia. “Synthesis and
testing of palladium and platinum phosphine complexes with
potential mitochondrial targeting anti-cancer
properties.” 2009. Web. 05 Mar 2021.
Vancouver:
Gitari P. Synthesis and
testing of palladium and platinum phosphine complexes with
potential mitochondrial targeting anti-cancer
properties. [Internet] [Doctoral dissertation]. University of Pretoria; 2009. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2263/28146.
Council of Science Editors:
Gitari P. Synthesis and
testing of palladium and platinum phosphine complexes with
potential mitochondrial targeting anti-cancer
properties. [Doctoral Dissertation]. University of Pretoria; 2009. Available from: http://hdl.handle.net/2263/28146
Boston College
22.
Szymaniak, Adam Anthony.
Nonracemic Organoboronates by Transition Metal-Catalyzed C-C
and C-Si Bond Forming Reactions.
Degree: PhD, Chemistry, 2018, Boston College
URL: http://dlib.bc.edu/islandora/object/bc-ir:108119
► This dissertation will describe the development of three transition metal-catalyzed syntheses of nonracemic organoboronates. The first chapter explains the development of a palladium-catalyzed enantiotopic-group-selective cross-coupling…
(more)
▼ This dissertation will describe the development of
three transition metal-catalyzed syntheses of nonracemic
organoboronates. The first chapter explains the development of a
palladium-catalyzed enantiotopic-group-selective cross-coupling of
geminal bis(boronates) with alkenyl electrophiles. This process
enables the synthesis of highly valuable nonracemic disubstituted
allylic boronates. Chapter two describes a
palladium-induced
1,2-metallate rearrangement of vinylboron “ate” complexes. The
newly developed process incorporates an alternative route for the
transmetallation step of Suzuki-Miyaura cross-couplings. Lastly, an
enantioselective
platinum-catalyzed hydrosilylation of alkenyl
boronates is disclosed. This reaction enables the synthesis of
nonracemic geminal silylboronates for the divergent synthesis of
functionalized
Advisors/Committee Members: James P. Morken (Thesis advisor).
Subjects/Keywords: catalysis; enantioselective; nonracemic; organoboronates; palladium; platinum
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Szymaniak, A. A. (2018). Nonracemic Organoboronates by Transition Metal-Catalyzed C-C
and C-Si Bond Forming Reactions. (Doctoral Dissertation). Boston College. Retrieved from http://dlib.bc.edu/islandora/object/bc-ir:108119
Chicago Manual of Style (16th Edition):
Szymaniak, Adam Anthony. “Nonracemic Organoboronates by Transition Metal-Catalyzed C-C
and C-Si Bond Forming Reactions.” 2018. Doctoral Dissertation, Boston College. Accessed March 05, 2021.
http://dlib.bc.edu/islandora/object/bc-ir:108119.
MLA Handbook (7th Edition):
Szymaniak, Adam Anthony. “Nonracemic Organoboronates by Transition Metal-Catalyzed C-C
and C-Si Bond Forming Reactions.” 2018. Web. 05 Mar 2021.
Vancouver:
Szymaniak AA. Nonracemic Organoboronates by Transition Metal-Catalyzed C-C
and C-Si Bond Forming Reactions. [Internet] [Doctoral dissertation]. Boston College; 2018. [cited 2021 Mar 05].
Available from: http://dlib.bc.edu/islandora/object/bc-ir:108119.
Council of Science Editors:
Szymaniak AA. Nonracemic Organoboronates by Transition Metal-Catalyzed C-C
and C-Si Bond Forming Reactions. [Doctoral Dissertation]. Boston College; 2018. Available from: http://dlib.bc.edu/islandora/object/bc-ir:108119
Hong Kong University of Science and Technology
23.
Jia, Sitong CBE.
Stability of palladium and platinum-based oxygen reduction electrocatalysts in alkaline solutions.
Degree: 2018, Hong Kong University of Science and Technology
URL: http://repository.ust.hk/ir/Record/1783.1-98276
;
https://doi.org/10.14711/thesis-991012699069303412
;
http://repository.ust.hk/ir/bitstream/1783.1-98276/1/th_redirect.html
► Platinum (Pt) and Palladium (Pd)-based metals are the most active eelctrocatalysts toward oxygen reduction reaction (ORR) in both proton exchange membrane fuel cell and alkaline…
(more)
▼ Platinum (Pt) and Palladium (Pd)-based metals are the most active eelctrocatalysts toward oxygen reduction reaction (ORR) in both proton exchange membrane fuel cell and alkaline fuel cell. The stability of these catalysts during fuel cell operation determines the life of fuel cells. It has been found that the Pt nanoparticles supported on carbon (Pt/C) was less stable in alkaline solutions than that in acids. The stability of Pd-based catalysts, which are more active for ORR than Pt-based ones in alkaline media has been rarely studied. This study focuses on the systematic study on the stability of Pd/C and Pd alloy/C in alkaline solutions and comparing it with the Pt-counterpart. The commercial Pt/C and Pd/C nanoparticles were chosen as model catalysts to evaluate the durability in 0.1 M NaOH solutions under various electrochemical testing conditions. The change in terms of half-wave potential and electrochemical surface areas were compared after 100, 500 and 2500 cycles. It was found that the Pd/C had a much better durability than Pt/C under the same conditions. Alloying Pt and Pd with other transition metals (Fe, Co and Ni) was also attempted. The alloys showed much higher activity and stability. In addition, the mechanisms of activity decay were also studied by advanced characterization techniques including identical location transmission electron microscope (IL-TEM), in situ Fourier-transform infrared spectroscopy (FTIR), and online inductively coupled plasma mass spectrometer (ICP-MS). This study provided new insights and guidelines in the design of more advanced electrocatalysts for oxygen reduction reaction in alkaline solution.
Subjects/Keywords: Electrocatalysis
; Palladium catalysts
; Platinum catalysts
; Alkalies
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Jia, S. C. (2018). Stability of palladium and platinum-based oxygen reduction electrocatalysts in alkaline solutions. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-98276 ; https://doi.org/10.14711/thesis-991012699069303412 ; http://repository.ust.hk/ir/bitstream/1783.1-98276/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jia, Sitong CBE. “Stability of palladium and platinum-based oxygen reduction electrocatalysts in alkaline solutions.” 2018. Thesis, Hong Kong University of Science and Technology. Accessed March 05, 2021.
http://repository.ust.hk/ir/Record/1783.1-98276 ; https://doi.org/10.14711/thesis-991012699069303412 ; http://repository.ust.hk/ir/bitstream/1783.1-98276/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jia, Sitong CBE. “Stability of palladium and platinum-based oxygen reduction electrocatalysts in alkaline solutions.” 2018. Web. 05 Mar 2021.
Vancouver:
Jia SC. Stability of palladium and platinum-based oxygen reduction electrocatalysts in alkaline solutions. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2018. [cited 2021 Mar 05].
Available from: http://repository.ust.hk/ir/Record/1783.1-98276 ; https://doi.org/10.14711/thesis-991012699069303412 ; http://repository.ust.hk/ir/bitstream/1783.1-98276/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jia SC. Stability of palladium and platinum-based oxygen reduction electrocatalysts in alkaline solutions. [Thesis]. Hong Kong University of Science and Technology; 2018. Available from: http://repository.ust.hk/ir/Record/1783.1-98276 ; https://doi.org/10.14711/thesis-991012699069303412 ; http://repository.ust.hk/ir/bitstream/1783.1-98276/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
KTH
24.
Fuente, Ibone Elorriaga de la.
Noble Metal Catalysts for the Hydrocracking of Fischer-Tropsch waxes.
Degree: Chemical Science and Engineering (CHE), 2012, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156376
► Fischer-Tropsch synthesis enables the production of high quality diesel fuel from biomass derived synthesis gas. In order to increase the overall diesel yield, it…
(more)
▼ Fischer-Tropsch synthesis enables the production of high quality diesel fuel from biomass derived synthesis gas. In order to increase the overall diesel yield, it is necessary to perform a subsequent hydrocracking of the long-chain linear paraffins. This work is focused on characterization and testing of catalysts for the hydrocracking reaction of Fischer-Tropsch waxes. In particular, noble metal catalyst based on Pt and Pd on amorphous silica-alumina support were tested. Palladium based catalysts performed nearly an ideal bifunctional mechanism, while platinum based catalysts performed another way of cracking: hydrogenolysis. Platinum based catalysts are more active than palladium ones, with the same metal loading. This is a consequence of the nature of the metal sites. The product distribution is similar for both platinum and palladium catalysts. However, due to the hydrogenolysis cracking mechanism performed by platinum based catalysts, the amount of light gases produced on platinum based catalysts is higher. Furthermore, the deactivation behavior of the Platinum and Palladium catalysts has been studied, and the results showed that the dispersion of the active phase decreased with deactivation and the average crystallite diameter increased. This means a decrease in activity. A regeneration program, temperature programmed oxidation (TPO), has been carried out demonstrating that the activity was not completely recovered.
Subjects/Keywords: hydrocracking; platinum; palladium; Fischer Tropsch; hexadecane
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Fuente, I. E. d. l. (2012). Noble Metal Catalysts for the Hydrocracking of Fischer-Tropsch waxes. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156376
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fuente, Ibone Elorriaga de la. “Noble Metal Catalysts for the Hydrocracking of Fischer-Tropsch waxes.” 2012. Thesis, KTH. Accessed March 05, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156376.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fuente, Ibone Elorriaga de la. “Noble Metal Catalysts for the Hydrocracking of Fischer-Tropsch waxes.” 2012. Web. 05 Mar 2021.
Vancouver:
Fuente IEdl. Noble Metal Catalysts for the Hydrocracking of Fischer-Tropsch waxes. [Internet] [Thesis]. KTH; 2012. [cited 2021 Mar 05].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156376.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fuente IEdl. Noble Metal Catalysts for the Hydrocracking of Fischer-Tropsch waxes. [Thesis]. KTH; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156376
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
KTH
25.
París, Rodrigo Suárez.
Noble metal catalysts for the hydrocracking of FT waxes.
Degree: Chemical Science and Engineering (CHE), 2012, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158477
► Bifunctional catalysts consisting of palladium or platinum and supported on amorphous silica-alumina were prepared and tested in the hydrocracking of n-hexadecane, which is considered…
(more)
▼ Bifunctional catalysts consisting of palladium or platinum and supported on amorphous silica-alumina were prepared and tested in the hydrocracking of n-hexadecane, which is considered to be representative of n-paraffins in hydrocracker feeds. In addition to the evaluation of the physicochemical properties, a comprehensive study on catalyst activity and selectivity has been conducted, in the full range of conversions. A theoretical model was proposed to fit the experimental conversion-selectivity data. The n-hexadecane reactivity pattern was expressed in terms of a reaction network involving lumps consisting of monobranched and multibranched n-hexadecane isomers, and cracking products. Pseudo first order kinetics and irreversible reaction steps were assumed in order to obtain the kinetic constants of each step. For the same metallic molar loading, a platinum-based catalyst proved more active than a palladium one. The reaction network model showed that cracking products were produced by means of a bifunctional mechanism on palladium catalysts, with n-hexadecane isomers as intermediates. However, on platinum catalysts, an additional monofunctional mechanism was observed. The noble metal catalyzes the hydrogenolysis of n-hexadecane without requiring any acid function. An increase in the platinum loading leads to an increase in the importance of this direct cracking route. The deactivation in the platinum-based catalysts is only due to coke formation, which deactivates the metal sites. The regeneration by means of a Temperature-Programmed Oxidation does not lead to a complete recovery of the metal function, according to the volumetric chemisorption measurements and the experimental selectivity data. Further work is required to determine the real causes.
Subjects/Keywords: Hydrocracking; Fischer-Tropsch; Hexadecane; Platinum; Palladium
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
París, R. S. (2012). Noble metal catalysts for the hydrocracking of FT waxes. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158477
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
París, Rodrigo Suárez. “Noble metal catalysts for the hydrocracking of FT waxes.” 2012. Thesis, KTH. Accessed March 05, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158477.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
París, Rodrigo Suárez. “Noble metal catalysts for the hydrocracking of FT waxes.” 2012. Web. 05 Mar 2021.
Vancouver:
París RS. Noble metal catalysts for the hydrocracking of FT waxes. [Internet] [Thesis]. KTH; 2012. [cited 2021 Mar 05].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158477.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
París RS. Noble metal catalysts for the hydrocracking of FT waxes. [Thesis]. KTH; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158477
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Loughborough University
26.
Lastra Calvo, Nuria.
Synthesis of novel aminomethylphosphine complexes.
Degree: PhD, 2015, Loughborough University
URL: http://hdl.handle.net/2134/17984
► A new series of aminomethylphosphine ligands incorporating a PCN backbone and a pendant amine were synthesised using a phosphorus Mannich condensation reaction. Their coordination capabilities…
(more)
▼ A new series of aminomethylphosphine ligands incorporating a PCN backbone and a pendant amine were synthesised using a phosphorus Mannich condensation reaction. Their coordination capabilities were investigated with late transition metal centres. Following a procedure well established within our research group, several phosphines were obtained using {P(CH2OH)4}Cl (THPC) in two steps. Firstly, THPC was reacted with various ortho and para anilines to give phosphonium salts P{CH2N(H)R}4Cl (R = C6H5, o-MeC6H4, o-i PrC6H4, o-t BuC6H4, o-FC6H4, o-CF3C6H4, o-{C(Me)=CH2}C6H4, p-MeC6H4, p-i PrC6H4, p-FC6H4 and p-EtC6H4). Secondly, these new salts were reacted with Et3N to obtain the cyclic RN(H)CH2P{(CH2)3(NR)2} phosphines (R = para-substituted anilines) or with KOt Bu to obtain acyclic P{CH2N(H)R}3 phosphines (R = ortho-substituted anilines) and cyclic P{CH2N(R)CH2}2P diphosphines (R = ortho-substituted anilines). Double condensation was observed in the 31P{1 H} NMR of cyclic phosphines RN(H)CH2P{(CH2)3(NR)2} to form {(CH2)3(NR)2}PCH2N(R)CH2P{(CH2)3(NR)2} diphosphines. Some cyclic phosphines were investigated under a wide range of conditions with Ph2PCH2OH giving asymmetric Ph2PCH2N(R)CH2P{(CH2)3(NR)2} diphosphines along with symmetric diphosphines counterparts and other phosphorus coproducts according to 31P{1 H} NMR and MS. A novel bicyclic OP{CH2N(R)CH2}3PO diphosphine (R = p-MeC6H4) was obtained as crystalline solid from the filtrate of the reaction between RN(H)CH2P{(CH2)3(NR)2} and Ph2PCH2OH and it was characterised by X-ray spectroscopy. Attempts to synthesise this diphosphine from P(CH2OH)3 and p-MeC6H4 were unsuccessful. The family of aminomethylphosphine ligands was extended by treating Ph2PCH2OH or CgPCH2OH (Cg = 1,3,5,7-tetramethyl-2,4,8-trioxa-6-phosphaadamantane) with various primary amines to afford R(H)NCH2PR'2 (R' = Cg or Ph). Symmetric Ph2PCH2N(R)CH2Ph2 diphosphines were observed in the 31P{1 H} NMR spectra indicating that phosphines with Ph2P-moiety were more susceptible to undertake a second condensation. Novel asymmetric o-{Ph2PCH2C(H)(CH3)}C6H4N(H)CH2PPh2 diphosphine was synthesised by treatment of o-{C(Me)=CH2}C6H4NH2 with Ph2PH to afford o-{Ph2PCH2C(H)(CH3)}C6H4NH2 followed by condensation of the amino group with Ph2PCH2OH. Analogous o-{CgPCH2C(H)(CH3)}C6H4NH2 phosphine was also obtained. The coordination capabilities of selected compounds was studied with late transition metal precursor such as Pt(II), Pd(II) and Ru(II). Monophosphine compounds acted as Pmonodentate ligands to form square planar cis and trans MCl2L2 (M = Pt and Pd) complexes. However, whereas cyclic ligands RN(H)CH2P{(CH2)3(NR)2} afforded cisMCl2L2, acyclic ligands P{CH2N(H)R}3 afforded trans-MCl2L2 along with cis-PtCl2L2 in some cases. Those phosphines which conducted double condensation adopted a P,Pchelate mode to form a 6-membered M-P-C-N-C-P to afford cis-MCl2L (M = Pt and Pd). More interesting is the rarely observed P,P-bridging mode exhibited by P{CH2N(R)CH2}2P ligands to form homobimetallic cis-(PtCl2L)2 complexes and…
Subjects/Keywords: 546; Phosphines; Platinum; Palladium; Complexes; Synthesis
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APA (6th Edition):
Lastra Calvo, N. (2015). Synthesis of novel aminomethylphosphine complexes. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/17984
Chicago Manual of Style (16th Edition):
Lastra Calvo, Nuria. “Synthesis of novel aminomethylphosphine complexes.” 2015. Doctoral Dissertation, Loughborough University. Accessed March 05, 2021.
http://hdl.handle.net/2134/17984.
MLA Handbook (7th Edition):
Lastra Calvo, Nuria. “Synthesis of novel aminomethylphosphine complexes.” 2015. Web. 05 Mar 2021.
Vancouver:
Lastra Calvo N. Synthesis of novel aminomethylphosphine complexes. [Internet] [Doctoral dissertation]. Loughborough University; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2134/17984.
Council of Science Editors:
Lastra Calvo N. Synthesis of novel aminomethylphosphine complexes. [Doctoral Dissertation]. Loughborough University; 2015. Available from: http://hdl.handle.net/2134/17984
University of the Western Cape
27.
Dywili, Nomxolisi.
Polyanilino-graphene oxide intercalated with platinum group metal nanocomposites, for application as novel supercapacitor materials
.
Degree: 2014, University of the Western Cape
URL: http://hdl.handle.net/11394/4453
► Supercapacitors are one of the important subjects concerning energy storage which has proven to be a challenge in this country. Currently, the electrodes of most…
(more)
▼ Supercapacitors are
one of the important subjects concerning energy storage which has proven to be a challenge in this country. Currently, the electrodes of most commercial supercapacitor are made of carbon which is known to be inexpensive and has high resistance to corrosion. These carbon based supercapacitors operate under EDLC. They offer fast charging/discharging rates and have the ability to sustain millions of cycles without degrading. With their high power densities, they bridge the gap between batteries which offer high energy densities but are slow in charging/discharging and conventional dielectric capacitors which are very fast but having very low energy densities. The objective of this work was to develop a high performance supercapacitor using polyanilino-graphene oxide intercalated with
platinum group metal nanocomposites. Specific capacitance of each material was investigated with the objective of ascertaining the material that has the best capacitance. In this work, GO was functionalized with aniline and intercalated with Pt, Pd and Pd-Pt nanocomposites. The nanomaterials were characterized with FTIR, Ultravioletvisible (UV-visible) spectroscopy, high resolution scanning
electron microscopy (HRSEM), high resolution transmission
electron microscopy (HRTEM), energy dispersive x-ray microanalysis (EDS) and X-ray diffraction (XRD) analysis. The composites were tested for possible application as supercapacitor materials using potentiostatic-galvanostatic constant current charge/discharge. The synthesized materials had good electronic, mechanical, optical, physical etc. properties as proven by the various characterization techniques but they proved not to be ideal for application as supercapacitor materials. The materials tested negative when tested for both anodic and cathodic materials therefore we can conclude that the materials are not good supercapacitor materials and therefore cannot be used in application as novel as supercapacitors.
Advisors/Committee Members: Iwuoha, Emmanuel I (advisor).
Subjects/Keywords: Supercapacitors;
Graphene oxide;
Palladium nanoparticles;
Platinum nanoparticles
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APA (6th Edition):
Dywili, N. (2014). Polyanilino-graphene oxide intercalated with platinum group metal nanocomposites, for application as novel supercapacitor materials
. (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/4453
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dywili, Nomxolisi. “Polyanilino-graphene oxide intercalated with platinum group metal nanocomposites, for application as novel supercapacitor materials
.” 2014. Thesis, University of the Western Cape. Accessed March 05, 2021.
http://hdl.handle.net/11394/4453.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dywili, Nomxolisi. “Polyanilino-graphene oxide intercalated with platinum group metal nanocomposites, for application as novel supercapacitor materials
.” 2014. Web. 05 Mar 2021.
Vancouver:
Dywili N. Polyanilino-graphene oxide intercalated with platinum group metal nanocomposites, for application as novel supercapacitor materials
. [Internet] [Thesis]. University of the Western Cape; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11394/4453.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dywili N. Polyanilino-graphene oxide intercalated with platinum group metal nanocomposites, for application as novel supercapacitor materials
. [Thesis]. University of the Western Cape; 2014. Available from: http://hdl.handle.net/11394/4453
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
California State University – Sacramento
28.
Wheeler, Valerie.
Nuances de vie: photographic printmaking in three mediums.
Degree: MA, Special Major (Printmaking and Photography, 2012, California State University – Sacramento
URL: http://hdl.handle.net/10211.9/1741
► The goal of this special major in printmaking and photography was to bridge the two art forms through photo etching using classical and modern methods.…
(more)
▼ The goal of this special major in printmaking and photography was to bridge the two art forms through photo etching using classical and modern methods. In the process of learning large format photography, intaglio printmaking (photogravure), and non-etch intagliotype printing, I expanded the project to include
platinum and
palladium printing (making platinotypes and platino-palladiotypes). The continuity among the mediums rested upon the images, a few of which were printed in more than
one medium. Landscapes, floral still-lifes, architecture, and a few portraits came together in a body of complementary work consisting of fifty-two images in four sizes. The thesis exhibition was installed and open for a week in the Robert Else Gallery; it included short technical labels to explain the three mediums. Viewer response was strong and positive.
The thesis essay offers written support for the project: its rationale, progress, difficulties, images, aesthetics, relationship to the history of art, processes, and meaning to me, its creator.
Advisors/Committee Members: Goff, Sharmon.
Subjects/Keywords: Platinum-palladium printing; Alternative photography; Photogravure; Intagliotypes
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APA (6th Edition):
Wheeler, V. (2012). Nuances de vie: photographic printmaking in three mediums. (Masters Thesis). California State University – Sacramento. Retrieved from http://hdl.handle.net/10211.9/1741
Chicago Manual of Style (16th Edition):
Wheeler, Valerie. “Nuances de vie: photographic printmaking in three mediums.” 2012. Masters Thesis, California State University – Sacramento. Accessed March 05, 2021.
http://hdl.handle.net/10211.9/1741.
MLA Handbook (7th Edition):
Wheeler, Valerie. “Nuances de vie: photographic printmaking in three mediums.” 2012. Web. 05 Mar 2021.
Vancouver:
Wheeler V. Nuances de vie: photographic printmaking in three mediums. [Internet] [Masters thesis]. California State University – Sacramento; 2012. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10211.9/1741.
Council of Science Editors:
Wheeler V. Nuances de vie: photographic printmaking in three mediums. [Masters Thesis]. California State University – Sacramento; 2012. Available from: http://hdl.handle.net/10211.9/1741
University of Toronto
29.
Sullivan, Neal Alexander.
Mobilization of Platinum, Palladium and Gold by Magmatic Brines: An Experimental Study.
Degree: PhD, 2020, University of Toronto
URL: http://hdl.handle.net/1807/103367
► Magmatic ore deposits enriched in platinum-group elements (PGE) often show evidence of previous hydrothermal activity. However, the exact role of hydrothermal processes in PGE ore…
(more)
▼ Magmatic ore deposits enriched in
platinum-group elements (PGE) often show evidence of previous hydrothermal activity. However, the exact role of hydrothermal processes in PGE ore formation has been uncertain due, in part, to a lack of systematic experimental data on the solubility and speciation of the PGE in hydrothermal fluids. To fill this knowledge gap, this thesis presents results using the synthetic fluid inclusion method to determine the solubility and speciation of Pt, Pd and Au in Cl-bearing aqueous fluids at conditions relevant to the emplacement of magmas in the crustal environment. The data presented here show that high temperature aqueous brines can transport well above 1 μg/g Pt, Pd and Au, as determined by fluid concentrations at metal saturation.
Platinum and Pd are predicted to be in the 2+
oxidation state, whereas Au is predicted to be in the 1+
oxidation state in the fluids investigated. The solubilities of Pt, Pd and Au show a positive correlation with oxygen fugacity (ƒO2), temperature (T), fluid acidity (pH) and total chloride concentration (Cltotal). Trends in solubility with pH and total chlorinity indicate that Pt, Pd and Au are transported as chloride complexes. Results from thermodynamic modeling suggest that Pt and Pd are primarily transported as PtCl3– and PdCl3–, with minor contributions from PtCl2 and PdCl2, in high-temperature aqueous brines. Thermodynamic modeling predictions regarding the complexing species of Au are less certain, although HAuCl2 is expected to be important at high chloride concentrations and at low pH, with AuCl predominant at low chloride concentrations and at high pH. The relatively high metal solubilities determined in this work indicate hydrothermal fluids may be important in the processes that govern the formation of PGE enriched ore deposits. Additional work was done to apply the fluid-trap method with a modified cryogenic cell to obtain accurate metal solubilities at the sub-μg/g level. Despite several advancements being made in the method development, metal-fluid equilibrium could not be demonstrated in the experimental runs. Therefore, additional work is required to validate the fluid-trap method as a reliable technique to measure precious metal solubilities in upper crustal environments.
Advisors/Committee Members: Brenan, James M, Zajacz, Zoltán, Earth Sciences.
Subjects/Keywords: Brine; Gold; Hydrothermal; Magmatic; Palladium; Platinum; 0996
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sullivan, N. A. (2020). Mobilization of Platinum, Palladium and Gold by Magmatic Brines: An Experimental Study. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/103367
Chicago Manual of Style (16th Edition):
Sullivan, Neal Alexander. “Mobilization of Platinum, Palladium and Gold by Magmatic Brines: An Experimental Study.” 2020. Doctoral Dissertation, University of Toronto. Accessed March 05, 2021.
http://hdl.handle.net/1807/103367.
MLA Handbook (7th Edition):
Sullivan, Neal Alexander. “Mobilization of Platinum, Palladium and Gold by Magmatic Brines: An Experimental Study.” 2020. Web. 05 Mar 2021.
Vancouver:
Sullivan NA. Mobilization of Platinum, Palladium and Gold by Magmatic Brines: An Experimental Study. [Internet] [Doctoral dissertation]. University of Toronto; 2020. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1807/103367.
Council of Science Editors:
Sullivan NA. Mobilization of Platinum, Palladium and Gold by Magmatic Brines: An Experimental Study. [Doctoral Dissertation]. University of Toronto; 2020. Available from: http://hdl.handle.net/1807/103367
University of the Western Cape
30.
Ngwanakgagane, Sentsho Zelda.
Hydrogenisation of metals
.
Degree: 2013, University of the Western Cape
URL: http://hdl.handle.net/11394/4430
► Transition metals are a group of metals which are light in weight and have high hydrogen solubility. Their interaction with hydrogen is exorthermic and this…
(more)
▼ Transition metals are a group of metals which are light in weight and have high hydrogen solubility. Their interaction with hydrogen is exorthermic and this phenomenon makes them “ideal” candidates for various applications of hydrogen storage systems. This explains why the phenomenon of hydrogen storage in Pd is used as a model for hydrogen storage systems because of the nature of absorption associated with it (like a sponge even at low temperatures). The hydrogenation process can be conducted at either room or high temperatures in a furnace under low pressure-low hydrogen gas concentration-short hydrogenation time (LP-LC-ST) and in intelligent gravimetric analyser under high pressurehigh hydrogen gas concentration-long hydrogenation time conditions. Most of the research on hydrogen storage sytems is based on gravimetric analysis of absorbed and desorbed hydrogen concentration. In this work, a comparison study of the hydrogen content in pure Pd, Pd-Pt coated systems, Pd-Pt alloys, commercially pure Ti and Ti-6Al-4V alloy determined by gravimetric methods and elastic recoil detection analysis (which is based on the detection of recoiled hydrogen after interaction with He+ ions) technique was investigated. The changes in the structural properties and the hydrogen content of the materials when exposed to a hydrogen gas environment for different durations at various system temperatures and pressures will be reported. These changes have an effect on the microstructure of CP-Ti and Ti-6Al-4V alloy and structural properties of all the hydrogenated materials. The results obtained from optical microscopy, scanning
electron microscopy, x-ray diffraction, intelligent gravimetric analyser, digital balance, elastic recoil detection analysis and Vickers hardness test, show the following: it is found that hydrogenation of Pd at elevated temperatures (550 ˚C and 650 ˚C) does not yield hydrides under LP-LC-ST conditions. However, at room temperature the absorption of hydrogen occurred faster at the beginning of the process. Furthermore, the absorption of hydrogen increased with pressure where optimum absorption (0.67 wt. % hydrogen concentration) occurred under a system pressure of 2000 mbar. After pressure release, the remaining hydrogen content in the Pd sample was 0.6 wt. %. The Pd-Pt coated system provide hydrogen mobility at 550 and 650 ˚C where hydrides were formed under LP-LC-ST conditions. In addition to the decrease of hydrogen solubility in Pd-Pt alloys with an increase in Pt content, the probability of the alloys to achieve full saturation also decreases with an increase in Pt content under HP-HC-LT conditions. CP-Ti and Ti-6Al-4V alloy absorb substantial amount of hydrogen in the first hour of room temperature hydrogenation under LP-LC-ST conditions but hydrides were not formed. Therefore, under LP-LC-ST conditions at room temperature, Pd is able to store hydrogen in the form of hydrides whereas Ti and Ti-6Al-4V alloy could not. The 550 ˚C is the optimum temperature for hydrogenation of CP-Ti under LP-LC-ST conditions.…
Advisors/Committee Members: Topic, M (advisor), Arendse, Christopher J (advisor).
Subjects/Keywords: Hydrogen storage systems;
Palladium (Pd);
Palladium-Platinum (Pd-Pt) alloys
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APA ·
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MLA ·
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Export
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Manager
APA (6th Edition):
Ngwanakgagane, S. Z. (2013). Hydrogenisation of metals
. (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/4430
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ngwanakgagane, Sentsho Zelda. “Hydrogenisation of metals
.” 2013. Thesis, University of the Western Cape. Accessed March 05, 2021.
http://hdl.handle.net/11394/4430.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ngwanakgagane, Sentsho Zelda. “Hydrogenisation of metals
.” 2013. Web. 05 Mar 2021.
Vancouver:
Ngwanakgagane SZ. Hydrogenisation of metals
. [Internet] [Thesis]. University of the Western Cape; 2013. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11394/4430.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ngwanakgagane SZ. Hydrogenisation of metals
. [Thesis]. University of the Western Cape; 2013. Available from: http://hdl.handle.net/11394/4430
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] [4] [5] ▶
. 
Open Access Theses and Dissertations
