subject:(Dehydrogenation)

Nelson Mandela Metropolitan University

1. Mpuhlu, Batsho. Vapour phase dehydrogenation of cyclohexane on microstructured reactors.

Degree: Faculty of Science, 2012, Nelson Mandela Metropolitan University

► The work that is described in this thesis forms part of the research and development projects at InnoVenton: NMMU Institute of Chemical Technology in collaboration… (more)

▼ The work that is described in this thesis forms part of the research and development projects at InnoVenton: NMMU Institute of Chemical Technology in collaboration with Sasol Technologies. The broader view of the project was testing on the so-called “Small Production Platforms” (SPP’s). In particular the main aim of this study was to investigate the effect of micro-structuring on the heterogeneous catalysed, vapour-phase oxidative dehydrogenation of cyclohexane in the presence of air. Ground work studies were done to provide a proper comparison of the micro-structured reactor with a traditional fixed-bed reactor. These included evaluation of a proper vanadium pyrophosphate catalyst for the reaction, testing of reaction parameters for the oxidative dehydrogenation reaction on a fixed-bed reactor and lastly comparing the performance of the micro-structured reactor to that of the fixed-bed reactor Various vanadium pyrophosphate catalysts that were tested for activity included: bulk (VO)2P2O7, bulk (VO)2P2O7 promoted with Fe, (VO)2P2O7 supported on -Al2O3 and Fe promoted (VO)2P2O7 supported on -Al2O3. These catalysts showed significant differences in TOF, however it was not conclusive from the results whether these differences may be traced to increased activity for dehydrogenation for different catalysts since all reactions were run under conditions of oxygen deficiency. It is, however, clear that Fe promotion significantly increase activity, irrespective of the relative degrees of oxidative dehydrogenation and normal dehydrogenation. The Fe promoted catalyst was further tested for long term stability in-view of using it as the catalyst in the micro-structured reactor. These studies showed the catalyst to have a high degree of stability with minimal structural changes under the reaction conditions used. Various response surface models describing the variation in each of the cyclohexane conversion, cyclohexene selectivity, and benzene selectivity, respectively when changing reaction condition, were derived by means of multiple regression. To obtain some idea of the degree and nature of the normal dehydrogenation reaction, the amount of deficit oxygen was estimated from the measured results for cyclohexane conversion and cyclohexene and benzene selectivities. These estimated values were also modelled as described above. The regression models were used to interpret specific trends in the responses for the oxidative dehydrogenation of cyclohexane and account for the oxygen deficit in the system. The performance of a fixed bed tubular reactor (FBR) and micro-structured sandwich reactor (MSSR) were compared over an Fe promoted vanadium pyrophosphate. Reactor performance was evaluated by varying specific reaction conditions (temperature and space velocity). Subsequently the turn-over frequencies, conversion and selectivities from the two reactors were compared. The conversion achieved in the micro-structured reactor was observed to be significantly higher than that achieved in the fixed-bed reactor at all reaction…

Subjects/Keywords: Dehydrogenation; Cyclohexane

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APA (6^th Edition):

Mpuhlu, B. (2012). Vapour phase dehydrogenation of cyclohexane on microstructured reactors. (Thesis). Nelson Mandela Metropolitan University. Retrieved from http://hdl.handle.net/10948/8661

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):

Mpuhlu, Batsho. “Vapour phase dehydrogenation of cyclohexane on microstructured reactors.” 2012. Thesis, Nelson Mandela Metropolitan University. Accessed March 06, 2021. http://hdl.handle.net/10948/8661.

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

MLA Handbook (7^th Edition):

Mpuhlu, Batsho. “Vapour phase dehydrogenation of cyclohexane on microstructured reactors.” 2012. Web. 06 Mar 2021.

Vancouver:

Mpuhlu B. Vapour phase dehydrogenation of cyclohexane on microstructured reactors. [Internet] [Thesis]. Nelson Mandela Metropolitan University; 2012. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10948/8661.

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

Council of Science Editors:

Mpuhlu B. Vapour phase dehydrogenation of cyclohexane on microstructured reactors. [Thesis]. Nelson Mandela Metropolitan University; 2012. Available from: http://hdl.handle.net/10948/8661

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

University of Utah

2. Sun, Hao. Dehyrdogenation of indole and indoline compounds by cytochrome P450 enzymes.

Degree: PhD, Pharmacology & Toxicology;, 2007, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/678/rec/289

► 3-Substituted indoles like 3-methylindole, zafirlukast and MK-0524 are dehydrogenated by cytochrome P450s to form reactive 3-methyleneindolenine electrophiles, which covalently conjugate with protein and/or DNA nucleophilic… (more)

▼ 3-Substituted indoles like 3-methylindole, zafirlukast and MK-0524 are dehydrogenated by cytochrome P450s to form reactive 3-methyleneindolenine electrophiles, which covalently conjugate with protein and/or DNA nucleophilic residues to cause toxicities. Likewise, the dehydrogenation of indolines to form indoles is a potentially important transformation. However, the mechanisms that govern the dehydrogenation reaction by selected P450s have not been fully established. The goal of this dissertation was to evaluate the ability of P450s to catalyze the dehydrogenation of indole and indoline compounds. In the present study, the in vitro metabolism of another 3-substituted indole, SPD-304, a newly discovered small-molecule TNF antagonist, together with indoline and indoline-containing drugs including indapamide, DW2282 (anti-cancer), SB-206553 (5-HT 2C/2B antagonist), SB-224289 (5-HT 1B inverse agonist) and pyroquilon, and several synthetic indoline derivatives, were investigated. We found SPD-304 was bioactivated through a dehydrogenation mechanism identical to 3-methylindole, to produce an electrophilic 3-methyleneindolenine, which was trapped by the nucleophile glutathione. This potentially important new drug caused the selective mechanism-based inactivation of CYP3A4. In addition, we also found that all the indolines were aromatized to indoles through a novel dehydrogenation pathway, which appeared to be initiated by C-H bond breakage instead of nitrogen oxidation. The metabolic profiles of the substrates were also assessed by in silico molecular docking. Dehydrogenation of SPD-304 appeared to be a major metabolic pathway, and the arginine 212 residue in the active site of CYP3A4 played an important role in hydrogen bonding with all indoline nitrogens by positioning the C-2 and C-3 carbons of indolines close to the heme iron for dehydrogenation. Using this in silico docking strategy, in combination with site-directed mutagenesis and homology modeling techniques, pulmonary cytochrome P450 2F3 and mutants were constructed and docked with substrate 3-methylindole. Substrate orientation favoring dehydrogenation was identified and verified by enzyme kinetic studies, with additional critical residues in the active site of CYP2F3 identified that could direct the selective dehydrogenation reaction. This research has significantly broadened our current understanding about the mechanisms of cytochrome P450-mediated dehydrogenation of xenobiotic indole and indoline compounds.

Subjects/Keywords: Dehydrogenation; Indoline

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APA (6^th Edition):

Sun, H. (2007). Dehyrdogenation of indole and indoline compounds by cytochrome P450 enzymes. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/678/rec/289

Chicago Manual of Style (16^th Edition):

Sun, Hao. “Dehyrdogenation of indole and indoline compounds by cytochrome P450 enzymes.” 2007. Doctoral Dissertation, University of Utah. Accessed March 06, 2021. http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/678/rec/289.

MLA Handbook (7^th Edition):

Sun, Hao. “Dehyrdogenation of indole and indoline compounds by cytochrome P450 enzymes.” 2007. Web. 06 Mar 2021.

Vancouver:

Sun H. Dehyrdogenation of indole and indoline compounds by cytochrome P450 enzymes. [Internet] [Doctoral dissertation]. University of Utah; 2007. [cited 2021 Mar 06]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/678/rec/289.

Council of Science Editors:

Sun H. Dehyrdogenation of indole and indoline compounds by cytochrome P450 enzymes. [Doctoral Dissertation]. University of Utah; 2007. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/678/rec/289

University of Adelaide

3. Joshua, Chittoor Philip. Photochemical cyclodehydrogenation reactions / by C.P. Joshua.

Degree: 1967, University of Adelaide

URL: http://hdl.handle.net/2440/20907

► The photochemical reactions of benzalaniline and other substituted Schiff bases in 98% sulphuric acid were examined. Benzalaniline was found to undergo photochemical cyclohydrogenation to phenanthridine… (more)

Subjects/Keywords: Dehydrogenation.

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APA (6^th Edition):

Joshua, C. P. (1967). Photochemical cyclodehydrogenation reactions / by C.P. Joshua. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/20907

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):

Joshua, Chittoor Philip. “Photochemical cyclodehydrogenation reactions / by C.P. Joshua.” 1967. Thesis, University of Adelaide. Accessed March 06, 2021. http://hdl.handle.net/2440/20907.

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

MLA Handbook (7^th Edition):

Joshua, Chittoor Philip. “Photochemical cyclodehydrogenation reactions / by C.P. Joshua.” 1967. Web. 06 Mar 2021.

Vancouver:

Joshua CP. Photochemical cyclodehydrogenation reactions / by C.P. Joshua. [Internet] [Thesis]. University of Adelaide; 1967. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/2440/20907.

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

Council of Science Editors:

Joshua CP. Photochemical cyclodehydrogenation reactions / by C.P. Joshua. [Thesis]. University of Adelaide; 1967. Available from: http://hdl.handle.net/2440/20907

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

Texas Tech University

4. Bresler, Douglas George. Performance of a York-Scheibel column on an acetonitrile-potassium carbonate-water system.

Degree: Chemical Engineering, 1969, Texas Tech University

URL: http://hdl.handle.net/2346/18285

Subjects/Keywords: Dehydrogenation

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APA (6^th Edition):

Bresler, D. G. (1969). Performance of a York-Scheibel column on an acetonitrile-potassium carbonate-water system. (Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/18285

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):

Bresler, Douglas George. “Performance of a York-Scheibel column on an acetonitrile-potassium carbonate-water system.” 1969. Thesis, Texas Tech University. Accessed March 06, 2021. http://hdl.handle.net/2346/18285.

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

MLA Handbook (7^th Edition):

Bresler, Douglas George. “Performance of a York-Scheibel column on an acetonitrile-potassium carbonate-water system.” 1969. Web. 06 Mar 2021.

Vancouver:

Bresler DG. Performance of a York-Scheibel column on an acetonitrile-potassium carbonate-water system. [Internet] [Thesis]. Texas Tech University; 1969. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/2346/18285.

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

Council of Science Editors:

Bresler DG. Performance of a York-Scheibel column on an acetonitrile-potassium carbonate-water system. [Thesis]. Texas Tech University; 1969. Available from: http://hdl.handle.net/2346/18285

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

Rutgers University

5. Blessent, Michael John, 1985-. Development of pincer iridium catalysts for alkane dehydrogenation.

Degree: PhD, Chemistry and Chemical Biology, 2016, Rutgers University

URL: https://rucore.libraries.rutgers.edu/rutgers-lib/49155/

►

Catalysis is a technology of vital importance, enabling the production of many goods which are essential to the modern lifestyle. As such, the continued development… (more)

▼

Catalysis is a technology of vital importance, enabling the production of many goods which are essential to the modern lifestyle. As such, the continued development of catalysis is of great importance, helping to reduce the costs and environment harm associated with the modern economy. This thesis describes the study and design of pincer iridium complexes, a type of organometallic complex which can catalyze multiple reactions, including alkane dehydrogenation. If these catalysts are developed sufficiently, in the future they may have commercial applications for the production of fuels and commodity chemicals. The research described in this thesis focused upon catalytic activity and selectivity, two aspects of a catalytic performance, for study and improvement. Understanding the steric and electronic properties which determine activity and selectivity, from a mechanistic viewpoint, should allowed for the rational and effective design of new, higher-performing catalysts. First, the regioselectivity of dehydrogenation was examined through a combination of experimental and computational methods. The influence of each steric and electronic factor was both identified and quantified. Next, catalytic activity was investigated using a similar approach, showing that massive changes in activity (orders of magnitude) could be attributed to a single electronic factor. With these mechanistic insights in hand, the rational design of new catalysts was begun. Computational studies suggested that cationic catalysts would be several hundred fold more active than their neutral counterparts, and synthetic progress was made in that direction. Carefully considering the mechanism of dehydrogenation also allowed for process chemistry improvements which increased activity significantly. Lastly, the role of additives to dehydrogenation was also investigated, showing that certain Brønsted bases improved catalytic activity significantly.

Advisors/Committee Members: Goldman, Alan (chair), Roth, Heinz (internal member), Warmuth, Ralf (internal member), Celik, Fuat (outside member).

Subjects/Keywords: Dehydrogenation; Alkanes; Catalysts

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APA (6^th Edition):

Blessent, Michael John, 1. (2016). Development of pincer iridium catalysts for alkane dehydrogenation. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/49155/

Chicago Manual of Style (16^th Edition):

Blessent, Michael John, 1985-. “Development of pincer iridium catalysts for alkane dehydrogenation.” 2016. Doctoral Dissertation, Rutgers University. Accessed March 06, 2021. https://rucore.libraries.rutgers.edu/rutgers-lib/49155/.

MLA Handbook (7^th Edition):

Blessent, Michael John, 1985-. “Development of pincer iridium catalysts for alkane dehydrogenation.” 2016. Web. 06 Mar 2021.

Vancouver:

Blessent, Michael John 1. Development of pincer iridium catalysts for alkane dehydrogenation. [Internet] [Doctoral dissertation]. Rutgers University; 2016. [cited 2021 Mar 06]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/49155/.

Council of Science Editors:

Blessent, Michael John 1. Development of pincer iridium catalysts for alkane dehydrogenation. [Doctoral Dissertation]. Rutgers University; 2016. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/49155/

University of Utah

6. Moore, Chad Douglas. Dehydrogenation of Raloxifene by Cytochrome P450 3A4.

Degree: PhD, Pharmacology & Toxicology;, 2010, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1401/rec/288

► Raloxifene was approved in 2007 by the FDA for the chemoprevention of breast cancer in postmenopausal women with osteoporosis and in postmenopausal women at high… (more)

▼ Raloxifene was approved in 2007 by the FDA for the chemoprevention of breast cancer in postmenopausal women with osteoporosis and in postmenopausal women at high risk for invasive breast cancer. The FDA's decision was based, in part, on a more favorable safety profile for raloxifene, as compared to the standard treatment of tamoxifen. However, recent studies have demonstrated the ability of raloxifene to form reactive intermediates and to act as a mechanism-based inactivator of cytochrome P450 3A4 (CYP3A4). The reactive raloxifene intermediate was theorized to be produced either through CYP3A4-mediated dehydrogenation to a di-quinone methide or through the more common oxygenation route to an arene oxide. However, the operative mechanism was never identified. The goal of this dissertation was to characterize the reactive intermediate formation from raloxifene, specifically the ability of CYP3A4 to catalyze the dehydrogenation of raloxifene to a di-quinone methide, using a combination of convent•i onal b•i oc«h emi•c ali and-i computati• onal techn•i ques. In the current woir k,1 8O incorporation studies were utilized to differentiate CYP3A4-mediated oxygenation versus dehydrogenation of raloxifene. These studies established that 3'-hydroxyraloxifene is produced exclusively via CYP3A4-mediated oxygenation with molecular O2. These studies also provided convincing evidence for the mechanism of CYP3A4-mediated dehydrogenation of raloxifene to a reactive di-quinone methide, and excluded the alternative arene oxide pathway. Furthermore, it was demonstrated that 7-hydroxyraloxifene, which was previously believed to be a typical 02-derived metabolite of CYP3A4, is in fact produced by a highly unusual hydrolysis pathway from a putative ester, formed by conjugation of a carboxylic acid moiety of CYP3A4 or another protein, with the di-quinone methide of raloxifene. The use of molecular modeling in conjunction with site-directed mutagenesis has extensively been used to study substrate orientation within the P450 active sites, and to identify potential residues involved in positioning and/or catalysis of these substrates. However, the effectiveness of these studies is highly dependent on the selection of the most accurate enzyme crystal structure. In the current work, we compared the ability of two commonly used CYP3A4 crystal structures, 1TQN and 1 WOE, to predict the sites of metabolism of two known CYP3A4 substrates, indapamide and raloxifene. Indapamide was used to evaluate the accuracy of the molecular model, while raloxifene was used to investigate the effects of adding partial charges to the P450 heme moiety to improve predictions of metabolic pathways by computation methods. The results demonstrated that while docking studies with both 1TQN and 1 WOE crystal structures could accurately predict the sites of indapamide metabolism, the interactions between the substrate and active site residues were different for each crystal structure. The addition of partial charges to the heme moiety of 1 WOE dramatically increased the…

Subjects/Keywords: Raloxifene; Dehydrogenation; Cytochrome P450 3A4

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APA (6^th Edition):

Moore, C. D. (2010). Dehydrogenation of Raloxifene by Cytochrome P450 3A4. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1401/rec/288

Chicago Manual of Style (16^th Edition):

Moore, Chad Douglas. “Dehydrogenation of Raloxifene by Cytochrome P450 3A4.” 2010. Doctoral Dissertation, University of Utah. Accessed March 06, 2021. http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1401/rec/288.

MLA Handbook (7^th Edition):

Moore, Chad Douglas. “Dehydrogenation of Raloxifene by Cytochrome P450 3A4.” 2010. Web. 06 Mar 2021.

Vancouver:

Moore CD. Dehydrogenation of Raloxifene by Cytochrome P450 3A4. [Internet] [Doctoral dissertation]. University of Utah; 2010. [cited 2021 Mar 06]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1401/rec/288.

Council of Science Editors:

Moore CD. Dehydrogenation of Raloxifene by Cytochrome P450 3A4. [Doctoral Dissertation]. University of Utah; 2010. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1401/rec/288

7. Airaksinen, Sanna. Chromium Oxide Catalysts in the Dehydrogenation of Alkanes.

Degree: 2005, Helsinki University of Technology

URL: http://lib.tkk.fi/Diss/2005/isbn9512277964/

► Light alkenes, such as propene and butenes, are important intermediates in the manufacture of fuel components and chemicals. The direct catalytic dehydrogenation of the corresponding… (more)

▼ Light alkenes, such as propene and butenes, are important intermediates in the manufacture of fuel components and chemicals. The direct catalytic dehydrogenation of the corresponding alkanes is a selective way to produce these alkenes and is frequently carried out using chromia/alumina catalysts. The aim of this work was to obtain structure–activity information, which could be utilised in the optimisation of this catalytic system. The properties of chromia/alumina catalysts were investigated by advanced in situ and ex situ spectroscopic methods, and the activities were measured in the dehydrogenation of isobutane. The dehydrogenation activity of chromia/alumina was attributed to coordinatively unsaturated redox and non-redox Cr3+ ions at all chromium loadings. In addition, the oxygen ions in the catalyst appeared to participate in the reaction. The reduction of chromia/alumina resulted in formation of adsorbed surface species: hydroxyl groups bonded to chromia and alumina were formed in reduction by hydrogen and alkanes, and carbon-containing species in reduction by carbon monoxide and alkanes. Prereduction with hydrogen or carbon monoxide decreased the dehydrogenation activity. The effect by hydrogen was suggested to be related to the amount of OH/H species on the reduced surface affecting the number of coordinatively unsaturated chromium sites, and the effect by carbon monoxide to the formation of unselective chromium sites and carbon-containing species. The chromia/alumina catalysts were deactivated with time on stream and in cycles of (pre)reduction–dehydrogenation–regeneration. The deactivation with time on stream was caused mainly by coke formation. The nature of the coke species changed during dehydrogenation. Carboxylates and aliphatic hydrocarbon species formed at the beginning of the reaction and unsaturated/aromatic hydrocarbons and graphite-like species with increasing time on stream. The deactivation in several dehydrogenation–regeneration cycles was attributed to a decrease in the number of actives sites, which was possibly caused by clustering of the active phase into more three-dimensional structures. Acidic hydroxyl species of exposed alumina support may have contributed to the side reactions observed during dehydrogenation. Chromium catalysts prepared on unmodified alumina and on alumina modified with basic aluminium nitride-type species were compared in an attempt to increase the activity and selectivity in dehydrogenation. However, the presence of nitrogen in the catalyst was not beneficial for the dehydrogenation activity. A kinetic model was derived for the rate of dehydrogenation of isobutane on chromia/alumina. The dehydrogenation results were best described by a model with isobutane adsorption, possibly on a pair of chromium and oxygen ions, as the rate-determining step. Satisfactory description of the reaction rate depended upon inclusion of the isobutene and hydrogen adsorption parameters in the mathematical model. The activation energy of the rate-determining step was estimated to be… Advisors/Committee Members: Helsinki University of Technology, Department of Chemical Technology, Laboratory of Industrial Chemistry.

Subjects/Keywords: alkane dehydrogenation; chromia/alumina catalyst

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APA (6^th Edition):

Airaksinen, S. (2005). Chromium Oxide Catalysts in the Dehydrogenation of Alkanes. (Thesis). Helsinki University of Technology. Retrieved from http://lib.tkk.fi/Diss/2005/isbn9512277964/

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):

Airaksinen, Sanna. “Chromium Oxide Catalysts in the Dehydrogenation of Alkanes.” 2005. Thesis, Helsinki University of Technology. Accessed March 06, 2021. http://lib.tkk.fi/Diss/2005/isbn9512277964/.

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

MLA Handbook (7^th Edition):

Airaksinen, Sanna. “Chromium Oxide Catalysts in the Dehydrogenation of Alkanes.” 2005. Web. 06 Mar 2021.

Vancouver:

Airaksinen S. Chromium Oxide Catalysts in the Dehydrogenation of Alkanes. [Internet] [Thesis]. Helsinki University of Technology; 2005. [cited 2021 Mar 06]. Available from: http://lib.tkk.fi/Diss/2005/isbn9512277964/.

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

Council of Science Editors:

Airaksinen S. Chromium Oxide Catalysts in the Dehydrogenation of Alkanes. [Thesis]. Helsinki University of Technology; 2005. Available from: http://lib.tkk.fi/Diss/2005/isbn9512277964/

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

Columbia University

8. Neary, Michelle Catherine. Molybdenum, Tungsten and Nickel Compounds as Catalysts for the Dehydrogenation of Formic Acid.

Degree: 2016, Columbia University

URL: https://doi.org/10.7916/D8RJ4JPG

► Though petroleum fuels are currently a crucial part of our daily life, there is interest in developing energy sources that are more sustainable and better… (more)

▼ Though petroleum fuels are currently a crucial part of our daily life, there is interest in developing energy sources that are more sustainable and better for the environment. One possible energy source is hydrogen, which burns cleanly to produce only water as a byproduct. However, hydrogen itself cannot be easily transported and, therefore, other storage mediums are necessary. One such storage medium that has been investigated in recent years is formic acid, which is a liquid at room temperature and easier to handle. A crucial aspect of using formic acid is the ability to release hydrogen on demand. Testing possible catalysts for this transformation has driven my research over the last five years. Chapter 1 investigates the ability of a series of cyclopentadienyl molybdenum hydrides, Cp^RMo(PMe₃)_3-x(CO)_xH (Cp^R = C₅H₅, C₅Me₅; x = 0, 1, 2, 3), to catalyze formic acid dehydrogenation. Though several compounds in the series CpRMo(PMe₃)_3-x(CO)_xH have been structurally characterized before, we were able to characterize several more by X-ray diffraction. Since the compounds are structurally similar, differences in catalytic activity are governed by the electronics, which are determined primarily by the number of PMe₃ ligands relative to CO. The best catalysts are the hybrid compounds, Cp^RMo(PMe₃)₂(CO)H, due to the fact that they can be easily protonated by formic acid and readily release hydrogen to continue the catalytic cycle. Additionally, I observed that methanol and methyl formate were being produced as side products. Since methanol is also a potential hydrogen storage medium, its production is of interest. In this case, the tricarbonyl compounds, Cp^RMo(CO)₃H, were most selective for formic acid disproportionation relative to dehydrogenation. This is likely due to their relative propensity to transfer a hydride ligand to formic acid rather than to become protonated by it. We also investigated the ability of formic acid to reduce ketones and aldehydes via transfer hydrogenation. Because the phosphine-rich compounds were such effective catalysts, we sought to investigate the reactivity of other compounds with phosphine ligands towards formic acid. To this end, Chapter 2 focuses on studies involving Ni(PMe₃)₄, and Chapter 3 looks at Mo(PMe₃)₆ and W(PMe₃)₄(η²-CH₂PMe₂)H. Ni(PMe₃)₄ is indeed able to catalyze formic acid dehydrogenation. Density Functional Theory studies suggest that the mechanism involves formation of a formate-hydride followed by decarboxylation to produce a dihydride species. The ability of the PMe₃ ligand to induce decarboxylation also provides a route to synthesize Ni(PMe₃)₄ from Ni(O₂CH)₂•2H₂O and Ni(py)₄(O₂CH)₂•2py, which has been structurally characterized. To expand on the nickel phosphine reactivity, a heteroleptic nickel phosphine complex employing the bisphosphine ligand 1,2-bis(diphenylphosphino)benzene (bppb), namely (bppb)Ni(PMe₃)₂, was synthesized, characterized and tested with formic acid. It also catalyzes dehydrogenation, but rearranges…

Subjects/Keywords: Catalysts; Dehydrogenation; Chemistry; Formic acid

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APA (6^th Edition):

Neary, M. C. (2016). Molybdenum, Tungsten and Nickel Compounds as Catalysts for the Dehydrogenation of Formic Acid. (Doctoral Dissertation). Columbia University. Retrieved from https://doi.org/10.7916/D8RJ4JPG

Chicago Manual of Style (16^th Edition):

Neary, Michelle Catherine. “Molybdenum, Tungsten and Nickel Compounds as Catalysts for the Dehydrogenation of Formic Acid.” 2016. Doctoral Dissertation, Columbia University. Accessed March 06, 2021. https://doi.org/10.7916/D8RJ4JPG.

MLA Handbook (7^th Edition):

Neary, Michelle Catherine. “Molybdenum, Tungsten and Nickel Compounds as Catalysts for the Dehydrogenation of Formic Acid.” 2016. Web. 06 Mar 2021.

Vancouver:

Neary MC. Molybdenum, Tungsten and Nickel Compounds as Catalysts for the Dehydrogenation of Formic Acid. [Internet] [Doctoral dissertation]. Columbia University; 2016. [cited 2021 Mar 06]. Available from: https://doi.org/10.7916/D8RJ4JPG.

Council of Science Editors:

Neary MC. Molybdenum, Tungsten and Nickel Compounds as Catalysts for the Dehydrogenation of Formic Acid. [Doctoral Dissertation]. Columbia University; 2016. Available from: https://doi.org/10.7916/D8RJ4JPG

Georgia Tech

9. Bracale, Sergio. The catalytic dehydrogenation of butane in fluidized beds.

Degree: MS, Chemical Engineering, 1958, Georgia Tech

URL: http://hdl.handle.net/1853/11783

Subjects/Keywords: Butane; Dehydrogenation

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APA (6^th Edition):

Bracale, S. (1958). The catalytic dehydrogenation of butane in fluidized beds. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/11783

Chicago Manual of Style (16^th Edition):

Bracale, Sergio. “The catalytic dehydrogenation of butane in fluidized beds.” 1958. Masters Thesis, Georgia Tech. Accessed March 06, 2021. http://hdl.handle.net/1853/11783.

MLA Handbook (7^th Edition):

Bracale, Sergio. “The catalytic dehydrogenation of butane in fluidized beds.” 1958. Web. 06 Mar 2021.

Vancouver:

Bracale S. The catalytic dehydrogenation of butane in fluidized beds. [Internet] [Masters thesis]. Georgia Tech; 1958. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/1853/11783.

Council of Science Editors:

Bracale S. The catalytic dehydrogenation of butane in fluidized beds. [Masters Thesis]. Georgia Tech; 1958. Available from: http://hdl.handle.net/1853/11783

Louisiana State University

10. O'Brien, Edward. The stereospecific hydrogenation and dehydrogenation of rosin and fatty acids.

Degree: MSChE, Chemical Engineering, 2011, Louisiana State University

URL: etd-11112011-103225 ; https://digitalcommons.lsu.edu/gradschool_theses/2081

► Tall oil is a byproduct of the standard wood pulping process in the paper industry. It is primarily made up of C:18 fatty acids, rosin… (more)

▼ Tall oil is a byproduct of the standard wood pulping process in the paper industry. It is primarily made up of C:18 fatty acids, rosin acids and a minor fraction of neutrals. Normally, tall oil is further distilled into fractions and then hydrogenated or dehydrogenated into different products. In this project, three heterogeneous catalytic methods of producing byproducts of various distilled tall oil fractions were examined at lower temperatures and pressures than the industry norm in an attempt to develop cheaper production processes. Reactions were conducted in stirred batch reactors of different sizes and product compositions were analyzed primarily by GC/MS and GC. The selective hydrogenation of abietic acid, a common rosin acid, to abietyl alcohol in the presence of fatty acids was examined first. For the conditions and catalysts used, the yield to abietyl alcohol was small and the reaction was not selective, giving both ring hydrogenation and dehydrogenation. Second, the dehydrogenation of abietic acid to dehydroabietic acid in a primarily rosin feed was studied. The Pd/C class of catalysts had the greatest activity. There was a maximum yield of 58% associated with equilibrium, and the reaction took place predominantly as a disproportionation. The reaction was very slow at temperatures less than 230 °C, and decarboxylation occurred in greater abundance as time or temperature of the reaction was increased. In the mainly rosin feed (HYR), some polymerization occurred; however, the amount of polymer was relatively small, the polymer was thermally labile and most likely thermal in origin. Finally, the gas environment (H2, N2, air) did not have a significant effect on the reaction. The final reaction studied was the selective hydrogenation of unsaturated fatty acids to unsaturated fatty alcohols in a mainly fatty acid feed. The results showed that the hydrogenation could not occur to a significant degree at conditions less than 250 °C and 87 bar, for any of the common classes of hydrogenation catalysts.

Subjects/Keywords: hydrogenation; dehydrogenation; fatty; Rosin

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

APA (6^th Edition):

O'Brien, E. (2011). The stereospecific hydrogenation and dehydrogenation of rosin and fatty acids. (Masters Thesis). Louisiana State University. Retrieved from etd-11112011-103225 ; https://digitalcommons.lsu.edu/gradschool_theses/2081

Chicago Manual of Style (16^th Edition):

O'Brien, Edward. “The stereospecific hydrogenation and dehydrogenation of rosin and fatty acids.” 2011. Masters Thesis, Louisiana State University. Accessed March 06, 2021. etd-11112011-103225 ; https://digitalcommons.lsu.edu/gradschool_theses/2081.

MLA Handbook (7^th Edition):

O'Brien, Edward. “The stereospecific hydrogenation and dehydrogenation of rosin and fatty acids.” 2011. Web. 06 Mar 2021.

Vancouver:

O'Brien E. The stereospecific hydrogenation and dehydrogenation of rosin and fatty acids. [Internet] [Masters thesis]. Louisiana State University; 2011. [cited 2021 Mar 06]. Available from: etd-11112011-103225 ; https://digitalcommons.lsu.edu/gradschool_theses/2081.

Council of Science Editors:

O'Brien E. The stereospecific hydrogenation and dehydrogenation of rosin and fatty acids. [Masters Thesis]. Louisiana State University; 2011. Available from: etd-11112011-103225 ; https://digitalcommons.lsu.edu/gradschool_theses/2081

Rutgers University

11. Zheng, Yang. Rational design and synthesize sterically less hindered pincer-iridium catalysts for alkane dehydrogenation.

Degree: MS, Chemistry and Chemical Biology, 2015, Rutgers University

URL: https://rucore.libraries.rutgers.edu/rutgers-lib/47621/

► Dehydrogenation of alkane, which can convert alkane to alkene effectively and atom economically, is one of the most important and challenge goal in modern catalysis… (more)

▼ Dehydrogenation of alkane, which can convert alkane to alkene effectively and atom economically, is one of the most important and challenge goal in modern catalysis since the dehydrogenation product, alkenes, are ubiquitous as reagents and intermediates for a variety of useful transformation. Our group focused on the development of PCP Iridium catalysts for alkane dehydrogenation in the last decades and made lots of significant breakthroughs. One of them was that we found the steric hindrance of the PCP ligand backbone can affect the activity of the catalysts for dehydrogenation of alkane observably. The work presented in this thesis studied one new sterically less hindered pincer-ligated Iridium complex, (tBu2PCPMe2)IrH4, as the perfection of the study of the steric effect of PCP Iridium complexes for alkane dehydrogenation. (tBu2PCPMe2)IrH4 is the least steric PCP Iridium complex we have every made. It was expected to have all the advantage as another small steric complex (tBu2Me2PCP)IrH4, which had shown very high reactivity for alkane dehydrogenation but was hard to synthesis. (tBu2PCPMe2)IrH4 has the comparable satiric and electronic effects as (tBu2Me2PCP)IrH4 and is relatively easier to synthesis compared with the latter. What’s more, without the β-H in Me2- side, the stability of complex may be improved due to the less chance undergoing Cyclometalation. As such, (tBu2PCPMe2)IrH4 is a good complex to study the steric effect of PCP Iridium complexes for alkane dehydrogenation. tBu2PCPMe2-H ligand was successfully synthesized by a revised procedure. The corresponding Iridium complexes (tBu2PCPMe2)IrH4 and (tBu2PCPMe2)Ir(C2H4) were made as well. Addition of small molecules, H2, N2, CO, to (tBu2PCPMe2)IrH4 and (tBu2PCPMe2)Ir(C2H4) was then studied to investigate the properties of such complexes. The alkane transfer dehydrogenation of cyclooctane by (tBu2PCPMe2)IrH4 and (tBu2PCPMe2)Ir(C2H4) was studied to compare the activity of this new complex with our previous PCP Iridium catalysts. Finally, the effect of different acceptor and the effect of acceptor’s concentration were also studied. Advisors/Committee Members: Goldman, Alan (chair), Krogh-Jespersen, Karsten (internal member), Zhang, Xumu (internal member).

Subjects/Keywords: Iridium catalysts; Alkanes; Dehydrogenation

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APA (6^th Edition):

Zheng, Y. (2015). Rational design and synthesize sterically less hindered pincer-iridium catalysts for alkane dehydrogenation. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/47621/

Chicago Manual of Style (16^th Edition):

Zheng, Yang. “Rational design and synthesize sterically less hindered pincer-iridium catalysts for alkane dehydrogenation.” 2015. Masters Thesis, Rutgers University. Accessed March 06, 2021. https://rucore.libraries.rutgers.edu/rutgers-lib/47621/.

MLA Handbook (7^th Edition):

Zheng, Yang. “Rational design and synthesize sterically less hindered pincer-iridium catalysts for alkane dehydrogenation.” 2015. Web. 06 Mar 2021.

Vancouver:

Zheng Y. Rational design and synthesize sterically less hindered pincer-iridium catalysts for alkane dehydrogenation. [Internet] [Masters thesis]. Rutgers University; 2015. [cited 2021 Mar 06]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/47621/.

Council of Science Editors:

Zheng Y. Rational design and synthesize sterically less hindered pincer-iridium catalysts for alkane dehydrogenation. [Masters Thesis]. Rutgers University; 2015. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/47621/

Universiteit Utrecht

12. Sattler, Jesper. Propane Dehydrogenation on Metal and Metal Oxide Catalysts.

Degree: 2014, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/307930

► In this PhD thesis, the catalytic performance and deactivation of various propane dehydrogenation catalysts is studied. First of all, a literature study is performed, where… (more)

▼ In this PhD thesis, the catalytic performance and deactivation of various propane dehydrogenation catalysts is studied. First of all, a literature study is performed, where the three most commonly used formulations, namely Pt-, CrOx- and GaOx-based catalysts are compared in terms of yield relative to space velocity and deactivation rate. It was found that a supported Pt-Sn catalyst provided the more active and stable formulation at similar reaction conditions. Here, a novel catalyst based on 1000 ppm Pt and 3 wt% Ga supported on Al2O3 is reported, that provides a similar excellent activity and stability. A synergy between the two metals is observed, as the catalysts containing either Ga or Pt display significantly lower activities. After extensively characterizing the material, the synergy between the two metals is explained by the presence of a highly stable mixed Al-Ga oxide, on which the Pt is highly dispersed in sub-nanometer clusters. Surface Ga Lewis acid sites are believed to be responsible for the dehydrogenation activity, with the Pt providing a promoting function of facilitating the rate-limiting step of the reaction, which is the recombination of adsorbed hydrogen atoms. A second point of interest, was to use spectroscopic tools such as Raman spectroscopy and Scanning Transmission X-ray Microscopy (STXM) to study differences in the carbon deposits that are formed as a byproduct during the dehydrogenation reaction on the catalysts. Effects, such as the partial pressure of propane, propylene and hydrogen, temperature and catalyst material used were investigated. For example, bands corresponding with coke deposits change in the Raman spectra, as the partial pressure of hydrogen is increased. This suggests the formation of smaller, more graphitic carbon crystallites. As a second example, the coke formed on Pt, Pt-Sn, Ga and Pt-Ga/Al2O3 was compared. On the latter two catalyst, more coke was formed, which had a more graphitic nature. Finally, using STXM, heterogeneities in the coke formed on individual catalyst particles were observed. Specifically, coke formed on the outside of a catalyst particle has a different chemical nature than coke formed on the inside. Thirdly, the design, construction and testing of special probes to study the process of coke deposition and the consecutive combustion of the coke deposits, inside a propane dehydrogenation pilot scale plant was discussed. The probes are designed as such that they are able to withstand the harsh conditions of the propane dehydrogenation reaction, and that the tip does not foul during the reaction. The process of coke formation was studied at different heights of the catalyst bed, and it was found that the coke deposition is more rapid at the top of the catalyst bed, which is related to the temperature of the catalyst bed. Furthermore, by combining the information obtained by Raman and UV-Vis spectroscopy, quantitative information of the process of coke deposition was obtained during the first hour of the dehydrogenation reaction. Advisors/Committee Members: Weckhuysen, Bert.

Subjects/Keywords: Propane dehydrogenation; Catalysis; Coke deposition; Spectroscopy; Tools

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APA (6^th Edition):

Sattler, J. (2014). Propane Dehydrogenation on Metal and Metal Oxide Catalysts. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/307930

Chicago Manual of Style (16^th Edition):

Sattler, Jesper. “Propane Dehydrogenation on Metal and Metal Oxide Catalysts.” 2014. Doctoral Dissertation, Universiteit Utrecht. Accessed March 06, 2021. http://dspace.library.uu.nl:8080/handle/1874/307930.

MLA Handbook (7^th Edition):

Sattler, Jesper. “Propane Dehydrogenation on Metal and Metal Oxide Catalysts.” 2014. Web. 06 Mar 2021.

Vancouver:

Sattler J. Propane Dehydrogenation on Metal and Metal Oxide Catalysts. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2014. [cited 2021 Mar 06]. Available from: http://dspace.library.uu.nl:8080/handle/1874/307930.

Council of Science Editors:

Sattler J. Propane Dehydrogenation on Metal and Metal Oxide Catalysts. [Doctoral Dissertation]. Universiteit Utrecht; 2014. Available from: http://dspace.library.uu.nl:8080/handle/1874/307930

University of Manchester

13. Rallan, Chandni. Development of Novel structured catalysts and Testing for Dehydrogenation of Methylcyclohexane.

Degree: 2014, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:230934

► Hydrogen storage for stationary and mobile applications is an expanding research topic. Using liquid organic hydrides for hydrogen storage is one of the most promising… (more)

▼ Hydrogen storage for stationary and mobile applications is an expanding research topic. Using liquid organic hydrides for hydrogen storage is one of the most promising alternatives as it provides simple and safe handling. Liquid organic hydrides are largely compatible with current transport infrastructure, whereas alternatives such as liquid and gaseous hydrogen and metal hydrides would require a completely new infrastructure. An attractive storage system is the so-called MTH system (Methylcyclohexane, Toluene and Hydrogen). The dehydrogenation of methylcyclohexane is a highly endothermic reaction. To improve the reaction kinetics, this research was to develop a structured catalyst with a conductive metal support (Fecralloy) which could hold an adherent catalytic washcoat (γ - Al2O3). The active phase was impregnated onto this support and the developed catalyst was tested for the dehydrogenation of methylcyclohexane.The catalyst preparation involved three key steps which were support oxidation, loading of an adherent washcoat and finally impregnation of the active phase. The oxidation and washcoat stages required significant optimisation. The optimum oxidation conditions were found to be 950 °C for 10 h. The washcoating procedure was optimised by modifying a one-step hybrid washcoating method suggested in patent literature. Characterization techniques including SEM, XRD and EDX were used to study each step of catalyst preparation. In addition the technique of STEM was used to study platinum dispersion on the catalytic washcoat. Finally the catalytic activity of the developed catalyst was compared with an in-house pelleted catalyst based on the material used to prepare the structured catalyst and commercially available platinum on γ - Al2O3. Three key factors: activity, selectivity and stability were evaluated. The activity and selectivity were studied at varied operating conditions of T = 340 °C - 400 °C, W/F = 7345 - 14690 g s/mol, H2/MCH molar ratio = 0 - 9 and P = 1.013 bar. The dehydrogenation reaction of methylcyclohexane was found to be very selective to toluene (above 99%). Compounds, which are considered coke precursors, were identified, to attempt to explain the mechanism of catalyst deactivation. By-product distribution was monitored and possible reaction pathways were postulated. To gauge the stability of the catalyst, long term life tests were also performed on the structured catalyst at 400 °C and W/F = 14690 g s/mol for approximately 400 h. The stability study investigated the different types of deactivation mechanisms. The catalyst evaluation study helped identify the effect of the alloy support, the alumina washcoat and platinum dispersion on the selectivity of the catalyst. Advisors/Committee Members: Garforth, Arthur.

Subjects/Keywords: fecralloy; gamma alumina; methylcyclohexane; dehydrogenation; structured catalyst

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APA (6^th Edition):

Rallan, C. (2014). Development of Novel structured catalysts and Testing for Dehydrogenation of Methylcyclohexane. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:230934

Chicago Manual of Style (16^th Edition):

Rallan, Chandni. “Development of Novel structured catalysts and Testing for Dehydrogenation of Methylcyclohexane.” 2014. Doctoral Dissertation, University of Manchester. Accessed March 06, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:230934.

MLA Handbook (7^th Edition):

Rallan, Chandni. “Development of Novel structured catalysts and Testing for Dehydrogenation of Methylcyclohexane.” 2014. Web. 06 Mar 2021.

Vancouver:

Rallan C. Development of Novel structured catalysts and Testing for Dehydrogenation of Methylcyclohexane. [Internet] [Doctoral dissertation]. University of Manchester; 2014. [cited 2021 Mar 06]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:230934.

Council of Science Editors:

Rallan C. Development of Novel structured catalysts and Testing for Dehydrogenation of Methylcyclohexane. [Doctoral Dissertation]. University of Manchester; 2014. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:230934

14. Sangeetha, P. Hydrotalcite supported pd catalysts for hydrogenation dehydrogenation and combination reactions catalyst in a new role; -.

Degree: Science and Humanities, 2014, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/26863

►

Catalysis has a wide range of applications in chemical industry and newlinehas a major impact on the quality of human life as well as to… (more)

Subjects/Keywords: catalysts for hydrogenation; dehydrogenation; science and humanities

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APA (6^th Edition):

Sangeetha, P. (2014). Hydrotalcite supported pd catalysts for hydrogenation dehydrogenation and combination reactions catalyst in a new role; -. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/26863

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):

Sangeetha, P. “Hydrotalcite supported pd catalysts for hydrogenation dehydrogenation and combination reactions catalyst in a new role; -.” 2014. Thesis, Anna University. Accessed March 06, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/26863.

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

MLA Handbook (7^th Edition):

Sangeetha, P. “Hydrotalcite supported pd catalysts for hydrogenation dehydrogenation and combination reactions catalyst in a new role; -.” 2014. Web. 06 Mar 2021.

Vancouver:

Sangeetha P. Hydrotalcite supported pd catalysts for hydrogenation dehydrogenation and combination reactions catalyst in a new role; -. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Mar 06]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26863.

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

Council of Science Editors:

Sangeetha P. Hydrotalcite supported pd catalysts for hydrogenation dehydrogenation and combination reactions catalyst in a new role; -. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26863

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

University of KwaZulu-Natal

15. Naicker, Kershen. The oxidative dehydrogenation of ɳ-octane using manganese oxide supported on SBA-15 catalysts.

Degree: Chemistry, 2014, University of KwaZulu-Natal

URL: http://hdl.handle.net/10413/12887

► Supported metal oxides have been widely used in heterogeneous catalysis, particularly for the activation of paraffin’s. For this study, manganese oxide supported on SBA-15 was… (more)

▼ Supported metal oxides have been widely used in heterogeneous catalysis, particularly for the activation of paraffin’s. For this study, manganese oxide supported on SBA-15 was used to investigate the oxidative dehydrogenation of ɳ-octane. Wet impregnation was used firstly to synthesize catalysts with clusters of manganese oxide on the surface of the SBA-15 support. Thereafter, deposition precipitation was used to prepare catalysts with metal oxides in the pores of the SBA-15 support. Weight loadings of 2, 5 and 9 weight percent were synthesized for both groups of catalysts. Catalysts were characterized by inductively coupled plasma – optical emission spectroscopy, Raman spectroscopy, powder and in situ X-ray diffraction, temperature programmed analyses, oxygen chemisorption, nitrogen physiorption, Brunauer-Emmet-Teller surface analyses, transmission electron microscopy and scanning electron microscopy with energy dispersive X-ray spectroscopy. With most characterization techniques, clear differences were seen for catalysts with metal oxide on the surface of the support when compared to those with metal oxide in the pores of the SBA-15 support at the same weight loadings. However, the dominant phase present at room temperature was found to be Mn₃O₄ for both groups of catalysts, with a phase change to MnO taking place after reduction similarly for both groups of catalysts. The catalysts were tested in a continuous flow fixed-bed reactor system. The support and all catalysts were found to be active for the oxidative dehydrogenation of ɳ-octane. Dominant product groups obtained were octene isomers, aromatic compounds, cracked products and carbon oxides. Desired products groups were octene isomers and aromatic compounds and based on this and conversions of ɳ-octane, reaction conditions were optimized and all catalysts were tested and compared under optimum conditions. From the results obtained, insight into product pathways were obtained and a reaction mechanism was proposed for this metal oxide system. The 9 weight percent catalysts were found to provide the best conversions for both groups of catalysts, with catalysts having metal oxide on the surface displaying greater conversion than catalysts with metal oxides in the pores of the SBA-15 support, likely due to the enhanced accessibility of the active site. The lower accessibility of the active site did however lead to one product group having high selectivity for catalysts with metal oxide in the pores, with carbon oxides and octenes being the most selective product group for the 2 and 9 weight percent catalysts respectively. Advisors/Committee Members: Friedrich, Holger Bernhard. (advisor), Singh, Sooboo. (advisor).

Subjects/Keywords: Chemistry.; SBA-15 catalysts.; Oxidative dehydrogenation.

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APA (6^th Edition):

Naicker, K. (2014). The oxidative dehydrogenation of ɳ-octane using manganese oxide supported on SBA-15 catalysts. (Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/12887

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):

Naicker, Kershen. “The oxidative dehydrogenation of ɳ-octane using manganese oxide supported on SBA-15 catalysts.” 2014. Thesis, University of KwaZulu-Natal. Accessed March 06, 2021. http://hdl.handle.net/10413/12887.

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

MLA Handbook (7^th Edition):

Naicker, Kershen. “The oxidative dehydrogenation of ɳ-octane using manganese oxide supported on SBA-15 catalysts.” 2014. Web. 06 Mar 2021.

Vancouver:

Naicker K. The oxidative dehydrogenation of ɳ-octane using manganese oxide supported on SBA-15 catalysts. [Internet] [Thesis]. University of KwaZulu-Natal; 2014. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10413/12887.

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

Council of Science Editors:

Naicker K. The oxidative dehydrogenation of ɳ-octane using manganese oxide supported on SBA-15 catalysts. [Thesis]. University of KwaZulu-Natal; 2014. Available from: http://hdl.handle.net/10413/12887

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

Georgia Tech

16. Allen, William. An investigation of some salts of 1-abietic acid and the dehydrogenation of 1-abietic acid.

Degree: MS, Chemistry, 1942, Georgia Tech

URL: http://hdl.handle.net/1853/31086

Subjects/Keywords: Abietic acid; Dehydrogenation

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

APA (6^th Edition):

Allen, W. (1942). An investigation of some salts of 1-abietic acid and the dehydrogenation of 1-abietic acid. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/31086

Chicago Manual of Style (16^th Edition):

Allen, William. “An investigation of some salts of 1-abietic acid and the dehydrogenation of 1-abietic acid.” 1942. Masters Thesis, Georgia Tech. Accessed March 06, 2021. http://hdl.handle.net/1853/31086.

MLA Handbook (7^th Edition):

Allen, William. “An investigation of some salts of 1-abietic acid and the dehydrogenation of 1-abietic acid.” 1942. Web. 06 Mar 2021.

Vancouver:

Allen W. An investigation of some salts of 1-abietic acid and the dehydrogenation of 1-abietic acid. [Internet] [Masters thesis]. Georgia Tech; 1942. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/1853/31086.

Council of Science Editors:

Allen W. An investigation of some salts of 1-abietic acid and the dehydrogenation of 1-abietic acid. [Masters Thesis]. Georgia Tech; 1942. Available from: http://hdl.handle.net/1853/31086

King Abdullah University of Science and Technology

17. Alobaid, Nasser A. N-alkylation of amines via dehydrogenative coupling with alcohol catalyzed by the well-defined PN3 rhenium pincer complex.

Degree: Physical Science and Engineering (PSE) Division, 2020, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/662703

► Transition metals are known to be the essential part in most of the catalysts, the heterogeneous and the homogenous catalysts; however, the ligands that attached… (more)

Subjects/Keywords: N-alkylation; Hydrogenation; Dehydrogenation; Coupling; Pincer; Rhenium

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APA (6^th Edition):

Alobaid, N. A. (2020). N-alkylation of amines via dehydrogenative coupling with alcohol catalyzed by the well-defined PN3 rhenium pincer complex. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/662703

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):

Alobaid, Nasser A. “N-alkylation of amines via dehydrogenative coupling with alcohol catalyzed by the well-defined PN3 rhenium pincer complex.” 2020. Thesis, King Abdullah University of Science and Technology. Accessed March 06, 2021. http://hdl.handle.net/10754/662703.

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

MLA Handbook (7^th Edition):

Alobaid, Nasser A. “N-alkylation of amines via dehydrogenative coupling with alcohol catalyzed by the well-defined PN3 rhenium pincer complex.” 2020. Web. 06 Mar 2021.

Vancouver:

Alobaid NA. N-alkylation of amines via dehydrogenative coupling with alcohol catalyzed by the well-defined PN3 rhenium pincer complex. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2020. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10754/662703.

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

Council of Science Editors:

Alobaid NA. N-alkylation of amines via dehydrogenative coupling with alcohol catalyzed by the well-defined PN3 rhenium pincer complex. [Thesis]. King Abdullah University of Science and Technology; 2020. Available from: http://hdl.handle.net/10754/662703

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

18. 市川, 尚紀. Study on synthesis of valuable compounds from diols : ジオール由来の化成品合成に関する研究.

Degree: Chiba University / 千葉大学

URL: http://opac.ll.chiba-u.jp/da/curator/900047508/

研究科: 千葉大学大学院自然科学研究科

千大院自博甲第工378号

修了年: 2005

Advisors/Committee Members: 千葉大学大学院自然科学研究科.

Subjects/Keywords: CeO₂; Diols; Dehydration; Dehydrogenation

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APA (6^th Edition):

市川, �. (n.d.). Study on synthesis of valuable compounds from diols : ジオール由来の化成品合成に関する研究. (Thesis). Chiba University / 千葉大学. Retrieved from http://opac.ll.chiba-u.jp/da/curator/900047508/

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

市川, 尚紀. “Study on synthesis of valuable compounds from diols : ジオール由来の化成品合成に関する研究.” Thesis, Chiba University / 千葉大学. Accessed March 06, 2021. http://opac.ll.chiba-u.jp/da/curator/900047508/.

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

市川, 尚紀. “Study on synthesis of valuable compounds from diols : ジオール由来の化成品合成に関する研究.” Web. 06 Mar 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

市川 �. Study on synthesis of valuable compounds from diols : ジオール由来の化成品合成に関する研究. [Internet] [Thesis]. Chiba University / 千葉大学; [cited 2021 Mar 06]. Available from: http://opac.ll.chiba-u.jp/da/curator/900047508/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Council of Science Editors:

市川 �. Study on synthesis of valuable compounds from diols : ジオール由来の化成品合成に関する研究. [Thesis]. Chiba University / 千葉大学; Available from: http://opac.ll.chiba-u.jp/da/curator/900047508/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

NSYSU

19. Chen, Wei-Chih. First-Principles Studies of Thermodynamic Properties and Dehydrogenation Processes of Hydrogen Storage Material (LiBH4)n Nanoclusters.

Degree: Master, Physics, 2014, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0726114-165459

► Several experimental studies have found improved thermodynamic, kinetic, and reversibility properties when LiBH4 is confined in nano-porous materials. In this study, we used Monte Carlo… (more)

Subjects/Keywords: LiBH4; nanoclusters; dehydrogenation; reaction temperature; reaction path; first principles; hydrogen storage

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

APA (6^th Edition):

Chen, W. (2014). First-Principles Studies of Thermodynamic Properties and Dehydrogenation Processes of Hydrogen Storage Material (LiBH4)n Nanoclusters. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0726114-165459

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):

Chen, Wei-Chih. “First-Principles Studies of Thermodynamic Properties and Dehydrogenation Processes of Hydrogen Storage Material (LiBH4)n Nanoclusters.” 2014. Thesis, NSYSU. Accessed March 06, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0726114-165459.

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

MLA Handbook (7^th Edition):

Chen, Wei-Chih. “First-Principles Studies of Thermodynamic Properties and Dehydrogenation Processes of Hydrogen Storage Material (LiBH4)n Nanoclusters.” 2014. Web. 06 Mar 2021.

Vancouver:

Chen W. First-Principles Studies of Thermodynamic Properties and Dehydrogenation Processes of Hydrogen Storage Material (LiBH4)n Nanoclusters. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Mar 06]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0726114-165459.

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

Council of Science Editors:

Chen W. First-Principles Studies of Thermodynamic Properties and Dehydrogenation Processes of Hydrogen Storage Material (LiBH4)n Nanoclusters. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0726114-165459

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

University of Alberta

20. Yu, Zhengnan. Ethane Dehydrogenation Using a Catalytic Membrane Reactor.

Degree: MS, Department of Chemical and Materials Engineering, 2014, University of Alberta

URL: https://era.library.ualberta.ca/files/8336h342b

► The steam cracking of hydrocarbons is the dominant technology for ethylene production and is a highly energy intensive process. The increasing demand for ethylene has… (more)

Subjects/Keywords: Zeolite; Etahne; Mordenite; Membrane Reactor; Dehydrogenation; Ethylene; Catalsyt; ETS-2

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

APA (6^th Edition):

Yu, Z. (2014). Ethane Dehydrogenation Using a Catalytic Membrane Reactor. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/8336h342b

Chicago Manual of Style (16^th Edition):

Yu, Zhengnan. “Ethane Dehydrogenation Using a Catalytic Membrane Reactor.” 2014. Masters Thesis, University of Alberta. Accessed March 06, 2021. https://era.library.ualberta.ca/files/8336h342b.

MLA Handbook (7^th Edition):

Yu, Zhengnan. “Ethane Dehydrogenation Using a Catalytic Membrane Reactor.” 2014. Web. 06 Mar 2021.

Vancouver:

Yu Z. Ethane Dehydrogenation Using a Catalytic Membrane Reactor. [Internet] [Masters thesis]. University of Alberta; 2014. [cited 2021 Mar 06]. Available from: https://era.library.ualberta.ca/files/8336h342b.

Council of Science Editors:

Yu Z. Ethane Dehydrogenation Using a Catalytic Membrane Reactor. [Masters Thesis]. University of Alberta; 2014. Available from: https://era.library.ualberta.ca/files/8336h342b

University of Alberta

21. Rivard, Jean-Marc. Kinetics of the catalytic dehydration of 2-propanol in an aqueous medium.

Degree: MSin Chemical Engineering, Department of Chemical and Materials Engineering, 2000, University of Alberta

URL: https://era.library.ualberta.ca/files/p8418r40p

Subjects/Keywords: Dehydrogenation.; Catalysis.; Propanols.; Water – Purification.

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APA (6^th Edition):

Rivard, J. (2000). Kinetics of the catalytic dehydration of 2-propanol in an aqueous medium. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/p8418r40p

Chicago Manual of Style (16^th Edition):

Rivard, Jean-Marc. “Kinetics of the catalytic dehydration of 2-propanol in an aqueous medium.” 2000. Masters Thesis, University of Alberta. Accessed March 06, 2021. https://era.library.ualberta.ca/files/p8418r40p.

MLA Handbook (7^th Edition):

Rivard, Jean-Marc. “Kinetics of the catalytic dehydration of 2-propanol in an aqueous medium.” 2000. Web. 06 Mar 2021.

Vancouver:

Rivard J. Kinetics of the catalytic dehydration of 2-propanol in an aqueous medium. [Internet] [Masters thesis]. University of Alberta; 2000. [cited 2021 Mar 06]. Available from: https://era.library.ualberta.ca/files/p8418r40p.

Council of Science Editors:

Rivard J. Kinetics of the catalytic dehydration of 2-propanol in an aqueous medium. [Masters Thesis]. University of Alberta; 2000. Available from: https://era.library.ualberta.ca/files/p8418r40p

University of Oxford

22. Spearing-Ewyn, E. Anastasia K. Rhodium "PONOP" pincer complexes for amine-borane dehydrogenation.

Degree: PhD, 2020, University of Oxford

URL: http://ora.ox.ac.uk/objects/uuid:4c20858a-1917-4105-91fc-44ee6ed83c66 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808292

► This thesis explores the reactivity of the {Rh(PONOP)}⁺ fragment with the tertiary amine-borane, H₃B·NMe₃, and the secondary amine-borane, H₃B·NMe₂H, with an overall aim of gaining… (more)

Subjects/Keywords: Amine-borane dehydrogenation; Organometallic catalysis; Reduction of CO2

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APA (6^th Edition):

Spearing-Ewyn, E. A. K. (2020). Rhodium "PONOP" pincer complexes for amine-borane dehydrogenation. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:4c20858a-1917-4105-91fc-44ee6ed83c66 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808292

Chicago Manual of Style (16^th Edition):

Spearing-Ewyn, E Anastasia K. “Rhodium "PONOP" pincer complexes for amine-borane dehydrogenation.” 2020. Doctoral Dissertation, University of Oxford. Accessed March 06, 2021. http://ora.ox.ac.uk/objects/uuid:4c20858a-1917-4105-91fc-44ee6ed83c66 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808292.

MLA Handbook (7^th Edition):

Spearing-Ewyn, E Anastasia K. “Rhodium "PONOP" pincer complexes for amine-borane dehydrogenation.” 2020. Web. 06 Mar 2021.

Vancouver:

Spearing-Ewyn EAK. Rhodium "PONOP" pincer complexes for amine-borane dehydrogenation. [Internet] [Doctoral dissertation]. University of Oxford; 2020. [cited 2021 Mar 06]. Available from: http://ora.ox.ac.uk/objects/uuid:4c20858a-1917-4105-91fc-44ee6ed83c66 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808292.

Council of Science Editors:

Spearing-Ewyn EAK. Rhodium "PONOP" pincer complexes for amine-borane dehydrogenation. [Doctoral Dissertation]. University of Oxford; 2020. Available from: http://ora.ox.ac.uk/objects/uuid:4c20858a-1917-4105-91fc-44ee6ed83c66 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.808292

23. Lawrence, Praveen Samuel. Distribution of functionalities at different scales within a multifunctional reactor.

Degree: 2008, Technische Universität Dortmund

URL: http://hdl.handle.net/2003/26002

►

Die Leistung heterogener Katalysatorsysteme unterliegt dem Einfluß von Massen- und Wärmetransportphänomenen innerhalb des Katalysator-korns. Obwohl allgemein Transportwiderstände als leistungsmindernd angesehen werden, konnte nachgewiesen werden, dass… (more)

▼

Die Leistung heterogener Katalysatorsysteme unterliegt dem Einfluß von Massen- und Wärmetransportphänomenen innerhalb des Katalysator-korns. Obwohl allgemein Transportwiderstände als leistungsmindernd angesehen werden, konnte nachgewiesen werden, dass eine durchdachte Verteilung der Aktivitäten innerhalb des Katalysatorkorns die Transportlimitierung ausnutzen kann, um die Prozesseffizienz zu steigern (Morbidelli, et al., 1982). Analog wurden räumlich strukturierende Studien auf Reaktorniveau durchgeführt. Diese Arbeit beleuchtet den potentiellen Nutzen der Strukturierung von Funktionalitäten in multifunktionalen Katalysatorsystemen, sowohl innerhalb des Katalysatorkorns, als auch des Reaktors. Das Konzept der räumlichen Strukturierung in multifunktionalen Reaktoren wird anhand zweier Beispiele illustriert: adsorptive Reaktoren für den Clausprozeß und die bifunktional katalysierte Styrolsynthese unter Einsatz oxidativer Wärmespeicher-Technologie. Die Annäherung an den Gleichgewichtszustand ist eine hilfreiche Größe, um zu bestimmen, wie eine zweckmäßige Strukturierung im Reaktor stattfinden kann. Im Wesentlichen können die folgenden Schlüsse aus dieser Arbeit gezogen werden: - Strukturierung ist ein ausschlaggebender Entscheidendungsparameter in jedem multifunktionalen Reaktor; - Eine optimale Verteilung von Funktionalitäten auf Reaktorebene (Makrostrukturierung) verbessert die Leistung des Reaktors und die optimale Makrostruktur kann auch einfach eine gleichmäßige Verteilung der Funktionalitäten über die Reaktorlänge sein; - Integration der Funktionalitäten auf Katalysatorkornebene umgeht Transportlimitierungen und verbessert die Reaktorgesamtleistung; - Mikrostrukturierung kann die Leistung des Prozesses verbessern, obwohl meist die Mikrointegration der Funktionalitäten ausreicht.

The performance of heterogeneous catalyst systems are influenced by mass and heat transport phenomena occurring in the catalyst pellet. Although, in general, transport resistances may be viewed as detrimental to the performance of catalysts, it has been demonstrated that a prudent structuring of catalyst activity within the pellet can actually exploit the transport limitations to enhance process performance (Morbidelli, et al., 1982). Analogous spatial structuring studies have also been carried out at a reactor level. This work highlights the potential benefits of a structured distribution of functionalities in multifunctional reactor systems at both the pellet and reactor levels. The concept of spatial structuring in multifunctional reactors is illustrated using two case studies - adsorptive reactors for the Claus process and bifunctional catalysts for styrene synthesis using oxidative reheat technology. The "approach to equilibrium" is a useful parameter to analyse how structuring can be carried out expediently within a reactor. The following key conclusions can be drawn from the work done: - structuring is crucial decision variable for any multifunctional reactor; - optimal distribution of functionalities at a reactor level…

Advisors/Committee Members: Agar, David.

Subjects/Keywords: adsorptive reactor; Claus process; multifunctional reactor; oxidative dehydrogenation; 660

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APA (6^th Edition):

Lawrence, P. S. (2008). Distribution of functionalities at different scales within a multifunctional reactor. (Thesis). Technische Universität Dortmund. Retrieved from http://hdl.handle.net/2003/26002

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):

Lawrence, Praveen Samuel. “Distribution of functionalities at different scales within a multifunctional reactor.” 2008. Thesis, Technische Universität Dortmund. Accessed March 06, 2021. http://hdl.handle.net/2003/26002.

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

MLA Handbook (7^th Edition):

Lawrence, Praveen Samuel. “Distribution of functionalities at different scales within a multifunctional reactor.” 2008. Web. 06 Mar 2021.

Vancouver:

Lawrence PS. Distribution of functionalities at different scales within a multifunctional reactor. [Internet] [Thesis]. Technische Universität Dortmund; 2008. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/2003/26002.

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

Council of Science Editors:

Lawrence PS. Distribution of functionalities at different scales within a multifunctional reactor. [Thesis]. Technische Universität Dortmund; 2008. Available from: http://hdl.handle.net/2003/26002

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

Penn State University

24. Nguyen, Jennifer M. The Underfunctionalization of Alcohols by Heterogeneous Catalysts .

Degree: 2009, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/9898

► Finite oil reserves along with worries of global warning suggest that alternative sources of fuel are necessary in the future, especially for the transportation industry.… (more)

Subjects/Keywords: alcohols; dehydrogenation; dehydration; biofuels; catalysis

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APA (6^th Edition):

Nguyen, J. M. (2009). The Underfunctionalization of Alcohols by Heterogeneous Catalysts . (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/9898

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):

Nguyen, Jennifer M. “The Underfunctionalization of Alcohols by Heterogeneous Catalysts .” 2009. Thesis, Penn State University. Accessed March 06, 2021. https://submit-etda.libraries.psu.edu/catalog/9898.

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

MLA Handbook (7^th Edition):

Nguyen, Jennifer M. “The Underfunctionalization of Alcohols by Heterogeneous Catalysts .” 2009. Web. 06 Mar 2021.

Vancouver:

Nguyen JM. The Underfunctionalization of Alcohols by Heterogeneous Catalysts . [Internet] [Thesis]. Penn State University; 2009. [cited 2021 Mar 06]. Available from: https://submit-etda.libraries.psu.edu/catalog/9898.

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

Council of Science Editors:

Nguyen JM. The Underfunctionalization of Alcohols by Heterogeneous Catalysts . [Thesis]. Penn State University; 2009. Available from: https://submit-etda.libraries.psu.edu/catalog/9898

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

25. Park, Justin Lane. The Investigation of Nickel-Based Catalysts for the Oxidative Dehydrogenation of Ethane.

Degree: PhD, 2019, Brigham Young University

URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8393&context=etd

► The Investigation of Nickel-Based Catalysts for the Oxidative Dehydrogenation of Ethane Justin Lane ParkDepartment of Chemistry & Biochemistry, BYU Doctor of Philosophy Chemistry The advancement… (more)

▼ The Investigation of Nickel-Based Catalysts for the Oxidative Dehydrogenation of Ethane Justin Lane ParkDepartment of Chemistry & Biochemistry, BYU Doctor of Philosophy Chemistry The advancement of creating ethylene from ethane via oxidative dehydrogenation (ODH) rather than the traditional direct dehydrogenation is right on the cusp of commercialization. The oxidative pathway provides a novel route that reduces the operating temperature of this reaction by 400-500°C. A variety of metals including Mo, V, and Ni that have redox properties suitable for the partial oxidation of small chain alkanes have been investigated. Currently, a MoVNbTe oxide is the most promising catalyst but it suffers from a long and difficult preparation method and the combination of four expensive metals. Nickel based catalysts have also shown great promise but are limited by the reactivity of the oxygen species on the surface of the catalyst. In this manuscript, the details for improving the activity of the nickel and altering the activation mechanism are outlined.Bulk CeNiNb oxide catalysts were shown to almost double the rate of ethylene yields at temperatures as low as 300°C. This is partially related to the improved rate of oxygen adsorption and transfer to the active oxygens on the nickel oxide via the ceria additive. However, with further characterization of these materials, it was shown that there is likely an interaction between the Ce and Nb, forming a Ce-O- Nb linkage that is also selective towards ethylene. This facilitates a higher activity of the catalyst by creating two redox active sites. The improved rates of ethylene formation observed with these catalysts led to the initial development of a commercially viable nickel based catalyst. The support interactions of NiO with a novel silica doped alumina support show higher yields than previously reported studies of NiO on alumina for ODH. These initial metal support interactions show that the addition of the niobium and ceria to this catalyst should give ethylene yields that are satisfactory for the commercialization of this catalyst.

Subjects/Keywords: Catalysis; Oxidative Dehydrogenation; Nickel; Ceria; Niobium; Titania; Alumina support

10 more images…

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APA (6^th Edition):

Park, J. L. (2019). The Investigation of Nickel-Based Catalysts for the Oxidative Dehydrogenation of Ethane. (Doctoral Dissertation). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8393&context=etd

Chicago Manual of Style (16^th Edition):

Park, Justin Lane. “The Investigation of Nickel-Based Catalysts for the Oxidative Dehydrogenation of Ethane.” 2019. Doctoral Dissertation, Brigham Young University. Accessed March 06, 2021. https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8393&context=etd.

MLA Handbook (7^th Edition):

Park, Justin Lane. “The Investigation of Nickel-Based Catalysts for the Oxidative Dehydrogenation of Ethane.” 2019. Web. 06 Mar 2021.

Vancouver:

Park JL. The Investigation of Nickel-Based Catalysts for the Oxidative Dehydrogenation of Ethane. [Internet] [Doctoral dissertation]. Brigham Young University; 2019. [cited 2021 Mar 06]. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8393&context=etd.

Council of Science Editors:

Park JL. The Investigation of Nickel-Based Catalysts for the Oxidative Dehydrogenation of Ethane. [Doctoral Dissertation]. Brigham Young University; 2019. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8393&context=etd

University of Delaware

26. Schreiner, Edward P. Manipulation of zeolite active site acidity and atomic structure to control hydrocarbon conversion and selectivity.

Degree: PhD, University of Delaware, Department of Chemical and Biomolecular Engineering, 2017, University of Delaware

URL: http://udspace.udel.edu/handle/19716/23515

► Hydrocarbon conversion processes change the molecular weight, structure, and H/C ratio of the feed stream and are vital for supplying fuels, petrochemicals, and many other… (more)

▼ Hydrocarbon conversion processes change the molecular weight, structure, and H/C ratio of the feed stream and are vital for supplying fuels, petrochemicals, and many other valuable molecules to the world. These processes include cracking, isomerization, dehydrogenation, hydrotreating, polymerization, and many more. Zeolites – nanoporous crystalline aluminosilicates that have molecular-sized pores and channels – are among the most frequently used catalysts. They can be prepared from just silicon and oxygen – a purely siliceous sample – or with heteroatom substitution into the framework. If the heteroatom is trivalent, such as aluminum, the framework becomes negatively charged and a cation must be added for charge balance. When a proton is used for charge balance, a Brønsted acid site is generated, and the acid strength of the proton can be modulated by the trivalent heteroatom substituted into the framework, affecting the relative rates of the hydrocarbon conversion processes. In this thesis, we investigated the influence of acid strength on high-pressure catalytic cracking and dehydrogenation for aircraft endothermic cooling, as well as methanol conversion to hydrocarbons (MTH), by changing the heteroatom substituted into the zeolite framework. ☐ The first process investigated was high-pressure catalytic cracking of n-pentane on acidic H-[Al]ZSM-5 to produce light olefins. Although ethylene and propylene were the targeted products, these were rapidly consumed via secondary bimolecular reactions, such as hydride transfer and oligomerization, leading to a reduction in reaction endothermicity. The second process investigated was high-pressure dehydrogenation of C5-C7 normal paraffins using supported molybdenum carbide nanoparticles. To reduce the secondary bimolecular reactions described above, weakly acidic H-[B]ZSM-5 was used as a support for molybdenum. By using H-[B]ZSM-5 as a support instead of γ-Al2O3, we were able to maintain high selectivity to the primary dehydrogenation product (>90%), while observing over a 100 percent increase in reactant consumption rates. ☐ The final process investigated was methanol conversion to produce olefins, with the intent of producing olefins larger than ones formed by zeolites such as H-SAPO-34 and H-[Al]ZSM-5. H-[Fe]Beta was selected for this reaction as iron zeolites have an acid strength sufficiently strong to catalyze methanol conversion, but slowly catalyzes hydride transfer reactions, a necessary condition to minimize aromatics formation. By using H-[Fe]Beta for the conversion of dimethyl ether, olefins were produced with greater than 90 percent selectivity with isobutene being the major product. ☐ Our research has shown that by changing the heteroatom substituted into the zeolite framework, we can adjust the acidity of the catalyst and alter the chemistry of hydrocarbon conversion processes to enhance selectivity and yield. Advisors/Committee Members: Lobo, Raul F..

Subjects/Keywords: Applied sciences; Cracking; Dehydrogenation; Heterogeneous catalysis; Metal carbides; Methanol conversion; Zeolites

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APA (6^th Edition):

Schreiner, E. P. (2017). Manipulation of zeolite active site acidity and atomic structure to control hydrocarbon conversion and selectivity. (Doctoral Dissertation). University of Delaware. Retrieved from http://udspace.udel.edu/handle/19716/23515

Chicago Manual of Style (16^th Edition):

Schreiner, Edward P. “Manipulation of zeolite active site acidity and atomic structure to control hydrocarbon conversion and selectivity.” 2017. Doctoral Dissertation, University of Delaware. Accessed March 06, 2021. http://udspace.udel.edu/handle/19716/23515.

MLA Handbook (7^th Edition):

Schreiner, Edward P. “Manipulation of zeolite active site acidity and atomic structure to control hydrocarbon conversion and selectivity.” 2017. Web. 06 Mar 2021.

Vancouver:

Schreiner EP. Manipulation of zeolite active site acidity and atomic structure to control hydrocarbon conversion and selectivity. [Internet] [Doctoral dissertation]. University of Delaware; 2017. [cited 2021 Mar 06]. Available from: http://udspace.udel.edu/handle/19716/23515.

Council of Science Editors:

Schreiner EP. Manipulation of zeolite active site acidity and atomic structure to control hydrocarbon conversion and selectivity. [Doctoral Dissertation]. University of Delaware; 2017. Available from: http://udspace.udel.edu/handle/19716/23515

27. Kazmierczak, Kamila Maria. Heterogeneous catalysts for acceptor-less alcohol dehydrogenation - joined experimental and theoretical studies : Catalyseurs hétérogènes pour déshydrogénation d'alcool sans accepteur - études expérimentales et théoriques conjointes.

Degree: Docteur es, Chimie, 2019, Lyon

URL: http://www.theses.fr/2019LYSEN045

►

La déshydrogénation d’alcool sans accepteur est une réaction extrêmement intéressante du point de vue de la chimie verte. Dans celle-ci, les alcools (dérivés de la… (more)

▼

La déshydrogénation d’alcool sans accepteur est une réaction extrêmement intéressante du point de vue de la chimie verte. Dans celle-ci, les alcools (dérivés de la biomasse) sont transformés en produits carbonylés, qui sont des produits chimiques à haute valeur ajoutée. De plus, de l’hydrogène est produit hautement énergétique, sous forme gazeuse, comme seul sous-produit de la réaction. La présence de catalyseur facilite le processus. Des catalyseurs hétérogènes au cobalt supportés et des nanoparticules façonnées sans support ont été étudiés dans cette réaction. Pour comprendre leurs performances catalytiques, les approches expérimentales et théoriques ont été reliées. Les tests catalytiques visaient à évaluer l'activité et la sélectivité des catalyseurs vis-à-vis de la déshydrogénation de mono- et polyalcools (diols) possédant des groupes hydroxyle primaires et secondaires. Une caractérisation poussée a permis d’evaluer les propriétés intrinsèques des matériaux. La réductibilité du cobalt sur des supports de nature différente a été examinée. Pour les nanoparticules non supportées, la forme, le type de facettes métalliques exposées et l'épaisseur de la couche de ligand protégeant les nanoparticules ont été analysés. Les calculs de la théorie fonctionnelle de la densité (DFT) ont permis de comprendre le comportement catalytique au niveau moléculaire. L'activité catalytique et la sélectivité, ont été étudiées pour des surfaces de Co de différentes natures ainsi que l'influence des ligands co-adsorbés. En combinant tous les résultats, il a été possible d'identifier les facteurs guidant l'activité du catalyseur.

Acceptor-less alcohol dehydrogenation is a highly interesting reaction from the green chemistry point of view. In it, the (biomass derived) alcohols are transformed into carbonyl products, which are high value-added chemicals. Moreover, highly-energetic H2 in gaseous form is produced as the only by-product in the reaction. The presence of catalyst facilitates the process. Cobalt heterogeneous supported catalysts and unsupported shaped nanoparticles were investigated in this reaction. To understand their catalytic performance, the experimental and theoretical approaches were joined. Catalytic testing was aiming to assess the activity and selectivity of the catalysts, towards the dehydrogenation of mono- and polyalcohols (diols) possessing primary and secondary hydroxyl groups. Extensive characterization allowed to investigate the intrinsic properties of the materials. In between the reducibility of cobalt supported on materials of different nature was examined. For unsupported nanoparticles the shape, type of exposed metal facets, and also thickness of the ligand layer protecting the nanoparticles were analyzed. Density Functional Theory (DFT) calculations gave the opportunity to understand the catalytic behavior on the molecular level. The catalytic activity and selectivity, and the influence of the co-adsorbed ligands on the catalytic performance of metal, were studied for Co surfaces of different nature. By…

Advisors/Committee Members: Michel, Carine (thesis director).

Subjects/Keywords: Alcool; Déshydrogénation; Cobalt; Catalyse; DFT; Alcohol; Dehydrogenation; Cobalt; Catalysis; DFT

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APA (6^th Edition):

Kazmierczak, K. M. (2019). Heterogeneous catalysts for acceptor-less alcohol dehydrogenation - joined experimental and theoretical studies : Catalyseurs hétérogènes pour déshydrogénation d'alcool sans accepteur - études expérimentales et théoriques conjointes. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2019LYSEN045

Chicago Manual of Style (16^th Edition):

Kazmierczak, Kamila Maria. “Heterogeneous catalysts for acceptor-less alcohol dehydrogenation - joined experimental and theoretical studies : Catalyseurs hétérogènes pour déshydrogénation d'alcool sans accepteur - études expérimentales et théoriques conjointes.” 2019. Doctoral Dissertation, Lyon. Accessed March 06, 2021. http://www.theses.fr/2019LYSEN045.

MLA Handbook (7^th Edition):

Kazmierczak, Kamila Maria. “Heterogeneous catalysts for acceptor-less alcohol dehydrogenation - joined experimental and theoretical studies : Catalyseurs hétérogènes pour déshydrogénation d'alcool sans accepteur - études expérimentales et théoriques conjointes.” 2019. Web. 06 Mar 2021.

Vancouver:

Kazmierczak KM. Heterogeneous catalysts for acceptor-less alcohol dehydrogenation - joined experimental and theoretical studies : Catalyseurs hétérogènes pour déshydrogénation d'alcool sans accepteur - études expérimentales et théoriques conjointes. [Internet] [Doctoral dissertation]. Lyon; 2019. [cited 2021 Mar 06]. Available from: http://www.theses.fr/2019LYSEN045.

Council of Science Editors:

Kazmierczak KM. Heterogeneous catalysts for acceptor-less alcohol dehydrogenation - joined experimental and theoretical studies : Catalyseurs hétérogènes pour déshydrogénation d'alcool sans accepteur - études expérimentales et théoriques conjointes. [Doctoral Dissertation]. Lyon; 2019. Available from: http://www.theses.fr/2019LYSEN045

Michigan State University

28. Yedur, Sanjay Krishnamurthy. Development of a catalytic process for the production of maleic anhydride from a fermentation feedstock.

Degree: MS, Department of Chemical Engineering, 1992, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:24733

Subjects/Keywords: Maleic anhydride; Catalysts; Dehydrogenation

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

APA (6^th Edition):

Yedur, S. K. (1992). Development of a catalytic process for the production of maleic anhydride from a fermentation feedstock. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:24733

Chicago Manual of Style (16^th Edition):

Yedur, Sanjay Krishnamurthy. “Development of a catalytic process for the production of maleic anhydride from a fermentation feedstock.” 1992. Masters Thesis, Michigan State University. Accessed March 06, 2021. http://etd.lib.msu.edu/islandora/object/etd:24733.

MLA Handbook (7^th Edition):

Yedur, Sanjay Krishnamurthy. “Development of a catalytic process for the production of maleic anhydride from a fermentation feedstock.” 1992. Web. 06 Mar 2021.

Vancouver:

Yedur SK. Development of a catalytic process for the production of maleic anhydride from a fermentation feedstock. [Internet] [Masters thesis]. Michigan State University; 1992. [cited 2021 Mar 06]. Available from: http://etd.lib.msu.edu/islandora/object/etd:24733.

Council of Science Editors:

Yedur SK. Development of a catalytic process for the production of maleic anhydride from a fermentation feedstock. [Masters Thesis]. Michigan State University; 1992. Available from: http://etd.lib.msu.edu/islandora/object/etd:24733

University of Hawaii – Manoa

29. Wang, Zhaohui, 1972. Development of PCP pincer complexes as catalysts for organic transformations involving the activation of "unreactive" bonds.

Degree: PhD, 2009, University of Hawaii – Manoa

URL: http://hdl.handle.net/10125/11375

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xii, 111 leaves, bound ill. 29 cm

The attempted hydroxylation of cyclooctane catalyzed by the hydridohydroxo complex,… (more)

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Also available by subscription via World Wide Web

xii, 111 leaves, bound ill. 29 cm

The attempted hydroxylation of cyclooctane catalyzed by the hydridohydroxo complex, IrH(OH){C6H3-2,6-(CH2PBuᵗ2)2} (2), gives only cyclooctene and no oxygenated products such as alcohol or ketone. This observation reveals that a dissociative mechanism is involved in the dehydrogenation reaction. After comparing the kinetic aspects for the dehydrogenation of alkanes catalyzed by the dihydrido complexes, IrH2{C6H3-2,6-(CH2PBuᵗ2)2} (1), and complex 2, it is very clear that both complexes 1 and 2 undergo a dissociative pathway to form the same 14-electron Ir(I) intermediate (PCP)Ir through which the dehydrogenation of alkanes occurs. As an extension of our studies on the functionalization of the C-H bond, pincer-ligated platinum complexes, PtCl{C6H3-2,6-(CH2NEt2)2} (5), and the novel complex, PtCl{C6H3-2,6-(OPPrͥ2)2} (6), have been explored as C-H bond hydroxylation catalysts. Both complexes have been found to be much more active and selective catalysts than the original Shilov catalyst, [PtCl4]²ˉ for the conversion of 1-propanol to I,3-diol. Moreover, the pincer complexes catalyze this transformation even upon replacement of Pt(IV) salts by more economical CuCl2 as an oxidant. An intermediate complex from the catalytic sequence has been isolated and characterized. The mechanistic studies indicate that after replacing the Pt(IV) salt with CuCl2 the pincer complex-mediated hydroxylation process does not involve a classic Shilov-type mechanism. In addition to the activation of the C-H bond, the functionalization of the aryl-Cl bond was also explored. An effective one-pot catalytic system has been developed to apply the PCP pincer palladium complex, PdCl{C6H3-2,6-(OPPrͥ2)2} (3), as an active catalyst to mediate the cross-coupling reaction between phenylacetylene and a wide array of electronically deactivated, non-activated and activated as well as hindered aryl chlorides with modest to excellent yields. The presence of ZnCl2 is found to be essential to enhance the catalytic activity of complex 3.

Subjects/Keywords: Catalysts; Chemical bonds; Dehydrogenation; Hydroxylation

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

APA (6^th Edition):

Wang, Zhaohui, 1. (2009). Development of PCP pincer complexes as catalysts for organic transformations involving the activation of "unreactive" bonds. (Doctoral Dissertation). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/11375

Chicago Manual of Style (16^th Edition):

Wang, Zhaohui, 1972. “Development of PCP pincer complexes as catalysts for organic transformations involving the activation of "unreactive" bonds.” 2009. Doctoral Dissertation, University of Hawaii – Manoa. Accessed March 06, 2021. http://hdl.handle.net/10125/11375.

MLA Handbook (7^th Edition):

Wang, Zhaohui, 1972. “Development of PCP pincer complexes as catalysts for organic transformations involving the activation of "unreactive" bonds.” 2009. Web. 06 Mar 2021.

Vancouver:

Wang, Zhaohui 1. Development of PCP pincer complexes as catalysts for organic transformations involving the activation of "unreactive" bonds. [Internet] [Doctoral dissertation]. University of Hawaii – Manoa; 2009. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10125/11375.

Council of Science Editors:

Wang, Zhaohui 1. Development of PCP pincer complexes as catalysts for organic transformations involving the activation of "unreactive" bonds. [Doctoral Dissertation]. University of Hawaii – Manoa; 2009. Available from: http://hdl.handle.net/10125/11375

Georgia Tech

30. Choi, Seung Won. Experimental and modeling investigation of membrane reactor systems for propane dehydrogenation.

Degree: PhD, Chemical and Biomolecular Engineering, 2016, Georgia Tech

URL: http://hdl.handle.net/1853/58567

► The intensification of paraffin dehydrogenation processes is of increasing importance in the production of olefins, which are important petrochemical feedstocks. In this thesis, I conduct… (more)

Subjects/Keywords: Propane dehydrogenation; Membrane reactors; Zeolite membranes; Reactor design

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

APA (6^th Edition):

Choi, S. W. (2016). Experimental and modeling investigation of membrane reactor systems for propane dehydrogenation. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/58567

Chicago Manual of Style (16^th Edition):

Choi, Seung Won. “Experimental and modeling investigation of membrane reactor systems for propane dehydrogenation.” 2016. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021. http://hdl.handle.net/1853/58567.

MLA Handbook (7^th Edition):

Choi, Seung Won. “Experimental and modeling investigation of membrane reactor systems for propane dehydrogenation.” 2016. Web. 06 Mar 2021.

Vancouver:

Choi SW. Experimental and modeling investigation of membrane reactor systems for propane dehydrogenation. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/1853/58567.

Council of Science Editors:

Choi SW. Experimental and modeling investigation of membrane reactor systems for propane dehydrogenation. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/58567

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