subject:(Water gas shift)

Delft University of Technology

1. De Lange, M.F. Fricdiff: Parameter estimation and feasibility assessment of combination of Fricdiff and reaction:.

Degree: 2010, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:54fcb117-5167-4738-afbc-f0ede476aafe

► Fricdiff, which either stands for frictional diffusion or frictional difference is a separation technology for the separation of gas and vapour mixtures. It is based… (more)

Subjects/Keywords: Fricdif; separation; water-gas shift

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

De Lange, M. F. (2010). Fricdiff: Parameter estimation and feasibility assessment of combination of Fricdiff and reaction:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:54fcb117-5167-4738-afbc-f0ede476aafe

Chicago Manual of Style (16^th Edition):

De Lange, M F. “Fricdiff: Parameter estimation and feasibility assessment of combination of Fricdiff and reaction:.” 2010. Masters Thesis, Delft University of Technology. Accessed November 15, 2019. http://resolver.tudelft.nl/uuid:54fcb117-5167-4738-afbc-f0ede476aafe.

MLA Handbook (7^th Edition):

De Lange, M F. “Fricdiff: Parameter estimation and feasibility assessment of combination of Fricdiff and reaction:.” 2010. Web. 15 Nov 2019.

Vancouver:

De Lange MF. Fricdiff: Parameter estimation and feasibility assessment of combination of Fricdiff and reaction:. [Internet] [Masters thesis]. Delft University of Technology; 2010. [cited 2019 Nov 15]. Available from: http://resolver.tudelft.nl/uuid:54fcb117-5167-4738-afbc-f0ede476aafe.

Council of Science Editors:

De Lange MF. Fricdiff: Parameter estimation and feasibility assessment of combination of Fricdiff and reaction:. [Masters Thesis]. Delft University of Technology; 2010. Available from: http://resolver.tudelft.nl/uuid:54fcb117-5167-4738-afbc-f0ede476aafe

The Ohio State University

2. Gawade, Preshit Vilas. REDOX CATALYSIS FOR ENVIRONMENTAL APPLICATIONS.

Degree: PhD, Chemical and Biomolecular Engineering, 2012, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1341412462

► The presented work comprehends a broad spectrum of redox catalysis for various environmental applications, such as i) hydrogen production via water-gas shift reaction, ii)… (more)

▼ The presented work comprehends a broad spectrum of redox catalysis for various environmental applications, such as i) hydrogen production via water-gas shift reaction, ii) hydrogen purification for fuel cell applications and iii) catalytic after-treatment of lean-burn engines. This dissertation involves, but is not limited to catalyst development, reaction studies and catalyst characterization for the above-mentioned environmental applications, which can be summarized as follows. (i) Water-gas shift (WGS) remains an essential step in integrated gasification combined cycle (IGCC) for hydrogen production, as it forms a link between the gasification process and fuel cell operations. The current catalysts for WGS application are based on Fe-Cr and Cu/ZnO/Al2O3, as a high temperature (HT-WGS) and low temperature (LT-WGS) catalysts, respectively. This two-stage WGS process is a consequence of several operational drawbacks of the current catalyst formulations including Cr+6 being carcinogenic. Hence the presented WGS project has a two-fold purpose. First, Cr-free Fe-based catalyst development and second, Cu supported catalyst development for WGS that can be operated over a wide temperature range. In this dissertation, Cr- free Fe-Al-Cu catalyst prepared through “one-step” sol-gel method using propylene oxide as a gelation agent has been reported. Steady state reactions demonstrated that WGS performance of Fe-Al-Cu was superior as compared to commercial Fe-Cr catalyst. The reaction studies along with complementary catalyst characterization indicated that the amount of copper in iron oxide matrix played a crucial role. The optimized ratio of Fe to Cu was found to be five and any further increase in copper loading resulted in copper segregation from the iron oxide matrix. Thus various catalyst characterization techniques were exploited to understand this phenomenon. Furthermore, a detailed study was performed to comprehend the formation of surface species during WGS reaction and to evaluate the reaction mechanism over Fe-Al-Cu. In the quest of exploring Cu-based catalyst for WGS system, Cu supported over various CeO2 nano-morphologies were investigated. Here, nanoparticles (NP) and nanorods (NR) of CeO2 were prepared through hydrothermal precipitation method and copper was supported on these morphologies using a wet impregnation method. In the current findings, copper was more finely and uniformly dispersed over CeO2 nano-particles compared to nanorods, resulting in better WGS activity compared to particle-based samples. Catalyst characterization indicated finely dispersed copper particles in close interaction with ceria nanoparticles, whereas isolated bulk-like copper species were formed over the ceria nanorods. Finally, the formation of surface species during WGS reaction delineated the redox reaction mechanism over Cu/CeO2. (ii) Hydrogen produced via WGS reaction may contain up to 1-2% CO in stream which can be poisonous to proton exchange membrane (PEM) fuel cell. Preferential oxidation of… Advisors/Committee Members: Ozkan, Umit (Advisor).

Subjects/Keywords: Chemical Engineering; Water-gas-shift; PROX; hydrocarbon-SCR; catalyst; emission

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gawade, P. V. (2012). REDOX CATALYSIS FOR ENVIRONMENTAL APPLICATIONS. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1341412462

Chicago Manual of Style (16^th Edition):

Gawade, Preshit Vilas. “REDOX CATALYSIS FOR ENVIRONMENTAL APPLICATIONS.” 2012. Doctoral Dissertation, The Ohio State University. Accessed November 15, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1341412462.

MLA Handbook (7^th Edition):

Gawade, Preshit Vilas. “REDOX CATALYSIS FOR ENVIRONMENTAL APPLICATIONS.” 2012. Web. 15 Nov 2019.

Vancouver:

Gawade PV. REDOX CATALYSIS FOR ENVIRONMENTAL APPLICATIONS. [Internet] [Doctoral dissertation]. The Ohio State University; 2012. [cited 2019 Nov 15]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1341412462.

Council of Science Editors:

Gawade PV. REDOX CATALYSIS FOR ENVIRONMENTAL APPLICATIONS. [Doctoral Dissertation]. The Ohio State University; 2012. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1341412462

3. Wainaina, Steven. Effect of heavy metals on syngas fermentation.

Degree: Engineering and Business, 2016, University of Borås

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10203

► The goal of this work was to establish the suitable and limiting concentrations of Zn, Cu and Mn compounds during syngas fermentation. The results… (more)

Subjects/Keywords: Syngas biomethanation; biological water-gas-shift; heavy metals

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wainaina, S. (2016). Effect of heavy metals on syngas fermentation. (Thesis). University of Borås. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10203

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wainaina, Steven. “Effect of heavy metals on syngas fermentation.” 2016. Thesis, University of Borås. Accessed November 15, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10203.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wainaina, Steven. “Effect of heavy metals on syngas fermentation.” 2016. Web. 15 Nov 2019.

Vancouver:

Wainaina S. Effect of heavy metals on syngas fermentation. [Internet] [Thesis]. University of Borås; 2016. [cited 2019 Nov 15]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10203.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wainaina S. Effect of heavy metals on syngas fermentation. [Thesis]. University of Borås; 2016. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10203

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Mississippi State University

4. Wijayapala, Hevagamage Rangana Thilan. Catalytic conversion of biomass to bio-fuels.

Degree: PhD, Chemistry, 2014, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10292014-171413/ ;

► The conversion of biomass to bio-fuel has received considerable attention as a sustainable way to produce energy. As worldwide fossil fuels become depleted these… (more)

▼ The conversion of biomass to bio-fuel has received considerable attention as a sustainable way to produce energy. As worldwide fossil fuels become depleted these efforts grow in importance. The overall strategy is to transform the parent biomass feedstock to increase C-C bonds while reducing oxygen in the final products. A catalytic approach is often used to achieve good yields of transportation grade liquid hydrocarbons from biomass. Development of novel catalyst systems to aid in the thermochemical conversion of biomass to bio-fuel is the focus of this thesis. Gasification of biomass produces synthesis gas (CO and H₂). Synthesis gas can be converted to liquid hydrocarbons using Fischer-Tropsch (FT) synthesis. Mo/ZSM-5 FT catalysts with a potassium (K) promoter are introduced to enhance liquid hydrocarbon production and CO conversion of synthesis gas. Liquid products and CO conversion were determined using GC-MS analysis with respect to changes in K loading from 0-2%. The highest liquid product selectivity (21.7%) was found with 1.0% K loading while largest CO conversion (63%) was found with 1.2% K loading. This catalyst work was extended by introducing Ni and Co into the Mo/ZSM-5 catalysts. A copper based water gas shift catalyst (WGS) was also used in concert with the FT catalyst to improve product selectivity. This WGS catalyst promotes the in-situ production of H2 while decreasing water content. The FT+WGS catalyst were used to convert both 1:1 CO: H₂ syngas and bio-syngas at 280 °C and 350 °C. The liquid hydrocarbon selectivity was significantly changed and the CO conversion was remarkably increased compared to the reactions without the dual catalyst at both temperatures. In the fourth chapter, FT+WGS catalysts were studied for upgrading bio-oil model compounds. Guaiacol and furfural were used as the model compounds and upgrading reactions were done under H₂, syngas and bio-syngas at 200, 250 and 300 °C. Significant conversion of both guaiacol (85%) and furfural (100%) occurred with syngas at 300 °C. Products upgraded from syngas had a higher combined heat of combustion than the products with pure H2. This suggests the incorporation of some C from CO with model compound upgrading reactions with syngas. Advisors/Committee Members: Dr Todd E. Mlsna (chair), Dr. David O. Wipf (committee member), Dr. Dongmao Zhang (committee member), Dr. Svein Saebo (committee member), Dr. Fei Yu (committee member).

Subjects/Keywords: Water gas shift reaction; Biomass to liquid; Heterogeneous catalyst; FischerTropsch synthesis

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wijayapala, H. R. T. (2014). Catalytic conversion of biomass to bio-fuels. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10292014-171413/ ;

Chicago Manual of Style (16^th Edition):

Wijayapala, Hevagamage Rangana Thilan. “Catalytic conversion of biomass to bio-fuels.” 2014. Doctoral Dissertation, Mississippi State University. Accessed November 15, 2019. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10292014-171413/ ;.

MLA Handbook (7^th Edition):

Wijayapala, Hevagamage Rangana Thilan. “Catalytic conversion of biomass to bio-fuels.” 2014. Web. 15 Nov 2019.

Vancouver:

Wijayapala HRT. Catalytic conversion of biomass to bio-fuels. [Internet] [Doctoral dissertation]. Mississippi State University; 2014. [cited 2019 Nov 15]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10292014-171413/ ;.

Council of Science Editors:

Wijayapala HRT. Catalytic conversion of biomass to bio-fuels. [Doctoral Dissertation]. Mississippi State University; 2014. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10292014-171413/ ;

University of Tennessee – Knoxville

5. Houston, Ross Wesley. Computational Fluid Dynamic Modeling of Catalytic Hydrous Pyrolysis of Biomass to Produce Refinery-Ready Bio-Crude Oil.

Degree: MS, Biosystems Engineering, 2018, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_gradthes/5122

► The growing world population continually increases the demand for energy. Currently, the main source of energy production is fossil fuels, which are harmful to the… (more)

▼ The growing world population continually increases the demand for energy. Currently, the main source of energy production is fossil fuels, which are harmful to the environment and are finite. An exploration of renewable energy to supplement or replace fossil fuels is of great importance. Modern techniques for producing renewable bio-oil consist of converting biomass into bio-oil through pyrolysis, but unfortunately, pyrolysis oil has quality issues (e.g., high oxygen content, viscosity, chemical instability). Therefore, upgrading is necessary to improve quality. Hydropyrolysis is a state of the art technique to deoxygenate bio-oil during pyrolysis to produce petroleum quality bio-oil. A major issue with hydropyrolysis is the expensive cost of hydrogen.This project aimed to computationally model the hydrous pyrolysis of biomass coupled with an <i>in-situ</i> hydrogen generation process. The kinetics of the water-gas shift (WGS) were determined experimentally and modeled using an ordinary differential equation subroutine coupled with a nonlinear regression. A computational fluid dynamic (CFD) model of biomass fast pyrolysis was developed to simulate conventional fast pyrolysis. The final part of this project adapted the CFD model to simulate hydrous pyrolysis and incorporate the determined WGS kinetics. The bio-oil was deoxygenated via a global lumped hydrodeoxygenation (HDO) kinetic scheme.This WGS was determined to have an agreement with both an empirical power law and a Langmuir-Hinselwood mechanism at conditions similar to that of pyrolysis. The CO conversion reached a maximum value of 94% at higher temps and larger amounts of catalyst. The CFD model of fast pyrolysis predicted a maximum bio-oil yield of 47%, but significantly under-predicted the amount of water present in the oil. The hydrous pyrolysis simulations have not yet reached steady-state and the HDO reactions are just beginning to take place. Further work is needed to explore more detailed kinetic schemes for the secondary pyrolysis reactions as well as the hydrodeoxygenation kinetics. Advisors/Committee Members: Nourredine H. Abdoulmoumine, Douglas G. Hayes, Nicole Labbe.

Subjects/Keywords: Biomass; bio-oil; computational fluid dynamics; hydrous pyrolysis; water gas shift

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Houston, R. W. (2018). Computational Fluid Dynamic Modeling of Catalytic Hydrous Pyrolysis of Biomass to Produce Refinery-Ready Bio-Crude Oil. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/5122

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Houston, Ross Wesley. “Computational Fluid Dynamic Modeling of Catalytic Hydrous Pyrolysis of Biomass to Produce Refinery-Ready Bio-Crude Oil.” 2018. Thesis, University of Tennessee – Knoxville. Accessed November 15, 2019. https://trace.tennessee.edu/utk_gradthes/5122.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Houston, Ross Wesley. “Computational Fluid Dynamic Modeling of Catalytic Hydrous Pyrolysis of Biomass to Produce Refinery-Ready Bio-Crude Oil.” 2018. Web. 15 Nov 2019.

Vancouver:

Houston RW. Computational Fluid Dynamic Modeling of Catalytic Hydrous Pyrolysis of Biomass to Produce Refinery-Ready Bio-Crude Oil. [Internet] [Thesis]. University of Tennessee – Knoxville; 2018. [cited 2019 Nov 15]. Available from: https://trace.tennessee.edu/utk_gradthes/5122.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Houston RW. Computational Fluid Dynamic Modeling of Catalytic Hydrous Pyrolysis of Biomass to Produce Refinery-Ready Bio-Crude Oil. [Thesis]. University of Tennessee – Knoxville; 2018. Available from: https://trace.tennessee.edu/utk_gradthes/5122

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Notre Dame

6. John Clay. Comparison of Palladium and Platinum Water Gas Shift Kinetics Using Density Functional Theory Models</h1>.

Degree: PhD, Chemical and Biomolecular Engineering, 2014, University of Notre Dame

URL: https://curate.nd.edu/show/ks65h992161

► The Water Gas Shift (WGS) reaction can be either thermodynamically or kinetically limited, depending on process conditions. Improved catalysts are of particular interest at… (more)

▼ The Water Gas Shift (WGS) reaction can be either thermodynamically or kinetically limited, depending on process conditions. Improved catalysts are of particular interest at low temperatures where kinetic limitations dominate. In this work, density functional theory calculations were performed to calculate the binding energies, reaction energies, and activation barriers for the proposed WGS pathways on Pt and Pd(111). In addition to the previously published pathways, a new reaction involving the concerted formation of the carboxyl intermediate from water and CO is introduced. In general, binding energies and reaction energies are close on both surfaces. However, Pt has lower activation barriers. Since CO is important for WGS, the CO-CO interactions on Pd(111) were studied by the development of a cluster expansion. A cluster expansion is a polynomial function that allows for rapid prediction of the energy if a structure is given. At low coverages, CO adsorbs in HCP Hollow sites. As the CO coverage increases, CO begins to adsorb in FCC Hollow and Atop sites until the saturation coverage of ¾ ML. Next grand canonical Monte Carlo simulations were performed to determine the coverage-dependent binding energy and temperature programmed desorption spectrum. Finally, a kinetic model was developed to analyze the different WGS reaction pathways, and metals. On both the Pt and Pd surfaces, WGS proceeds through the carboxyl intermediate with water dissociation being the rate determining step, but yields an unfavorably high CO coverage. Next, a coverage dependent binding energy of CO was included in the kinetic model. As the CO binding energy becomes less exothermic, WGS still proceeds through the carboxyl intermediate but carboxyl formation becomes rate determining. Also, the kinetic model shows that Pt is more active than Pd, independent of the CO binding energy. However, the calculated apparent activation barriers and rates do not agree with the experimental results of Pt and Pd supported on Al2O3, which suggest that the support plays an active role in catalyzing the WGS reaction. Since the support plays an important role in WGS catalysis, future studies should attempt to understand the promoting effect of the support and the support-metal interaction. Advisors/Committee Members: W. Nicholas Delgass, Committee Member, Steven Corcelli, Committee Member, William F. Schneider, Committee Chair, Jeffery Kantor, Committee Member.

Subjects/Keywords: Density Functional Theory; Kinetic Modeling; Pt; Pd; Water Gas Shift

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Clay, J. (2014). Comparison of Palladium and Platinum Water Gas Shift Kinetics Using Density Functional Theory Models</h1>. (Doctoral Dissertation). University of Notre Dame. Retrieved from https://curate.nd.edu/show/ks65h992161

Chicago Manual of Style (16^th Edition):

Clay, John. “Comparison of Palladium and Platinum Water Gas Shift Kinetics Using Density Functional Theory Models</h1>.” 2014. Doctoral Dissertation, University of Notre Dame. Accessed November 15, 2019. https://curate.nd.edu/show/ks65h992161.

MLA Handbook (7^th Edition):

Clay, John. “Comparison of Palladium and Platinum Water Gas Shift Kinetics Using Density Functional Theory Models</h1>.” 2014. Web. 15 Nov 2019.

Vancouver:

Clay J. Comparison of Palladium and Platinum Water Gas Shift Kinetics Using Density Functional Theory Models</h1>. [Internet] [Doctoral dissertation]. University of Notre Dame; 2014. [cited 2019 Nov 15]. Available from: https://curate.nd.edu/show/ks65h992161.

Council of Science Editors:

Clay J. Comparison of Palladium and Platinum Water Gas Shift Kinetics Using Density Functional Theory Models</h1>. [Doctoral Dissertation]. University of Notre Dame; 2014. Available from: https://curate.nd.edu/show/ks65h992161

Purdue University

7. Mehta, Dhairya Dilip. Kinetic Studies of Model Reactions to Transform Biomass into Fuels.

Degree: PhD, Chemical Engineering, 2014, Purdue University

URL: https://docs.lib.purdue.edu/open_access_dissertations/1066

► Second-generation biofuels utilizing lignocellulosic biomass are considered to be a promising alternative to fossil-based fuels. Lignocellulosic biomass is structurally diverse and therefore requires detailed understanding… (more)

Subjects/Keywords: Catalysis; Hydrodeoxygenation; Hydropyrolysis; Kinetics; liquid water gas shift; Pt bimetallic

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mehta, D. D. (2014). Kinetic Studies of Model Reactions to Transform Biomass into Fuels. (Doctoral Dissertation). Purdue University. Retrieved from https://docs.lib.purdue.edu/open_access_dissertations/1066

Chicago Manual of Style (16^th Edition):

Mehta, Dhairya Dilip. “Kinetic Studies of Model Reactions to Transform Biomass into Fuels.” 2014. Doctoral Dissertation, Purdue University. Accessed November 15, 2019. https://docs.lib.purdue.edu/open_access_dissertations/1066.

MLA Handbook (7^th Edition):

Mehta, Dhairya Dilip. “Kinetic Studies of Model Reactions to Transform Biomass into Fuels.” 2014. Web. 15 Nov 2019.

Vancouver:

Mehta DD. Kinetic Studies of Model Reactions to Transform Biomass into Fuels. [Internet] [Doctoral dissertation]. Purdue University; 2014. [cited 2019 Nov 15]. Available from: https://docs.lib.purdue.edu/open_access_dissertations/1066.

Council of Science Editors:

Mehta DD. Kinetic Studies of Model Reactions to Transform Biomass into Fuels. [Doctoral Dissertation]. Purdue University; 2014. Available from: https://docs.lib.purdue.edu/open_access_dissertations/1066

Purdue University

8. Mehta, Dhairya Dilip. Kinetic Studies of Model Reactions to Transform Biomass into Fuels.

Degree: PhD, Chemical Engineering, 2014, Purdue University

URL: https://docs.lib.purdue.edu/open_access_dissertations/1057

► Second-generation biofuels utilizing lignocellulosic biomass are considered to be a promising alternative to fossil-based fuels. Lignocellulosic biomass is structurally diverse and therefore requires detailed… (more)

Subjects/Keywords: Catalysis; Hydrodeoxygenation; Hydropyrolysis; Kinetics; liquid water gas shift; Pt bimetallic

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mehta, D. D. (2014). Kinetic Studies of Model Reactions to Transform Biomass into Fuels. (Doctoral Dissertation). Purdue University. Retrieved from https://docs.lib.purdue.edu/open_access_dissertations/1057

Chicago Manual of Style (16^th Edition):

Mehta, Dhairya Dilip. “Kinetic Studies of Model Reactions to Transform Biomass into Fuels.” 2014. Doctoral Dissertation, Purdue University. Accessed November 15, 2019. https://docs.lib.purdue.edu/open_access_dissertations/1057.

MLA Handbook (7^th Edition):

Mehta, Dhairya Dilip. “Kinetic Studies of Model Reactions to Transform Biomass into Fuels.” 2014. Web. 15 Nov 2019.

Vancouver:

Mehta DD. Kinetic Studies of Model Reactions to Transform Biomass into Fuels. [Internet] [Doctoral dissertation]. Purdue University; 2014. [cited 2019 Nov 15]. Available from: https://docs.lib.purdue.edu/open_access_dissertations/1057.

Council of Science Editors:

Mehta DD. Kinetic Studies of Model Reactions to Transform Biomass into Fuels. [Doctoral Dissertation]. Purdue University; 2014. Available from: https://docs.lib.purdue.edu/open_access_dissertations/1057

The Ohio State University

9. Zou, Jian. Carbon dioxide-selective membranes and their applications in hydrogen processing.

Degree: PhD, Chemical Engineering, 2007, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1173296419

► In this work, new CO₂-selective membranes were synthesized and their applications for fuel cell fuel processing and synthesis gas purification were investigated. In order to… (more)

Subjects/Keywords: Polymer Membrane; Gas Separation; Carbon Dioxide Removal; Membrane Reactor; Hydrogen Processing; Water Gas Shift Reaction

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zou, J. (2007). Carbon dioxide-selective membranes and their applications in hydrogen processing. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1173296419

Chicago Manual of Style (16^th Edition):

Zou, Jian. “Carbon dioxide-selective membranes and their applications in hydrogen processing.” 2007. Doctoral Dissertation, The Ohio State University. Accessed November 15, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1173296419.

MLA Handbook (7^th Edition):

Zou, Jian. “Carbon dioxide-selective membranes and their applications in hydrogen processing.” 2007. Web. 15 Nov 2019.

Vancouver:

Zou J. Carbon dioxide-selective membranes and their applications in hydrogen processing. [Internet] [Doctoral dissertation]. The Ohio State University; 2007. [cited 2019 Nov 15]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1173296419.

Council of Science Editors:

Zou J. Carbon dioxide-selective membranes and their applications in hydrogen processing. [Doctoral Dissertation]. The Ohio State University; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1173296419

10. Huve, Joffrey. Highly selective, active and stable Fischer-Tropsch catalyst using entrapped iron nanoparticles in silicalite-1 : Catalyseur de Fischer-Tropsch hautement sélectif, actif et stable utilisant des nanoparticules de fer encapsulées dans une zéolithe de type Silicalite-1.

Degree: Docteur es, Chimie, 2017, Lyon

URL: http://www.theses.fr/2017LYSE1042

►

L'intérêt pour la synthèse de Fischer-Tropsch (FTS) est d'actualité. Elle permet la conversion de matière première (biomasse) en combustible liquide. Comparés aux catalyseurs à base… (more)

▼

L'intérêt pour la synthèse de Fischer-Tropsch (FTS) est d'actualité. Elle permet la conversion de matière première (biomasse) en combustible liquide. Comparés aux catalyseurs à base de cobalt, ceux à base de fer présentent une désactivation rapide, une activité et une sélectivité faibles en produisant une quantité non désirable de CO2. Après plusieurs décennies d'études, l'origine de ces défauts reste méconnue. Les catalyseurs classiques sont généralement fortement chargés en fer (>70 wt.%) et composés de nombreuses phases empêchant l'établissement d'une relation structure-activité. Il est nécessaire de développer des catalyseurs contenant du fer plus actifs, plus sélectifs et plus stables par une approche rationnelle. La synthèse de nanoparticules de taille contrôlée (3.5 nm) encapsulées dans les murs d'une silicalite-1 creuse ([email protected]) est présentée. L'encapsulation empêche le frittage pendant la synthèse de Fischer-Tropsch, permettant de garder une bonne dispersion du fer. Contrairement aux autres catalyseurs, le catalyseur [email protected] ne produit pas de CO2. L'hydrophobicité de la silicalite-1 est très certainement à l'origine de la non-production de CO2 par inhibition de la réaction directe du gaz à l'eau. On démontre que le catalyseur [email protected] le CO2 en CO par réaction du gaz à l'eau inversée (R-WGS). Afin d'établir une relation structure-activité, des catalyseurs à base de fer de taille bien contrôlée sont synthétisés et caractérisés (MET, in-situ XANES, in-situ Mössbauer). Deux catégories de TOF suivant la taille des particules, ~10-2 s-1 pour les plus larges (>20 nm) et ~10-3 s-1 pour les plus petites, sont observées

Fischer-Tropsch synthesis (FTS) is gaining renewed interests as it allows converting alternative feedstocks (biomass) into liquid fuels. Compared to Co-based catalysts, state of the art Fe catalysts show lower activity, faster deactivation and lower selectivity as it produces an undesirable amount of CO2. Despite decades of studies, the origins of low activity and selectivity and fast deactivation are still unclear. Typical Fe based catalysts are highly metal loaded (>70 wt.%) and composed of many different phases, which strongly impedes the establishment of structure-activity relationships. There is a need to develop more active, more selective and more stable iron FTS catalysts by rational approaches.The synthesis of well-controlled 3.5 nm iron nanoparticles encapsulated in the walls of a hollow-silicalite-1 zeolite ([email protected]) is presented. The encapsulation prevents particle sintering under FTS conditions leading to a high and stable Fe dispersion. The catalyst [email protected] is active and highly selective in FTS. Most importantly, [email protected] does not produce CO2 in contrast to all other Fe-based catalysts. The strong hydrophobicity of the silicalite-1 is likely the origin of the lack of CO2 production by inhibition of the forward WGS reaction. We demonstrated that [email protected] CO2 into…

Advisors/Committee Members: Farrusseng, David (thesis director), Schuurman, Yves (thesis director).

Subjects/Keywords: Fischer-Tropsch synthesis; Water-gas-shift; Activité; Selectivité; Stabilité; TOF; CO2; Fer; Fischer-Tropsch synthesis; Water-gas-shift; Activity; Selectivity; Stability; TOF; CO2; Iron catalyst; 541.395

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Huve, J. (2017). Highly selective, active and stable Fischer-Tropsch catalyst using entrapped iron nanoparticles in silicalite-1 : Catalyseur de Fischer-Tropsch hautement sélectif, actif et stable utilisant des nanoparticules de fer encapsulées dans une zéolithe de type Silicalite-1. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2017LYSE1042

Chicago Manual of Style (16^th Edition):

Huve, Joffrey. “Highly selective, active and stable Fischer-Tropsch catalyst using entrapped iron nanoparticles in silicalite-1 : Catalyseur de Fischer-Tropsch hautement sélectif, actif et stable utilisant des nanoparticules de fer encapsulées dans une zéolithe de type Silicalite-1.” 2017. Doctoral Dissertation, Lyon. Accessed November 15, 2019. http://www.theses.fr/2017LYSE1042.

MLA Handbook (7^th Edition):

Huve, Joffrey. “Highly selective, active and stable Fischer-Tropsch catalyst using entrapped iron nanoparticles in silicalite-1 : Catalyseur de Fischer-Tropsch hautement sélectif, actif et stable utilisant des nanoparticules de fer encapsulées dans une zéolithe de type Silicalite-1.” 2017. Web. 15 Nov 2019.

Vancouver:

Huve J. Highly selective, active and stable Fischer-Tropsch catalyst using entrapped iron nanoparticles in silicalite-1 : Catalyseur de Fischer-Tropsch hautement sélectif, actif et stable utilisant des nanoparticules de fer encapsulées dans une zéolithe de type Silicalite-1. [Internet] [Doctoral dissertation]. Lyon; 2017. [cited 2019 Nov 15]. Available from: http://www.theses.fr/2017LYSE1042.

Council of Science Editors:

Huve J. Highly selective, active and stable Fischer-Tropsch catalyst using entrapped iron nanoparticles in silicalite-1 : Catalyseur de Fischer-Tropsch hautement sélectif, actif et stable utilisant des nanoparticules de fer encapsulées dans une zéolithe de type Silicalite-1. [Doctoral Dissertation]. Lyon; 2017. Available from: http://www.theses.fr/2017LYSE1042

Cleveland State University

11. Lang, Mason J. CATALYTIC WASTE GASIFICATION: WATER-GAS SHIFT & SELECTIVITY OFOXIDATION FOR POLYETHYLENE.

Degree: MSin Chemical Engineering, Washkewicz College of Engineering, 2019, Cleveland State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=csu1560982761165342

► As landfills approach capacity and take up valuable land space, metropolitan areas have realized the need for waste disposal alternatives. Thus, there has been a… (more)

▼ As landfills approach capacity and take up valuable land space, metropolitan areas have realized the need for waste disposal alternatives. Thus, there has been a widespread use of waste incinerators in Europe and the United States [1]; [2]. Although newer technology has made incinerators more efficient, there is an increasing interest in formulating `greener’ alternatives to incinerators. Gasification converts organic and carbonaceous materials into a combination of gaseous products known as “syngas,” or synthetic gas. This process greatly reduces the amount of hazardous emissions. The syngas produced by gasifiers has a wide range of uses, including their conversion into diesel, ethanol, methane, methanol and other synthetic fuels [3]. This research consists on an experimental assessment of Low-Temperature Wet Thermal Oxidation (WTO) [4] as a waste management alternative. Detailed experimental assessment and preliminary modeling of gasification technology to process polymeric waste into supply gas is completed here for a model polymer. While catalytic gasification of waste polymers has significance in a variety of engineering applications, it is of particular relevance to in-situ resource utilization (ISRU) and waste management in space exploration beyond low earth orbit (LEO).The substrates studied in our laboratory, Polyethylene and Cellulose, are both long chain organic polymers, and make up a substantial portion of both space and municipal waste composition. Although similar in nature, these substrates exhibit marked differences as it pertains to gasification and were therefore selected as model substrates.Experiments performed on polyethylene over a 5 wt% ruthenium catalyst supported by alumina are reported and analyzed in this paper. Analysis of gaseous products using a gas chromatograph with thermal conductivity detection provided data reflecting the conjunctive performance of all reactions. Application of reaction engineering parameter definitions and experimental data enabled the development of a model for the selectivity of reaction products. Kinetic parameters for the oxidation reactions of polyethylene were retrieved. This kinetic information, complemented by the kinetics of the gas-phase reactions (cf. Lange et al., 2018, and Lang et al., 2019), provide the foundation for a phenomenological model for the gasification of solid waste for sustainable living environments. Advisors/Committee Members: Gatica, Jorge (Advisor).

Subjects/Keywords: Chemical Engineering; Sustainability; Gasification; Environmental; Sustainability; Oxidation; Gasification Selectivity; Catalytic Gasification; Reaction Engineering; Chemical Engineering; Water-Gas Shift; Liquid-phase reactions; Reaction Kinetics; Water-Gas Shift Kinetics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lang, M. J. (2019). CATALYTIC WASTE GASIFICATION: WATER-GAS SHIFT & SELECTIVITY OFOXIDATION FOR POLYETHYLENE. (Masters Thesis). Cleveland State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=csu1560982761165342

Chicago Manual of Style (16^th Edition):

Lang, Mason J. “CATALYTIC WASTE GASIFICATION: WATER-GAS SHIFT & SELECTIVITY OFOXIDATION FOR POLYETHYLENE.” 2019. Masters Thesis, Cleveland State University. Accessed November 15, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=csu1560982761165342.

MLA Handbook (7^th Edition):

Lang, Mason J. “CATALYTIC WASTE GASIFICATION: WATER-GAS SHIFT & SELECTIVITY OFOXIDATION FOR POLYETHYLENE.” 2019. Web. 15 Nov 2019.

Vancouver:

Lang MJ. CATALYTIC WASTE GASIFICATION: WATER-GAS SHIFT & SELECTIVITY OFOXIDATION FOR POLYETHYLENE. [Internet] [Masters thesis]. Cleveland State University; 2019. [cited 2019 Nov 15]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=csu1560982761165342.

Council of Science Editors:

Lang MJ. CATALYTIC WASTE GASIFICATION: WATER-GAS SHIFT & SELECTIVITY OFOXIDATION FOR POLYETHYLENE. [Masters Thesis]. Cleveland State University; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=csu1560982761165342

12. Renata Uema Ribeiro. Nanopartículas de Pt suportadas em Al2O3 e CeO2-Al2O3: síntese e caracterização de catalisadores aplicados à reação de deslocamento gás-água.

Degree: 2011, Universidade Federal de São Carlos

URL: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=5114

►

Nanopartículas de Pt foram preparadas seguindo um procedimento adaptado de Song e colaboradores [1], cuja metodologia consistiu na redução química do ácido hexacloroplatinico pelo etilenoglicol… (more)

▼

Nanopartículas de Pt foram preparadas seguindo um procedimento adaptado de Song e colaboradores [1], cuja metodologia consistiu na redução química do ácido hexacloroplatinico pelo etilenoglicol em meio básico, porém utilizando duas razões PVP/Pt = 0,2 e 10. Ambas as razões levaram a nanopartículas de Pt com tamanho similar (2,0 e 2,8 nm) e monodispersas. As soluções coloidais de nanoparticulas de Pt foram incorporada à alumina durante a síntese sol-gel e mostraram diferentes estabilidades quando submetidas a tratamentos térmicos em ar sintético, He e H2. A razão PVP/Pt utilizada na síntese das partículas foi o fator determinante na estabilidade das partículas no suporte. A adição de uma menor razão PVP/Pt levou a aglomeração das partículas durante a calcinação em ar sintético. Por outro lado, quando um excesso de PVP foi utilizado durante a síntese das partículas as mesmas se mostraram estáveis e dispersas no suporte quando submetidas ao mais severo tratamento. Isto foi relacionado ao ancoramento das partículas ao suporte durante a etapa de incorporação. Nanocatalisadores de Pt suportados em alumina e cério-alumina apresentaram atividade catalítica para a reação de deslocamento gás-água. Dados de conversão do CO indicaram que o aumento no teor de CeO2 de 12 para 20% levou a um aumento na atividade catalítica. Medidas de XPS após a etapa de pré-tratamento em H2 confirmaram a presença de Pt+na superfície dos catalisadores contendo ceria, sugerindo alguma interação metal-suporte. Técnicas de caracterização in situ possibilitaram um melhor entendimento do mecanismo das espécies envolvidas no mecanismo da reação de deslocamento gás-água. Medidas de XANES in situ na borda da Pt confirmaram a presença de Pt reduzida durante o curso da reação para todos os catalisadores, o que sugere a presença de sítios de Pt com densidade eletrônica similar. Isto também foi observado nas medidas de DRIFTS do CO adsorvido para os catalisadores estudados. No entanto, os espectros de XANES na borda do Ce confirmaram mudanças no estado de oxidação do Ce no decorrer da reação, indicando a ocorrência do mecanismo de reação redox, mediado pela ceria. Experimentos utilizando DRIFTS in situ identificaram pequenas concentrações de espécies do tipo formiatos e carbonatos na superfície dos catalisadores durante a reação, sugerindo que mais de um mecanismo pode ocorrer simultaneamente. Palavras chave: nanoparticulas, Platina, catalisador, reação de deslocamento gás-água, PVP.

Colloidal Pt nanoparticles were synthesized according to an adapted procedure from Song and co-workers [1], which it was based on the reduction of dihydrogen hexachloroplatinate by ethylene glycol in a basic solution, but using two PVP/Pt = 0,2 and 10 ratio. Both the ratio lead to monodisperse platinum nanoparticles with similar sizes (2.0 and 2.8 nm). Colloidal Pt nanoparticles solutions were incorporated into alumina during sol-gel synthesis and showed different stabilities when submitted to thermal treatment in synthetic air, He and H2 atmospheres. PVP/Pt…

Advisors/Committee Members: José Maria Corrêa Bueno.

Subjects/Keywords: ENGENHARIA QUIMICA; Catálise; Nanopartículas; Platina; Catalisadores; Nanoparticles; Platinum; Catalyst; Water gas shift reacion; PVP

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ribeiro, R. U. (2011). Nanopartículas de Pt suportadas em Al2O3 e CeO2-Al2O3: síntese e caracterização de catalisadores aplicados à reação de deslocamento gás-água. (Thesis). Universidade Federal de São Carlos. Retrieved from http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=5114

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ribeiro, Renata Uema. “Nanopartículas de Pt suportadas em Al2O3 e CeO2-Al2O3: síntese e caracterização de catalisadores aplicados à reação de deslocamento gás-água.” 2011. Thesis, Universidade Federal de São Carlos. Accessed November 15, 2019. http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=5114.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ribeiro, Renata Uema. “Nanopartículas de Pt suportadas em Al2O3 e CeO2-Al2O3: síntese e caracterização de catalisadores aplicados à reação de deslocamento gás-água.” 2011. Web. 15 Nov 2019.

Vancouver:

Ribeiro RU. Nanopartículas de Pt suportadas em Al2O3 e CeO2-Al2O3: síntese e caracterização de catalisadores aplicados à reação de deslocamento gás-água. [Internet] [Thesis]. Universidade Federal de São Carlos; 2011. [cited 2019 Nov 15]. Available from: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=5114.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ribeiro RU. Nanopartículas de Pt suportadas em Al2O3 e CeO2-Al2O3: síntese e caracterização de catalisadores aplicados à reação de deslocamento gás-água. [Thesis]. Universidade Federal de São Carlos; 2011. Available from: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=5114

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

The Ohio State University

13. Huang, Jin. CO₂(H₂S) membrane separations and WGS membrane reactor modeling for fuel cells.

Degree: PhD, Chemical Engineering, 2007, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1166640509

► Acid-gas removal is of great importance in many environmental or energy-related processes. Compared to current commercial technologies, membrane-based CO₂and H₂S capture has the advantages… (more)

Subjects/Keywords: Carbon Dioxide; Hydrogen Sulfide; Membrane; Facilitated Transport; Water-gas-shift; Membrane reactor; Modeling; Fuel Cell

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Huang, J. (2007). CO₂(H₂S) membrane separations and WGS membrane reactor modeling for fuel cells. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1166640509

Chicago Manual of Style (16^th Edition):

Huang, Jin. “CO₂(H₂S) membrane separations and WGS membrane reactor modeling for fuel cells.” 2007. Doctoral Dissertation, The Ohio State University. Accessed November 15, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1166640509.

MLA Handbook (7^th Edition):

Huang, Jin. “CO₂(H₂S) membrane separations and WGS membrane reactor modeling for fuel cells.” 2007. Web. 15 Nov 2019.

Vancouver:

Huang J. CO₂(H₂S) membrane separations and WGS membrane reactor modeling for fuel cells. [Internet] [Doctoral dissertation]. The Ohio State University; 2007. [cited 2019 Nov 15]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1166640509.

Council of Science Editors:

Huang J. CO₂(H₂S) membrane separations and WGS membrane reactor modeling for fuel cells. [Doctoral Dissertation]. The Ohio State University; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1166640509

University of Cincinnati

14. Tang, Zhong. Synthesis and Modification of MFI-Type Zeolite Membranes for High Temperature Hydrogen Separation and Water Gas Shift Membrane Reactions.

Degree: PhD, Engineering and Applied Science: Chemical Engineering, 2010, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1283192205

► The goal of this research is to develop zeolite membranes that can simultaneously provide high H₂ selectivity and high H₂ permeance while possessing adequate… (more)

▼ The goal of this research is to develop zeolite membranes that can simultaneously provide high H₂ selectivity and high H₂ permeance while possessing adequate hydrothermal and chemical resistances for hydrogen separation from fuel gases and WGS reaction at high temperature of 400 to 550°C. This dissertation work consists of three main parts of research including (1) the development of microwave-assisted method for synthesis of MFI zeolite membranes from template free precursors by seeded secondary growth; (2) controlled modification of MFI zeolite channels by chemical deposition and understanding the mechanism of high H2-selectivity against slightly bigger gases with high H2 permeance at elevated temperatures; and (3) the demonstration of high temperature water gas shift reaction (WGS) in the modified MFI zeolite membrane for enhanced CO conversion. Membranes have been synthesized by seeded secondary growth method from a template-free precursor solution containing NaOH, SiO₂, H₂O, and Al₂(SO₄)₃ under conventional and microwave heating methods. The effects of precursor composition and synthesis conditions on the membrane formation and membrane quality have been investigated. The MFI zeolite membranes obtained by seeded secondary from the template-free precursor tend to develop oblique orientation. Gas permeation tests on small molecules, such as H₂ and CO₂, and large molecules, such as SF₆ have shown that the membranes were free of pinholes and contain minimal amount of non-zeolitic intercrystal spaces. The zeolite membranes obtained from template-free precursors do not need a firing for template removal that avoids the risk of defect formation during the template removal process. The microwave synthesis method was found to dramatically reduce the hydrothermal synthesis duration as compared to the traditional heating method, and hence is more energy-efficient. According to the molecular dynamic diffusion theory, the MFI-type zeolite pore size is incapable of obtaining H₂/CO₂ selectivity much high than the Knudsen factor (i.e. 4.7) at high temperature. A new method of on-stream catalytic cracking deposition (CCD) has been developed for MFI zeolite membrane modification to reduce the effective pore opening so that a size discrimination effect can be achieved for H₂ against other small gases like CO₂. The methyldiethoxysilane (MDES) was used as the silane precursor for CCD modification and the MFI zeolite pore size was narrowed from 0.56 nm to ~ 0.33 nm after the modification. The modified membrane obtained a H₂/CO₂ permselectivity as high as 147 at 450°C and the modified structure also showed good thermal stability in the presence of steam. Theoretical analysis based on the molecular dynamic diffusion model has revealed that the dramatically enhanced H₂ selectivity in the modified is due primarily to the reduction of the… Advisors/Committee Members: Dong, Junhang (Committee Chair).

Subjects/Keywords: Chemical Engineering; Hydrogen; Zeolite membrane; Membrane separation; Membrane reactor; Water gas shift

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tang, Z. (2010). Synthesis and Modification of MFI-Type Zeolite Membranes for High Temperature Hydrogen Separation and Water Gas Shift Membrane Reactions. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1283192205

Chicago Manual of Style (16^th Edition):

Tang, Zhong. “Synthesis and Modification of MFI-Type Zeolite Membranes for High Temperature Hydrogen Separation and Water Gas Shift Membrane Reactions.” 2010. Doctoral Dissertation, University of Cincinnati. Accessed November 15, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1283192205.

MLA Handbook (7^th Edition):

Tang, Zhong. “Synthesis and Modification of MFI-Type Zeolite Membranes for High Temperature Hydrogen Separation and Water Gas Shift Membrane Reactions.” 2010. Web. 15 Nov 2019.

Vancouver:

Tang Z. Synthesis and Modification of MFI-Type Zeolite Membranes for High Temperature Hydrogen Separation and Water Gas Shift Membrane Reactions. [Internet] [Doctoral dissertation]. University of Cincinnati; 2010. [cited 2019 Nov 15]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1283192205.

Council of Science Editors:

Tang Z. Synthesis and Modification of MFI-Type Zeolite Membranes for High Temperature Hydrogen Separation and Water Gas Shift Membrane Reactions. [Doctoral Dissertation]. University of Cincinnati; 2010. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1283192205

15. MACIEL, Leonardo José Lins. Processos Catalíticos Associados de Conversão do Gás Natural Em Hidrogênio e Coprodutos .

Degree: 2012, Universidade Federal de Pernambuco

URL: http://repositorio.ufpe.br/handle/123456789/11880

► Produção de hidrogênio de elevadas purezas e coprodutos têm sido objeto de desenvolvimentos de tecnologias usando o gás natural como matéria-prima com processamento catalítico como… (more)

▼ Produção de hidrogênio de elevadas purezas e coprodutos têm sido objeto de desenvolvimentos de tecnologias usando o gás natural como matéria-prima com processamento catalítico como a desidroaromatização (DAM) associada à reforma seca (RSM) em um leito duplo com ocorrência de coprodutos em condições não oxidativas. As produções de hidrogênio previstas objetivam a utilização do monóxido de carbono de efluentes de reformas do gás natural, via reação water gas shift (WGS) e o desenvolvimento de catalisadores avançados de metais preciosos em fases dispersas sobre um suporte. Como objetivo desta pesquisa pode-se citar: i) Desenvolvimento de uma tecnologia usando o gás natural como matéria-prima para produção de hidrogênio de alta pureza, e coprodutos tais como gás de síntese e acetileno como intermediários para formulação de aromáticos, principalmente o benzeno, via desidroaromatização e a reforma seca, em condições não oxidativas, com utilização de reator de leito fixo. ii) Desenvolvimento de novos catalisadores de Pt e Au (formulação e caracterização) e o estudo detalhado dos parâmetros cinéticos, mecanisticos e em diversos suportes e seus efeitos para reação de WGS. Operações de processamento do metano em reator de leito fixo nas condições: 525°C, 550°C, 575°C, 1 atm, 155-180 cm3/min, fração molar Ar :CH4, 0,5:0,5 de metano e argônio para DAM e relação molar Ar :CH4:CO2, 0,57:0,27:0,16 para DAM/RSM. As operações em reator de leito fixo na presença da mistura dos catalisadores (2,60%)Mo-(0,5%)Ru/HZSM e (11,23%)Ni/ -Al2O3, como resultado principal apresentaram uma acentuada produção de acetileno (42,91%) e moderadas produções de hidrogênio e monóxido de carbono (16%-56% H2 e 1,45% CO, 575°C). No processo catalítico de WGS foram estudados catalisadores de platina e ouro em baixas temperaturas (120°C – 300°C) para manter a conversão total de CO nas condições diferenciais abaixo de 10%. O fluxo total de entrada foi mantido constante com uma composição padrão de gás de 6,8% CO, 8,5% CO2, 21,9% H2O e 37,4% H2. A temperatura foi variada numa faixa entre 20° e 30°C, para determinação da energia de ativação aparente. Aplicações de metodologia da cinética de processos catalíticos permitiram estimar valores de baixas energias de ativação (catalisador Pt: 53 kJ/mol – 63 kJ/mol; catalisador Au:11 kJ/mol –95 kJ/mol), os quais confirmaram os bons níveis de atividade dos catalisadores formulados para o processo WGS, com destaque para os catalisadores 2%Pt/TiO2, 2%Au/ZrO2 e 2%Au/TiO2. Advisors/Committee Members: ABREU, Cesar Augusto Moraes de (advisor), BENACHOUR, Mohand (advisor), RIBEIRO, Fabio H (advisor).

Subjects/Keywords: Desidroaromatização; Reforma Seca do Metano; Water Gas Shift; Acetileno; Hidrogênio; Reator de Leito Fixo Diferencial

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

MACIEL, L. J. L. (2012). Processos Catalíticos Associados de Conversão do Gás Natural Em Hidrogênio e Coprodutos . (Thesis). Universidade Federal de Pernambuco. Retrieved from http://repositorio.ufpe.br/handle/123456789/11880

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

MACIEL, Leonardo José Lins. “Processos Catalíticos Associados de Conversão do Gás Natural Em Hidrogênio e Coprodutos .” 2012. Thesis, Universidade Federal de Pernambuco. Accessed November 15, 2019. http://repositorio.ufpe.br/handle/123456789/11880.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

MACIEL, Leonardo José Lins. “Processos Catalíticos Associados de Conversão do Gás Natural Em Hidrogênio e Coprodutos .” 2012. Web. 15 Nov 2019.

Vancouver:

MACIEL LJL. Processos Catalíticos Associados de Conversão do Gás Natural Em Hidrogênio e Coprodutos . [Internet] [Thesis]. Universidade Federal de Pernambuco; 2012. [cited 2019 Nov 15]. Available from: http://repositorio.ufpe.br/handle/123456789/11880.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

MACIEL LJL. Processos Catalíticos Associados de Conversão do Gás Natural Em Hidrogênio e Coprodutos . [Thesis]. Universidade Federal de Pernambuco; 2012. Available from: http://repositorio.ufpe.br/handle/123456789/11880

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Lehigh University

16. Zhu, Minghui. Rational Design of High Temperature Water-Gas Shift Catalysts with Non-Toxic Earth-Abundant Elements.

Degree: PhD, Chemical Engineering, 2017, Lehigh University

URL: https://preserve.lehigh.edu/etd/2914

► The copper promoted chromium-iron oxide has for decades been used as the commercial catalyst for production of H2 via the High Temperature-Water Gas Shift reaction… (more)

▼ The copper promoted chromium-iron oxide has for decades been used as the commercial catalyst for production of H2 via the High Temperature-Water Gas Shift reaction (HT-WGS). The wide operation temperature range, high activity and robust thermostability has made this catalyst the catalyst of choice for HT-WGS. The toxic nature of hexavalent chromium has motivated extensive research to develop non-chromium HT-WGS catalysts. The lack of fundamental understanding of this HT-WGS catalyst system (catalyst structure under working conditions, reaction mechanism and copper/chromium promotion mechanism), however, have hampered the developed of Cr-free catalysts. The objectives of the dissertation were (1) to resolve the fundamentals of copper and chromium promotion mechanisms for the HT-WGS reaction, and (2) then apply the new fundamental insights to guide the rational design of chromium-free iron oxide-based HT-WGS catalysts. Temperature programmed surface reaction (TPSR) was employed to resolve the decades long debate regarding the HT-WGS reaction mechanism on iron oxide-based catalysts. Isotope C16O2/C18O2 switch experiments provided insights on the nature of active sites and the participation of surface oxygen, which allowed for the first time to calculate the Turnover Frequency (TOF) of iron oxide-based HT-WGS catalysts. To understand the structure of copper promoted chromium-iron oxide catalyst under reaction condition, a series of modern characterization techniques were employed (XRD, in situ Raman spectroscopy, Near Ambient Pressure X-ray Photoelectron Spectroscopy (NAP-XPS), High-Sensitivity Low-Energy Ion Scattering (HS-LEIS) Spectroscopy, in situ X-ray Absorption Spectroscopy and TEM-EDX). The activated catalysts were chemically probed with CO-Temperature Programmed Reduction (TPR) to examine the effects of copper and chromium on the catalyst activity for removing oxygen by CO, which is the rate-determining-step. These findings provided critical insights into the promotion mechanisms of copper and chromium. Finally, based on the fundamental understanding of the existing commercial catalysis system, new chromium-free, environmentally friendly iron oxide based HT-WGS catalysts were rationally designed. Advisors/Committee Members: Wachs, Israel E..

Subjects/Keywords: Catalysis; High Temperature; Hydrogen; Iron Based; Redox Mechanism; Water-Gas Shift; Chemical Engineering; Engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhu, M. (2017). Rational Design of High Temperature Water-Gas Shift Catalysts with Non-Toxic Earth-Abundant Elements. (Doctoral Dissertation). Lehigh University. Retrieved from https://preserve.lehigh.edu/etd/2914

Chicago Manual of Style (16^th Edition):

Zhu, Minghui. “Rational Design of High Temperature Water-Gas Shift Catalysts with Non-Toxic Earth-Abundant Elements.” 2017. Doctoral Dissertation, Lehigh University. Accessed November 15, 2019. https://preserve.lehigh.edu/etd/2914.

MLA Handbook (7^th Edition):

Zhu, Minghui. “Rational Design of High Temperature Water-Gas Shift Catalysts with Non-Toxic Earth-Abundant Elements.” 2017. Web. 15 Nov 2019.

Vancouver:

Zhu M. Rational Design of High Temperature Water-Gas Shift Catalysts with Non-Toxic Earth-Abundant Elements. [Internet] [Doctoral dissertation]. Lehigh University; 2017. [cited 2019 Nov 15]. Available from: https://preserve.lehigh.edu/etd/2914.

Council of Science Editors:

Zhu M. Rational Design of High Temperature Water-Gas Shift Catalysts with Non-Toxic Earth-Abundant Elements. [Doctoral Dissertation]. Lehigh University; 2017. Available from: https://preserve.lehigh.edu/etd/2914

University of Cincinnati

17. Chakraborty, Arundhoti. Development of Copper Catalysts for the Reduction of Polar Bonds.

Degree: PhD, Arts and Sciences: Chemistry, 2016, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479814963555246

► This thesis focuses on the synthesis of new transition metal complexes that show metal–metal cooperativity and metal-ligand cooperativity. Late-late and early-late heterobimetallic complexes have been… (more)

▼ This thesis focuses on the synthesis of new transition metal complexes that show metal–metal cooperativity and metal-ligand cooperativity. Late-late and early-late heterobimetallic complexes have been synthesized and employed in important chemical transformations like benzaldehyde (PhCHO) reduction under water-gas shift reaction (WGSR) conditions and reduction of an imine moiety respectively. A bifunctional hexameric copper hydride complex has also been isolated and utilized in the catalytic hydrogenation of aldehydes, ketones and CO2.I have synthesized late-late heterobimetallic complexes containing Fe–Cu bonds where the iron center is supported by a Knolker-type cyclopentadienone ligand and the copper center is ligated to a N-heterocyclic carbene. Reactions between the Knolker’s iron tricarbonyl complexes (SiMe3 and tBu derivatives) and (IPr)CuOH lead to the formation of new Fe/Cu heterobimetallic complexes that contain a bridging hydride in the solid state. Solution IR, ¹³C{¹H} NMR analysis and variable temperature NMR suggest a dominant terminal iron hydride structure in solution for the SiMe3 derivative.Stoichiometric reactions of these Fe/Cu complexes with alkyl halides lead to the formation of new Fe/Cu halide complexes. Under a CO atmosphere, these Fe/Cu complexes generate the corresponding iron tricarbonyl species and the dimeric (IPr)CuH complex. Reduction of PhCHO to PhCH2OH was successfully performed under water-gas shift reaction conditions. Both metal centers are necessary to carry out the reaction demonstrating the importance of metal-metal cooperativity. Isotope labelling studies performed with ¹³CO confirmed that the Fe/Cu catalyst is indeed active in WGSR. In my second project I have synthesized and isolated a new copper hydride supported by a bis(phosphine)amine [iPrPN(H)P] ligand with a hexameric copper core. The assignment of the hydride peak in the ¹H NMR spectrum was confirmed by comparing the ¹H NMR spectrum of the related copper deuteride complex. Benzaldehyde and acetophenone insert into the Cu-H bond to afford the corresponding copper alkoxide products. CO2 also undergoes a facile insertion into the Cu-H bond to form the corresponding copper formate species. Isotope labelling study indicates that the insertion is reversible but favors the formation of copper formate. Hydrogenation of aldehydes, ketones and CO2 has been carried out with the copper bromide precursor under mild conditions. The copper hydride complex also serves as an effective catalyst in the hydrogenation of benzaldehyde implying its direct involvement in the catalytic reaction. Catalytic inactivity of the copper bromide species containing the [iPr(PN(Me)P] ligand in the hydrogenation reaction implies a bifunctional mechanism; however, further investigation is needed to support this mechanism.My third project focuses on the synthesis of early-late heterobimetallic complexes containing Cr–Cu bonds and the respective metal centers are supported by bulky Cp* (Cp* = 1,2,3,4,5-cyclopentadienyl) and… Advisors/Committee Members: Guan, Hairong (Committee Chair).

Subjects/Keywords: Chemistry; Organometallic Chemistry; cooperativity; heterobimetallic complexes; iron and copper catalysis; Water-Gas Shift Reaction; hydrogenation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chakraborty, A. (2016). Development of Copper Catalysts for the Reduction of Polar Bonds. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479814963555246

Chicago Manual of Style (16^th Edition):

Chakraborty, Arundhoti. “Development of Copper Catalysts for the Reduction of Polar Bonds.” 2016. Doctoral Dissertation, University of Cincinnati. Accessed November 15, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479814963555246.

MLA Handbook (7^th Edition):

Chakraborty, Arundhoti. “Development of Copper Catalysts for the Reduction of Polar Bonds.” 2016. Web. 15 Nov 2019.

Vancouver:

Chakraborty A. Development of Copper Catalysts for the Reduction of Polar Bonds. [Internet] [Doctoral dissertation]. University of Cincinnati; 2016. [cited 2019 Nov 15]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479814963555246.

Council of Science Editors:

Chakraborty A. Development of Copper Catalysts for the Reduction of Polar Bonds. [Doctoral Dissertation]. University of Cincinnati; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479814963555246

Université de Sherbrooke

18. Paquet, Antonin. Reformage de gaz de synthèse primaire produit par gazéification de biomasse hétérogène .

Degree: 2010, Université de Sherbrooke

URL: http://hdl.handle.net/11143/5523

► Le reformage des gaz primaires de gazéification a été étudié à des températures de 800-1000[degrés Celsius].Le reformage thermique à ces températures a permis de convertir… (more)

Subjects/Keywords: Craquage; Traitement; Water gas shift; Gaz de synthèse; Biomasse; Goudrons; Gazéification; Reformage

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Paquet, A. (2010). Reformage de gaz de synthèse primaire produit par gazéification de biomasse hétérogène . (Masters Thesis). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/5523

Chicago Manual of Style (16^th Edition):

Paquet, Antonin. “Reformage de gaz de synthèse primaire produit par gazéification de biomasse hétérogène .” 2010. Masters Thesis, Université de Sherbrooke. Accessed November 15, 2019. http://hdl.handle.net/11143/5523.

MLA Handbook (7^th Edition):

Paquet, Antonin. “Reformage de gaz de synthèse primaire produit par gazéification de biomasse hétérogène .” 2010. Web. 15 Nov 2019.

Vancouver:

Paquet A. Reformage de gaz de synthèse primaire produit par gazéification de biomasse hétérogène . [Internet] [Masters thesis]. Université de Sherbrooke; 2010. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/11143/5523.

Council of Science Editors:

Paquet A. Reformage de gaz de synthèse primaire produit par gazéification de biomasse hétérogène . [Masters Thesis]. Université de Sherbrooke; 2010. Available from: http://hdl.handle.net/11143/5523

Lehigh University

19. Yalcin, Ozgen. Theoretical And Experimental Investigation Of Water-Gas Shift Reaction Over Supported Copper/iron Oxide Catalysts.

Degree: PhD, Chemical Engineering, 2017, Lehigh University

URL: https://preserve.lehigh.edu/etd/2975

► Industrial hydrogen production from various resources is driven by the worldâs advancement towards a hydrogen economy. The water-gas shift (WGS) catalytic reaction is an intermediate… (more)

▼ Industrial hydrogen production from various resources is driven by the worldâs advancement towards a hydrogen economy. The water-gas shift (WGS) catalytic reaction is an intermediate step between reforming of carbonaceous materials and hydrogen production. This catalytic reaction is important for hydrogen enrichment and carbon monoxide reduction. Copper-supported chromium-iron oxide (Fe3O4-Cr2O3-CuO) is the main catalyst system for the high temperature (HT) WGS redox reaction.Density functional theory calculations were carried out to investigate the role of the chromium and copper, which were demonstrated to act as textural and catalytic promoters, respectively, for the Fe3O4-Cr2O3-CuO catalyst system by in situ experimental studies at the atomic scale. The present study tries to explain the adsorption preferences of CO and H2O molecules on the Feoct2 termination of Fe3O4 (111) surface and the Feoct2 terminated surface that is modified by Cr substitution, adsorption of a Cu4 cluster and also the redox property of the surfaces. There is a minor effect of Cr on the dissociative adsorption of H2O, but no effect on CO adsorption indicating that Cr does not act as a chemical promoter. Copper promotion of the Feoct2 terminated structure with a supported Cu4 cluster facilitates CO adsorption at the new active sites present at the copper-iron oxide interface.Although Cr-Fe oxide-based catalysts are still the cornerstone for high temperature WGS reaction, the environmental and health issues arising from the presence of carcinogenic Cr6+ has motivated this investigation to look for alternative promoters to the toxic chromium. As indicated above from DFT calculations and the experimental literature, chromium functions as a structural promoter that prevents thermal sintering of iron oxide at elevated WGS reaction temperatures. In this study, zirconia-, niobia-, ceria-, and alumina-promoted supported copper/iron oxide catalysts were synthesized and investigated. The prepared catalysts were investigated with ex situ XRD, in situ Raman spectroscopy, High-Sensitivity Low Energy Ion Scattering (LEIS), CO TPR and flow BET surface area. The characterization studies revealed the interplay between the different components of this dynamic catalyst system. The promoted catalysts were found have significantly greater thermostability than the unpromoted iron oxide catalyst. The promoted catalysts without copper did not perform better than the unpromoted iron oxide catalyst for the WGS reaction. The ~3x higher catalytic activity of the supported 3Cu/8CeFe catalyst than the Cu-free 8CeFe catalyst may be due to a strong metal-support interaction between the metallic copper and the CeO2 nanoparticles and Fe3O4 surface. Al promoters provides better thermostability and higher activity. Potentially designed Cr-free catalyst is the combination of BET stability of Al promoter with redox activity of Ce promoter.This research study combines theoretical and experimental investigations under the partnership between Department of Chemical & Biomolecular… Advisors/Committee Members: Wachs, Israel E..

Subjects/Keywords: Cr-free; DFT; iron oxide; Water-gas shift reaction; Biochemical and Biomolecular Engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yalcin, O. (2017). Theoretical And Experimental Investigation Of Water-Gas Shift Reaction Over Supported Copper/iron Oxide Catalysts. (Doctoral Dissertation). Lehigh University. Retrieved from https://preserve.lehigh.edu/etd/2975

Chicago Manual of Style (16^th Edition):

Yalcin, Ozgen. “Theoretical And Experimental Investigation Of Water-Gas Shift Reaction Over Supported Copper/iron Oxide Catalysts.” 2017. Doctoral Dissertation, Lehigh University. Accessed November 15, 2019. https://preserve.lehigh.edu/etd/2975.

MLA Handbook (7^th Edition):

Yalcin, Ozgen. “Theoretical And Experimental Investigation Of Water-Gas Shift Reaction Over Supported Copper/iron Oxide Catalysts.” 2017. Web. 15 Nov 2019.

Vancouver:

Yalcin O. Theoretical And Experimental Investigation Of Water-Gas Shift Reaction Over Supported Copper/iron Oxide Catalysts. [Internet] [Doctoral dissertation]. Lehigh University; 2017. [cited 2019 Nov 15]. Available from: https://preserve.lehigh.edu/etd/2975.

Council of Science Editors:

Yalcin O. Theoretical And Experimental Investigation Of Water-Gas Shift Reaction Over Supported Copper/iron Oxide Catalysts. [Doctoral Dissertation]. Lehigh University; 2017. Available from: https://preserve.lehigh.edu/etd/2975

University of Ottawa

20. Lortie, Maxime. Reverse Water Gas Shift Reaction over Supported Cu-Ni Nanoparticle Catalysts .

Degree: 2014, University of Ottawa

URL: http://hdl.handle.net/10393/31733

► CuNi nanoparticles were synthesized using a new polyol synthesis method. Three different CuxNi1-x catalysts were synthesized where x = 20, 50 and 80. The nanoparticles… (more)

Subjects/Keywords: Reverse Water Gas Shift; Catalysis; Nanoparticle; Copper Nickel Alloy; Oxygen Vacancy; Samarium-Doped Ceria

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lortie, M. (2014). Reverse Water Gas Shift Reaction over Supported Cu-Ni Nanoparticle Catalysts . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/31733

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lortie, Maxime. “Reverse Water Gas Shift Reaction over Supported Cu-Ni Nanoparticle Catalysts .” 2014. Thesis, University of Ottawa. Accessed November 15, 2019. http://hdl.handle.net/10393/31733.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lortie, Maxime. “Reverse Water Gas Shift Reaction over Supported Cu-Ni Nanoparticle Catalysts .” 2014. Web. 15 Nov 2019.

Vancouver:

Lortie M. Reverse Water Gas Shift Reaction over Supported Cu-Ni Nanoparticle Catalysts . [Internet] [Thesis]. University of Ottawa; 2014. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/10393/31733.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lortie M. Reverse Water Gas Shift Reaction over Supported Cu-Ni Nanoparticle Catalysts . [Thesis]. University of Ottawa; 2014. Available from: http://hdl.handle.net/10393/31733

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Ottawa

21. Wilson, Sean M. W. Adsorption Separation of CO2 from CO in Syngas: Improving the Conversion of the Reverse Water Gas Shift Reaction .

Degree: 2015, University of Ottawa

URL: http://hdl.handle.net/10393/33169

► In this research project, adsorption is considered for the separation of CO2 from CO for applications such as industrial syngas production and in particular to… (more)

▼ In this research project, adsorption is considered for the separation of CO2 from CO for applications such as industrial syngas production and in particular to improve the conversion of the Reverse Water Gas Shift (RWGS) process. The use of adsorption technology for these applications requires an adsorbent that can effectively separate out CO2 from a gas mixture containing CO2, CO, and H2. However, adsorption of H2 is insignificant when compared to both CO2 and CO, with only CO2 and CO being the adsorbed species. The adsorption of CO2 and CO was investigated in this work for four major types of industrial adsorbents which include: activated aluminas, activated carbons, silica gels, and zeolites. Zeolites, with their ability to be fine tuned many parameters which may affect adsorption, were investigated in terms of the effect of the cations present, SiO2/Al2O3 ratios, and structure to determine how to optimize adsorption of CO2 while decreasing adsorption of CO. This will help to determine a promising adsorbent for this separation with focus on maximizing the selective adsorption of CO2 over CO. To investigate this separation three scientific experimental methods were used; gravimetric adsorption isotherm analysis, volumetric adsorption isotherm analysis, and packed bed adsorption desorption breakthrough analysis. Gravimetric and volumetric methods allow for testing the adsorbent with the individual species of CO2 and CO. This investigation will let us determine the pure component adsorption capacity, heats of adsorption, regenerability, and basic selectivity. Packed bed adsorption breakthrough experimentation was then carried out on promising adsorbents for the CO2 separation from a mixture of CO2, CO, and H2. These experiments used a gas mixture that would be comparable to that produced from the RWGS reaction to determine the multicomponent gas mixture behaviour for adsorption. Temperature swing adsorption (TSA) with a purge gas stream of H2 was then used to regenerate the adsorbent.

Subjects/Keywords: Carbon Dioxide and Carbon Monoxide Separation; Adsorption; Reverse Water Gas Shift; Syngas

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wilson, S. M. W. (2015). Adsorption Separation of CO2 from CO in Syngas: Improving the Conversion of the Reverse Water Gas Shift Reaction . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/33169

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wilson, Sean M W. “Adsorption Separation of CO2 from CO in Syngas: Improving the Conversion of the Reverse Water Gas Shift Reaction .” 2015. Thesis, University of Ottawa. Accessed November 15, 2019. http://hdl.handle.net/10393/33169.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wilson, Sean M W. “Adsorption Separation of CO2 from CO in Syngas: Improving the Conversion of the Reverse Water Gas Shift Reaction .” 2015. Web. 15 Nov 2019.

Vancouver:

Wilson SMW. Adsorption Separation of CO2 from CO in Syngas: Improving the Conversion of the Reverse Water Gas Shift Reaction . [Internet] [Thesis]. University of Ottawa; 2015. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/10393/33169.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wilson SMW. Adsorption Separation of CO2 from CO in Syngas: Improving the Conversion of the Reverse Water Gas Shift Reaction . [Thesis]. University of Ottawa; 2015. Available from: http://hdl.handle.net/10393/33169

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

22. Ibrahim, Malek Y. S. Carbon monoxide-driven reductive organic transformations and precious metals recycling.

Degree: PhD, Chemical Engineering, 2018, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/102409

► Herein we present the efforts made toward employing the homogeneously-catalyzed Water-Gas Shift Reaction (WGSR) to drive essential reductive chemical transformations, and selectively extract rhodium from… (more)

▼ Herein we present the efforts made toward employing the homogeneously-catalyzed Water-Gas Shift Reaction (WGSR) to drive essential reductive chemical transformations, and selectively extract rhodium from solid waste. The generation of rhodium hydride from the reaction of rhodium carbonyl with water has been achieved at temperatures as low as room temperature when the reaction was performed in a solution of simple tertiary amines in polar solvents. We investigated the mechanism by which this reaction proceeds and studied the effect of the reaction parameters on the ability of rhodium to deliver its hydride to different reducible functional groups e.g. activated alkenes, aldehydes, and ketones. We demonstrated the ability of the WGSR to drive the reductive alkylation of several classes of activated methylene compounds at room temperature. Under catalysis by rhodium trichloride (2–3 mol %), carbon monoxide (10 bar), water (2–50 equiv), and tertiary methyl /ethyl amines (2.5–7 equiv), the scope has been successfully expanded to cover a wide range of alkylating agents, including aliphatic and aromatic aldehydes, as well as cyclic ketones, in moderate to high yields. This method is comparable to, and for certain aspects, surpasses the established reductive alkylation protocols. The reductive amination of aldehydes has been demonstrated to be feasible under the same conditions with the exception of furfurals which undergo a newly-identified, reductive Piancatelli rearrangement to yield 2-enoneamines. A novel Pd/Rh dual‐metallic cooperative catalytic process has been developed to effect the reductive carbonylation of aryl halides in moderate to good yield. In this reaction, water is the hydride source, and CO serves both as the carbonyl source and the terminal reductant through the water–gas shift reaction. The catalytic generation of the Rh hydride allows for the selective formation of highly hindered aryl aldehydes that are inaccessible through previously reported reductive carbonylation protocols. Moreover, aldehydes with deuterated formyl groups can be efficiently and selectively synthesized using D2O as a cost‐effective deuterium source without the need for presynthesizing the aldehyde. Addition of an electrophile e.g. allyl acetate to the reaction resulted in the formation of aryl-vinyl ketones through the WGSR-driven reductive carbonylative coupling. We developed a mild and selective method for rhodium recovery that relies on the use of carbon monoxide to extract rhodium nanoparticles on various supports in polar solvents. Unlike the traditional recycling technologies, this method operates at low temperature and does not require strong acids. Moreover, the CO-induced leaching is complimentary to leaching by acids in terms of selectivity toward rhodium versus other precious metals and results in metal recovery in the form of reduced metallic clusters. The method performs best on freshly reduced surfaces and can be promoted by the addition of tertiary amines. Besides CO gas, formic acid can also be used as a leachant… Advisors/Committee Members: Denmark, Scott E (advisor), Leckband, Deborah E (Committee Chair), Rauchfuss, Thomas B (committee member), Rogers, Simon (committee member).

Subjects/Keywords: Water-Gas Shift; rhodium carbonyl hydride; reductive carbonylation; alkylation; amination; rhodium recycling.

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ibrahim, M. Y. S. (2018). Carbon monoxide-driven reductive organic transformations and precious metals recycling. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/102409

Chicago Manual of Style (16^th Edition):

Ibrahim, Malek Y S. “Carbon monoxide-driven reductive organic transformations and precious metals recycling.” 2018. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed November 15, 2019. http://hdl.handle.net/2142/102409.

MLA Handbook (7^th Edition):

Ibrahim, Malek Y S. “Carbon monoxide-driven reductive organic transformations and precious metals recycling.” 2018. Web. 15 Nov 2019.

Vancouver:

Ibrahim MYS. Carbon monoxide-driven reductive organic transformations and precious metals recycling. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2018. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/2142/102409.

Council of Science Editors:

Ibrahim MYS. Carbon monoxide-driven reductive organic transformations and precious metals recycling. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/102409

Kansas State University

23. Zhou, Mingxia. First-principles based micro-kinetic modeling for catalysts design.

Degree: PhD, Department of Chemical Engineering, 2018, Kansas State University

URL: http://hdl.handle.net/2097/38608

► Efficient and selective catalysis lies at the heart of many chemical reactions, enabling the synthesis of chemicals and fuels with enormous societal and technological impact.… (more)

▼ Efficient and selective catalysis lies at the heart of many chemical reactions, enabling the synthesis of chemicals and fuels with enormous societal and technological impact. A fundamental understanding of intrinsic catalyst properties for effective manipulation of the reactivity and selectivity of industrial catalysts is essential to select proper catalysts to catalyze the reactions we want and hinder the reactions we do not want. The progress in density functional theory (DFT) makes it possible to describe interfacial catalytic reactions and predict catalytic activities from one catalyst to another. In this study, water-gas shift reaction (WGSR) was used as a model reaction. First-principles based micro-kinetic modeling has been performed to deeply understand interactions between competing reaction mechanisms, and the relationship with various factors such as catalyst materials, structures, promoters, and interactions between intermediates (e.g., CO self-interaction) that govern the observed catalytic behaviors. Overall, in this thesis, all relevant reaction mechanisms in the model reaction on well-defined active sites were developed with first-principles calculations. With the established mechanism, the promotional effect of K adatom on Ni(111) on WGSR compared to the competing methanation was understood. Moreover, the WGSR kinetic trend, with the hydrogen production rate decreasing with increasing Ni particle diameters (due to the decreasing fractions of low-coordinated surface Ni site), was reproduced conveniently from micro-kinetic modeling techniques. Empirical correlations such as Brønsted-Evans-Polanyi (BEP) relationship for O-H, and C-O bond formation or cleavage on Ni(111), Ni(100), and Ni(211) were incorporated to accelerate computational analysis and generate trends on other transition metals (e.g., Cu, Au, Pt). To improve the numerical quality of micro-kinetic modeling, later interactions of main surface reaction intermediates were proven to be critical and incorporated successfully into the kinetic models. Finally, evidence of support playing a role in the enhancement of catalyst activity and the impact on future modeling will be discussed. DFT will be a powerful tool for understanding and even predicting catalyst performance and is shaping our approach to catalysis research. Such molecular-level information obtained from computational methods will undoubtedly guide the design of new catalyst materials with high precision. Advisors/Committee Members: Bin Liu.

Subjects/Keywords: Computational catalyst design; Density functional theory; Water-gas shift reaction; Transition metal catalysts

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhou, M. (2018). First-principles based micro-kinetic modeling for catalysts design. (Doctoral Dissertation). Kansas State University. Retrieved from http://hdl.handle.net/2097/38608

Chicago Manual of Style (16^th Edition):

Zhou, Mingxia. “First-principles based micro-kinetic modeling for catalysts design.” 2018. Doctoral Dissertation, Kansas State University. Accessed November 15, 2019. http://hdl.handle.net/2097/38608.

MLA Handbook (7^th Edition):

Zhou, Mingxia. “First-principles based micro-kinetic modeling for catalysts design.” 2018. Web. 15 Nov 2019.

Vancouver:

Zhou M. First-principles based micro-kinetic modeling for catalysts design. [Internet] [Doctoral dissertation]. Kansas State University; 2018. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/2097/38608.

Council of Science Editors:

Zhou M. First-principles based micro-kinetic modeling for catalysts design. [Doctoral Dissertation]. Kansas State University; 2018. Available from: http://hdl.handle.net/2097/38608

University of Waterloo

24. Liu, Kun. Hydrodesulfurization and Hydrodenitrogenation of Model Compounds Using in-situ Hydrogen over Nano-Dispersed Mo Sulfide Based Catalysts.

Degree: 2010, University of Waterloo

URL: http://hdl.handle.net/10012/5614

► Heavy oil derived from oil sands is becoming an important resource of energy and transportation fuels due to the depletion of conventional oil resources. However,… (more)

▼ Heavy oil derived from oil sands is becoming an important resource of energy and transportation fuels due to the depletion of conventional oil resources. However, bitumen and heavy oils have a low hydrogen/carbon ratio and contain a large percentage of sulfur and nitrogen heterocyclic compounds. At the level of deep desulfurization, aromatic poly-nuclear molecules, especially nitrogen-containing heterocyclic compounds, exhibit strong inhibitive effect on hydrodesulfurization (HDS) due to competitive adsorption on catalytically active sites with sulfur-containing molecules. Therefore, it is necessary to study the HDS of refractory sulfur-containing compounds and also the effect of nitrogen-containing species on the deep HDS for achieving the ultra low sulfur specifications for transportation fuels. Additionally, the cost of H2 increased in recent years and a bitumen emulsion upgrading technique using an alternative in-situ H2 generated via the water gas shift (WGS) reaction during the hydro-treating was developed in our group. In the present study, a kind of nano-dispersed unsupported MoSx based catalyst was developed and used for hydrodesulfurization, hydrodenitrogenation (HDN) and upgrading bitumen emulsions. Objectives of this thesis were to (1) improve the catalytic activity of the nano-dispersed Mo based catalysts towards the HDS and HDN reactions of refractory sulfur-/nitrogen-containing compounds; and (2) compare the reactivity of in-situ hydrogen generated via the WGS reaction versus externally provided molecular hydrogen in HDS and HDN reactions to improve the efficiency of the bitumen emulsion upgrading technology developed by our group. In the present study, to stimulate the reaction system of bitumen emulsion, water was added into the organic reaction system, so there are different phases in this reaction system. To investigate the activity of the catalyst, the catalyst particles dispersed in different phases were characterized separatedly via HRTEM-EDX. After HRTEM-EDX study, all phases were mixed up and dried for further characterizations, BET, SEM, and XRD. The catalyst prepared in in-situ hydrogen was found to have higher surface area and smaller particle size than the one made in molecular hydrogen. The presence of sulfur-/nitrogen-containing compounds in the preparation system caused significant changes in the morphology of dispersed Mo sulfide catalyst according to HRTEM observations. Refractory sulfur-containing compounds of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) were used as model compounds in HDS studies. The simultaneous HDS of both model compounds was performed at different reaction temperatures from 330°C to 400°C. The effect of the reaction temperature on the WGS reaction in the presence of sulfur-containing model compounds was reported. A kinetic model for HDS reactions was proposed and used in discussing experiment results. The relative HDS reactivity of 4,6-DMDBT to DBT using dispersed Mo sulfide catalyst in in-situ hydrogen was found to be higher than…

Subjects/Keywords: hydrodesulfurization; hydrodenitrogenation; dibenzothiophene; 4,6-dimethyldibenzothiophene; water gas shift reaction; nano-dispersed catalyst; carbazole

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Liu, K. (2010). Hydrodesulfurization and Hydrodenitrogenation of Model Compounds Using in-situ Hydrogen over Nano-Dispersed Mo Sulfide Based Catalysts. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/5614

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liu, Kun. “Hydrodesulfurization and Hydrodenitrogenation of Model Compounds Using in-situ Hydrogen over Nano-Dispersed Mo Sulfide Based Catalysts.” 2010. Thesis, University of Waterloo. Accessed November 15, 2019. http://hdl.handle.net/10012/5614.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liu, Kun. “Hydrodesulfurization and Hydrodenitrogenation of Model Compounds Using in-situ Hydrogen over Nano-Dispersed Mo Sulfide Based Catalysts.” 2010. Web. 15 Nov 2019.

Vancouver:

Liu K. Hydrodesulfurization and Hydrodenitrogenation of Model Compounds Using in-situ Hydrogen over Nano-Dispersed Mo Sulfide Based Catalysts. [Internet] [Thesis]. University of Waterloo; 2010. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/10012/5614.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu K. Hydrodesulfurization and Hydrodenitrogenation of Model Compounds Using in-situ Hydrogen over Nano-Dispersed Mo Sulfide Based Catalysts. [Thesis]. University of Waterloo; 2010. Available from: http://hdl.handle.net/10012/5614

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brigham Young University

25. Brown, Jared C. UV Visible Spectra Analysis of High Temperature Water Gas Shift Catalysts Made from Iron, Lanthanum, Copper, and Chromium Oxides.

Degree: MS, 2012, Brigham Young University

URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4221&context=etd

► Hydrogen is a vital component in several different chemical reactions as well as a potential fuel source for the future. The water gas shift (WGS)… (more)

▼ Hydrogen is a vital component in several different chemical reactions as well as a potential fuel source for the future. The water gas shift (WGS) reaction converts CO and water to hydrogen and CO2. The objective of this work is to first, characterize the potential benefits of the addition of lanthanum oxide (lanthana) to the iron-chromium-copper (Fe-Cr-Cu) oxide catalysts industrially used in high temperature water gas shift processes, and second, analyze these catalysts using in-situ UV-Visible spectroscopy. The benefits of each component in the catalyst are discussed as well as potential benefits from the addition of lanthana. Lanthana is a rare earth oxide that dramatically increases the surface area of the iron based WGS catalysts, and small concentrations of other rare earth oxides (i.e. cerium) have been shown to increase the rate of desorption of CO2 from iron surfaces (Hu Yanping 2002). Lanthana has similar chemical properties to other rare earth oxides tested and has not been previously tested as an additive to the WGS catalyst. Therefore catalysts with 0, 1, 2, 5, 10, and 20 wt% lanthana were made via a co-precipitation method in order to measure changes in activity, physical stability, and thermal stability. Catalyst characterization techniques utilized include electron dispersive X-ray spectroscopy (EDX), temperature programmed reduction (TPR) with hydrogen, and nitrogen physisorption (BET). The kinetic analysis was performed utilizing both mass spectroscopy (MS) and gas chromatography (GC). The addition of 1 wt% lanthana to the Fe-Cr-Cu catalysts increases WGS reaction rates of the catalyst at 425°C and 350°C, however the 0% La catalyst has the highest rates at 375°C and 400°C. The 0% La catalyst shows significant drop off in rate at 425°C, suggesting that the lanthana provides a small thermal stabilizing, i.e. the addition of lanthana prevents catalyst sintering at higher temperatures. Traditionally, chromia acts as the sole thermal stabilizer in these catalysts. The addition of large amounts of lanthana inhibits the chromia stabilizing effect, however small additions of lanthana appear to have an additional catalyst promotional effect without interfering with the chromia thermal stabilization. The increased WGS reaction rates at higher temperatures could allow for greater throughput of reactants in industrial settings. Higher concentrations of lanthana decrease the activity due to what is believed to be disruption of the chromia stabilizing effect as well as reduced amount of the active phase of catalyst. In-situ UV-Visible analysis shows that the oxidation state of the iron in the catalyst has a direct correlation to the UV-Visible light absorbance of the surface of the iron catalyst. Extent of reduction is traditionally measured with a synchrotron which is significantly more expensive than UV-Vis spectroscopy. This study uses the more economical UV-Vis spectrometer to determine similar information. The lanthana doped catalysts show an over-reduction of iron during WGS conditions (i.e. rapid…

Subjects/Keywords: extent of reduction; water gas shift; lanthana; UV-visible spectroscopy; Chemical Engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Brown, J. C. (2012). UV Visible Spectra Analysis of High Temperature Water Gas Shift Catalysts Made from Iron, Lanthanum, Copper, and Chromium Oxides. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4221&context=etd

Chicago Manual of Style (16^th Edition):

Brown, Jared C. “UV Visible Spectra Analysis of High Temperature Water Gas Shift Catalysts Made from Iron, Lanthanum, Copper, and Chromium Oxides.” 2012. Masters Thesis, Brigham Young University. Accessed November 15, 2019. https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4221&context=etd.

MLA Handbook (7^th Edition):

Brown, Jared C. “UV Visible Spectra Analysis of High Temperature Water Gas Shift Catalysts Made from Iron, Lanthanum, Copper, and Chromium Oxides.” 2012. Web. 15 Nov 2019.

Vancouver:

Brown JC. UV Visible Spectra Analysis of High Temperature Water Gas Shift Catalysts Made from Iron, Lanthanum, Copper, and Chromium Oxides. [Internet] [Masters thesis]. Brigham Young University; 2012. [cited 2019 Nov 15]. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4221&context=etd.

Council of Science Editors:

Brown JC. UV Visible Spectra Analysis of High Temperature Water Gas Shift Catalysts Made from Iron, Lanthanum, Copper, and Chromium Oxides. [Masters Thesis]. Brigham Young University; 2012. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4221&context=etd

University of Southern California

26. Abdollahi, Mitra. An integrated 'one-box' process for hydrogen production.

Degree: PhD, Chemical Engineering, 2011, University of Southern California

URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/471342/rec/768

► Hydrogen is widely considered as a fuel for the future to address the energy crisis and the environmental concerns. In this study, process intensification in… (more)

▼ Hydrogen is widely considered as a fuel for the future to address the energy crisis and the environmental concerns. In this study, process intensification in hydrogen production from natural gas, coal- and biomass-derived syngas is investigated both experimentally and theoretically. A novel reactor/separator system, termed the “one-box” process is being employed. The heart of this system is a membrane reactor (MR) that combines the water-gas shift (WGS) reaction with hydrogen separation into a single unit, thus eliminating the need for the commonly utilized two separate WGS reactors and a distinct purification unit.; Impurity-resistant carbon molecular sieve (CMS) membranes and sour-gas shift catalysts are utilized in order to treat the gas streams with simulated coal/biomass-derived syngas compositions. Both have shown high tolerance for H2S and NH3, which are the main impurities in the syngas (in fact, the sour-gas shift catalysts require sulfur to be present in order to remain active). This adds another benefit to the system by eliminating the need for gas clean-up upstream of the WGS reactor, which saves energy, and significantly simplifies the process design. The CMS membrane stability is further investigated in the presence of model tar and organic vapor compounds. The membranes proved to be stable at temperatures akin to the WGS environment. Permeation loss occurred at lower temperatures; however, regeneration was readily achieved by purging the membranes with inert gas at higher temperatures. This indicates that at low temperatures only surface coverage through condensation occurs, with little or no irreversible pore plugging of the membrane.; The project focus has been on experimental investigations in order to prove the feasibility of using the ‘one-box’ system for H2 production and to validate a mathematical model developed for use for scale-up investigations. Prior to their use in the MR experiments, the membranes are characterized via single and multi-component gas permeation measurements. Packed-bed experiments are also performed in order to derive the kinetic rate expressions. The effect of different experimental conditions on MR performance, in terms of CO conversion, hydrogen product recovery and purity is experimentally studied, and the results are compared with those from the mathematical model. The model is further used for process scale-up, and in order predict the MR performance under conditions akin to the industrial applications. It is shown that the MR-based systems are capable of converting more CO into H2 when compared to the more traditional packed-bed reactors, in some cases attaining almost complete CO conversions.; In addition to the CMS membrane-based MR, we have also investigated palladium (Pd) membranes with infinite selectivity towards hydrogen, combined with low-temperature shift (LTS) catalysts are used for ultra pure hydrogen production from gas streams with simulated natural gas reformate compositions, to serve as a feed for fuel cell applications. One key advantage of using the… Advisors/Committee Members: Tsotsis, Theodore T. (Committee Chair), Sahimi, Muhammad (Committee Member), Pirbazari, Massoud M. (Committee Member).

Subjects/Keywords: hydrogen production; membrane reactor; water-gas shift reaction; carbon membrane; palladium membrane

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Abdollahi, M. (2011). An integrated 'one-box' process for hydrogen production. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/471342/rec/768

Chicago Manual of Style (16^th Edition):

Abdollahi, Mitra. “An integrated 'one-box' process for hydrogen production.” 2011. Doctoral Dissertation, University of Southern California. Accessed November 15, 2019. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/471342/rec/768.

MLA Handbook (7^th Edition):

Abdollahi, Mitra. “An integrated 'one-box' process for hydrogen production.” 2011. Web. 15 Nov 2019.

Vancouver:

Abdollahi M. An integrated 'one-box' process for hydrogen production. [Internet] [Doctoral dissertation]. University of Southern California; 2011. [cited 2019 Nov 15]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/471342/rec/768.

Council of Science Editors:

Abdollahi M. An integrated 'one-box' process for hydrogen production. [Doctoral Dissertation]. University of Southern California; 2011. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/471342/rec/768

New Jersey Institute of Technology

27. Zhu, Yuan. CO2 reduction over noble metal/carbon nanotube catalyst.

Degree: PhD, Chemical, Biological and Pharmaceutical Engineering, 2017, New Jersey Institute of Technology

URL: https://digitalcommons.njit.edu/dissertations/50

► Carbon nanotube-based Pt/Pd and Ru catalysts, independently synthesized by a microwave reaction technique, show good catalytic activity for CO2 reduction in the contexts of… (more)

Subjects/Keywords: Dry reforming; Reverse water gas shift; Carbon Nanotube; Kinetics modeling; Chemical Engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhu, Y. (2017). CO2 reduction over noble metal/carbon nanotube catalyst. (Doctoral Dissertation). New Jersey Institute of Technology. Retrieved from https://digitalcommons.njit.edu/dissertations/50

Chicago Manual of Style (16^th Edition):

Zhu, Yuan. “CO2 reduction over noble metal/carbon nanotube catalyst.” 2017. Doctoral Dissertation, New Jersey Institute of Technology. Accessed November 15, 2019. https://digitalcommons.njit.edu/dissertations/50.

MLA Handbook (7^th Edition):

Zhu, Yuan. “CO2 reduction over noble metal/carbon nanotube catalyst.” 2017. Web. 15 Nov 2019.

Vancouver:

Zhu Y. CO2 reduction over noble metal/carbon nanotube catalyst. [Internet] [Doctoral dissertation]. New Jersey Institute of Technology; 2017. [cited 2019 Nov 15]. Available from: https://digitalcommons.njit.edu/dissertations/50.

Council of Science Editors:

Zhu Y. CO2 reduction over noble metal/carbon nanotube catalyst. [Doctoral Dissertation]. New Jersey Institute of Technology; 2017. Available from: https://digitalcommons.njit.edu/dissertations/50

University of Arizona

28. Zhang, Shuyang. Desulfurized Jet A Fuel Processing To Produce Hydrogen via Autothermal Reforming and Water-Gas Shift .

Degree: 2018, University of Arizona

URL: http://hdl.handle.net/10150/630165

► Hydrogen is an alternative fuel which is well recognized as one of the solutions to the fossil fuel depletion problem. As an energy carrier, hydrogen… (more)

▼ Hydrogen is an alternative fuel which is well recognized as one of the solutions to the fossil fuel depletion problem. As an energy carrier, hydrogen can be used to store and deliver energy or be converted into other types of energy, such as heat, electrical energy or mechanical work. Among all the applications, fuel cell is drawing increasing attention for its advantages such as higher theoretical energy conversion efficiency, no internal moving mechanical parts and environmentally friendly. Almost all the common fuel cells require hydrogen gas as the fuel source oxidized to complete the half-reaction redox cycle, which makes hydrogen gas a crucial factor for the development of fuel cell technique. However, under some certain circumstances, hydrogen supply could be extremely constrained by the harsh environment. For example, fuel cells used onboard has critical requirement on the space and extremely limited energy source, which makes carrying extra hydrogen tanks not an option in most cases. Therefore, onboard hydrogen production via catalytic autothermal reforming (ATR) and water-gas shift (WGS) is considered beneficial to vehicles using fuel cells as auxiliary power unit because it eliminates the challenges of hydrogen storage and delivery. The objective of this research is to develop a fuel processing system with reliable ATR and WGS catalysts to produce hydrogen feasibly from Jet A fuel, which is used as the primary fuel for both civilian and military transportation. Jet A fuel is expected to be converted into hydrogen gas, so that when considering onboard fuel cell applications, extra tanks of natural gas, ammonia or other hydrocarbons are not necessary. However, before the process can be examined, the sulfur component containing in the Jet A fuel must be removed because sulfur can easily poison the catalysts participating in the conversion reactions and even the catalysts in the downstream fuel cells. An effective and reliable in-house-made adsorbent was developed through simple procedures and cheap raw materials. The adsorbent has a very large surface area of over 250 m2/g with the optimal sulfur adsorption capacity of 2.95 mg-S/g-ads at the breakthrough point of 50 ppmw S in effluent fuel. A kwth-class fuel processing testing system was designed and fabricated afterwards in the lab to examine the system performance through experiments. The ATR of n-dodecane, working as the surrogate of Jet A fuel, was firstly studied with the initial simplified system under different operating conditions for better understanding each of the reactions. The compositions of system effluents in dry gas basis were detected by an on-site GC instrument and the gas temperature at distinct locations were monitored by a bunch of thermocouples connecting to a data acquisition (DAQ) system purchased from National Instruments company. Three indices, hydrogen yield, fuel conversion and energy efficiency were calculated based on the experimental results to evaluate the system performance. In addition, a novel in-house-made honeycomb-type… Advisors/Committee Members: Li, Peiwen (advisor), Chan, Cho Lik (committeemember), Zohar, Yitshak (committeemember), Farrell, James (committeemember).

Subjects/Keywords: autothermal reforming; fuel processing; heat exchanger; hydrogen production; self-sustainability; water-gas shift

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, S. (2018). Desulfurized Jet A Fuel Processing To Produce Hydrogen via Autothermal Reforming and Water-Gas Shift . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/630165

Chicago Manual of Style (16^th Edition):

Zhang, Shuyang. “Desulfurized Jet A Fuel Processing To Produce Hydrogen via Autothermal Reforming and Water-Gas Shift .” 2018. Doctoral Dissertation, University of Arizona. Accessed November 15, 2019. http://hdl.handle.net/10150/630165.

MLA Handbook (7^th Edition):

Zhang, Shuyang. “Desulfurized Jet A Fuel Processing To Produce Hydrogen via Autothermal Reforming and Water-Gas Shift .” 2018. Web. 15 Nov 2019.

Vancouver:

Zhang S. Desulfurized Jet A Fuel Processing To Produce Hydrogen via Autothermal Reforming and Water-Gas Shift . [Internet] [Doctoral dissertation]. University of Arizona; 2018. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/10150/630165.

Council of Science Editors:

Zhang S. Desulfurized Jet A Fuel Processing To Produce Hydrogen via Autothermal Reforming and Water-Gas Shift . [Doctoral Dissertation]. University of Arizona; 2018. Available from: http://hdl.handle.net/10150/630165

University of Cincinnati

29. Arvanitis, Antonios. High Temperature High Pressure Water Gas Shift Reaction in Zeolite Membrane Reactors.

Degree: PhD, Engineering and Applied Science: Chemical Engineering, 2019, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563872266361549

► The water gas shift (WGS) reaction of syngas (mainly containing CO, CO2, and H2) and subsequent H2/CO2 separation are key operations for H2 production from… (more)

▼ The water gas shift (WGS) reaction of syngas (mainly containing CO, CO2, and H2) and subsequent H2/CO2 separation are key operations for H2 production from fossil fuels, agricultural and forestry biomass, and municipal wastes with pre-combustion CO2 capture in thermal electric power production by the emerging integrated gasification-combined cycle (IGCC) power plants. Hydrogen permselective membrane reactors (MR) are capable of achieving near complete CO conversion (?CO) with simultaneous H2/CO2 separation that can substantially simplify and intensify the process to lower the overall operation cost. However, up to date, there is a lack of WGS MRs, which are practically viable either due to membrane instability in the WGS reaction of real syngas or insufficient ?CO and H2 recovery (RH2). This dissertation reports the development and scale up of thermally and chemically stable tubular zeolite membranes for future industrial high temperature and high pressure WGS MR to achieve nearly complete ?CO when nearly total RH2 is achieved in the permeate stream.An effective in-situ crystallization method has been established for synthesizing MFI-type zeolite membranes on industrially meaningful low-cost commercial porous a-alumina tube supports. The zeolite membranes with a length of 35 cm exhibited a H2/CO2 selectivity (aH2/CO2) ranging from 10 to 45 and hydrogen permeance (Pm,H2), of 1 – 2*10-7 mol/m2·Pa·s at 500 °C. The WGS reaction in the single tube zeolite MR has been studied at high temperature (500 °C) and high pressure (20bar) using nanocrystalline Fe-based catalysts under practically meaningful space velocities and steam-to-CO ratios. The zeolite membranes with moderate aH2/CO2 and Pm,H2, exceeded the equilibrium conversion at >500 °C and achieved ?CO >99.9%. Realization of near-complete ?CO must rely on the prevention of excessive permeation of CO when the membrane has imperfect H2/CO selectivity. For the porous membranes with imperfect H2/CO permeation selectivity, such as the zeolite membranes in this research, the arrangement of catalyst loading along the membrane tube length has shown significant influences on the ?CO. For near-complete ?CO, the CO must be largely converted through the pre-membrane section so that CO partial pressure becomes sufficiently low to prevent excessive CO leak to the permeate side. A simple one-dimensional isothermal PFR model has been established for simulation of the WGS reaction in the zeolite membrane tubes with large lengths and small diameters. Both the experimental investigations and model calculations have indicated that such a distributed catalyst packing is effective for obtaining total removal of H2 and negligible escape of unreacted CO to accomplish near-complete ?CO (>99.5%). Such packing significantly improves the performance of the MR compared to the uniform packing of catalyst with the same load.Finally, because of the limited aH2/CO2, the H2 purity in the permeate stream is moderate when achieving total removal of H2 from the reaction side. A highly CO2-selective polymeric… Advisors/Committee Members: Dong, Junhang (Committee Chair).

Subjects/Keywords: Chemical Engineering; Water-Gas-Shift; Zeolites; Membrane Reactor; High Pressure; High Temperature

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Arvanitis, A. (2019). High Temperature High Pressure Water Gas Shift Reaction in Zeolite Membrane Reactors. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563872266361549

Chicago Manual of Style (16^th Edition):

Arvanitis, Antonios. “High Temperature High Pressure Water Gas Shift Reaction in Zeolite Membrane Reactors.” 2019. Doctoral Dissertation, University of Cincinnati. Accessed November 15, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563872266361549.

MLA Handbook (7^th Edition):

Arvanitis, Antonios. “High Temperature High Pressure Water Gas Shift Reaction in Zeolite Membrane Reactors.” 2019. Web. 15 Nov 2019.

Vancouver:

Arvanitis A. High Temperature High Pressure Water Gas Shift Reaction in Zeolite Membrane Reactors. [Internet] [Doctoral dissertation]. University of Cincinnati; 2019. [cited 2019 Nov 15]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563872266361549.

Council of Science Editors:

Arvanitis A. High Temperature High Pressure Water Gas Shift Reaction in Zeolite Membrane Reactors. [Doctoral Dissertation]. University of Cincinnati; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563872266361549

University of California – Riverside

30. Thanmongkhon, Yoothana. The Production of High Levels of Renewable Natural Gas from Biomass Using Steam Hydrogasification.

Degree: Chemical and Environmental Engineering, 2014, University of California – Riverside

URL: http://www.escholarship.org/uc/item/6qh949sb

► Renewable Natural Gas (RNG) has been identified as an important alternative fuel that can help to achieve a number of national goals related to the… (more)

Subjects/Keywords: Chemical engineering; Biomass and Biosolids; Methane and Hydrogen; Process Demonstration Unit; Renewable Natural Gas; Steam Hydrogasification; Water Gas Shift

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Thanmongkhon, Y. (2014). The Production of High Levels of Renewable Natural Gas from Biomass Using Steam Hydrogasification. (Thesis). University of California – Riverside. Retrieved from http://www.escholarship.org/uc/item/6qh949sb

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Thanmongkhon, Yoothana. “The Production of High Levels of Renewable Natural Gas from Biomass Using Steam Hydrogasification.” 2014. Thesis, University of California – Riverside. Accessed November 15, 2019. http://www.escholarship.org/uc/item/6qh949sb.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Thanmongkhon, Yoothana. “The Production of High Levels of Renewable Natural Gas from Biomass Using Steam Hydrogasification.” 2014. Web. 15 Nov 2019.

Vancouver:

Thanmongkhon Y. The Production of High Levels of Renewable Natural Gas from Biomass Using Steam Hydrogasification. [Internet] [Thesis]. University of California – Riverside; 2014. [cited 2019 Nov 15]. Available from: http://www.escholarship.org/uc/item/6qh949sb.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Thanmongkhon Y. The Production of High Levels of Renewable Natural Gas from Biomass Using Steam Hydrogasification. [Thesis]. University of California – Riverside; 2014. Available from: http://www.escholarship.org/uc/item/6qh949sb

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations