Hydrogenation Of Alpha Methyl Styrene Over Palladium Catalyst In A Packed Bed With Cocurrent Downflowing Liquid And Gas Phases
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Hydrogenation Of Alpha Methyl Styrene Over Palladium Catalyst In A Packed Bed With Cocurrent Downflowing Liquid And Gas Phases
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Author : David George Reed Short
language : en
Publisher:
Release Date : 1970
Hydrogenation Of Alpha Methyl Styrene Over Palladium Catalyst In A Packed Bed With Cocurrent Downflowing Liquid And Gas Phases written by David George Reed Short and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.
Selective Hydrogenation Of Alpha Beta Alpha Beta Unsaturated Aldehydes Towards Clean Synthesis Over Noble Metal Catalysts In Mass Transfer Efficient Three Phase Reactors
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Author : Laiqi Zhang
language : en
Publisher:
Release Date : 1998
Selective Hydrogenation Of Alpha Beta Alpha Beta Unsaturated Aldehydes Towards Clean Synthesis Over Noble Metal Catalysts In Mass Transfer Efficient Three Phase Reactors written by Laiqi Zhang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
The hydrodynamics and mass transfer characteristics of a concurrent downflow contactor (CDC) are studied in this work in order to investigate the viability of this bubble column as a catalytic reactor for the hydrogenation of?,?-unsaturated aldehydes. Oxygen/water was used as the system throughout. In order to obtain reproducible results, a very effective gas-liquid separation method was conceived and developed after much trial and error work. Shutdown and deadleg gas holdup measuring methods were compared and it was found that the shutdown method is more reliable than the deadleg method. The hydrogenation of cinnamaldehyde using both in-house-prepared and commercial palladium, platinum and ruthenium catalysts was carried out in stirred tank reactors and cocurrent downflow reactors in order to study the kinetics and mass transfer characteristics and the selectivity towards the corresponding desired product, hydrocinnamaldehyde or cinnamyl alcohol. When palladium catalysts were used the desired product was hydrocinnamaldehyde. The effects of homogenous reactions, type of solvent, catalyst loading, temperature, pressure, reactant concentration and the effects of promoter or poison on the selectivity towards hydrocinnamaldehyde were investigated systematically. Aldehyde acetals were produced in polar solvents, but not in non-polar solvents. Two methods can be used to obtain hydrocinnamaldehyde selectivity without reduction of the carbonyl double bond: (1) by using non-polar solvents such as toluene; (2) by incorporating poisons or promoters into the reactant solution or onto the surface of the catalysts. 97% selectivity to hydrocinnamaldehyde was achieved. The effects of the solvent, temperature, pressure, catalyst loading, promoters, and reactants concentration on the kinetics were studied and the following reaction kinetics are proposed for the hydrogenation of cinnamaldehyde over non-modified palladium/charcoal catalysts in propan-2-ol and in toluene: Ra = kC\(_{Cat}\)C\(_{H2}\)C\(0_{CAL}\) The apparent activation energy varies with themperature range in propan-2-ol and is 65\(\pm\)5 kJ.mol\({-1}\) in toluene.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 1973
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Dissertations, Academic categories.
Comprehensive Dissertation Index
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Author :
language : en
Publisher:
Release Date : 1984
Comprehensive Dissertation Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Dissertations, Academic categories.
Selective Hydrogenation Of Alpha Beta Unsaturated Aldehydes Towards Clean Synthesis Over Noble Metal Catalysts In Mass Transfer Efficient Three Phase Reactors
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Author : Laiqi Zhang
language : en
Publisher:
Release Date : 1998
Selective Hydrogenation Of Alpha Beta Unsaturated Aldehydes Towards Clean Synthesis Over Noble Metal Catalysts In Mass Transfer Efficient Three Phase Reactors written by Laiqi Zhang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
The hydrodynamics and mass transfer characteristics of a concurrent downflow contactor (CDC) are studied in this work in order to investigate the viability of this bubble column as a catalytic reactor for the hydrogenation of ?,?-unsaturated aldehydes. Oxygen/water was used as the system throughout. In order to obtain reproducible results, a very effective gas-liquid separation method was conceived and developed after much trial and error work. Shutdown and deadleg gas holdup measuring methods were compared and it was found that the shutdown method is more reliable than the deadleg method. The hydrogenation of cinnamaldehyde using both in-house-prepared and commercial palladium, platinum and ruthenium catalysts was carried out in stirred tank reactors and cocurrent downflow reactors in order to study the kinetics and mass transfer characteristics and the selectivity towards the corresponding desired product, hydrocinnamaldehyde or cinnamyl alcohol. When palladium catalysts were used the desired product was hydrocinnamaldehyde. The effects of homogenous reactions, type of solvent, catalyst loading, temperature, pressure, reactant concentration and the effects of promoter or poison on the selectivity towards hydrocinnamaldehyde were investigated systematically. Aldehyde acetals were produced in polar solvents, but not in non-polar solvents. Two methods can be used to obtain hydrocinnamaldehyde selectivity without reduction of the carbonyl double bond: (1) by using non-polar solvents such as toluene; (2) by incorporating poisons or promoters into the reactant solution or onto the surface of the catalysts. 97% selectivity to hydrocinnamaldehyde was achieved. The effects of the solvent, temperature, pressure, catalyst loading, promoters, and reactants concentration on the kinetics were studied and the following reaction kinetics are proposed for the hydrogenation of cinnamaldehyde over non-modified palladium/charcoal catalysts in propan-2-ol and in toluene: Ra = kC\(-{Cat}\)C\(-{H2}\)C\( 0-{CAL}\) The apparent activation energy varies with themperature range in propan-2-ol and is 65\(\pm\)5 kJ.mol\( {-1}\) in toluene.
Chemical Engineering Progress
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Author :
language : en
Publisher:
Release Date : 1971
Chemical Engineering Progress written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Chemistry, Technical categories.
Mass Transfer In Heterogeneous Catalysis
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Author : Charles N. Satterfield
language : en
Publisher: MIT Press (MA)
Release Date : 1970
Mass Transfer In Heterogeneous Catalysis written by Charles N. Satterfield and has been published by MIT Press (MA) this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Science categories.
Directory Of Graduate Research
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Author : American Chemical Society. Committee on Professional Training
language : en
Publisher:
Release Date : 1971
Directory Of Graduate Research written by American Chemical Society. Committee on Professional Training and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Biochemistry categories.
Faculties, publications and doctoral theses in departments or divisions of chemistry, chemical engineering, biochemistry and pharmaceutical and/or medicinal chemistry at universities in the United States and Canada.
4 I E Cuarto Congreso Nacional Y 1 I E Primer Latinoamericano De Petroqu Mica Realizado En San Carlos De Bariloche Argentina 14 Al 20 De Noviembre De 1976 Estado Actual De La Petroqu Mica Y Sectores Industriales
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Author :
language : es
Publisher:
Release Date : 1976
4 I E Cuarto Congreso Nacional Y 1 I E Primer Latinoamericano De Petroqu Mica Realizado En San Carlos De Bariloche Argentina 14 Al 20 De Noviembre De 1976 Estado Actual De La Petroqu Mica Y Sectores Industriales written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Petroleum chemicals industry categories.
Catalytic And Process Study Of The Selective Hydrogenation Of Acetylene And 1 3 Butadiene
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Author : Ruijun Hou
language : en
Publisher: Springer
Release Date : 2017-01-05
Catalytic And Process Study Of The Selective Hydrogenation Of Acetylene And 1 3 Butadiene written by Ruijun Hou and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-05 with Science categories.
This thesis offers novel methods for catalyst and process design for the selective hydrogenation of acetylene and 1,3-butadiene. The author predicts the properties of supported Pd–Ni bimetallic catalysts using density functional theory (DFT) calculations and temperature-programmed desorption (TPD). The excellent correlation between model surfaces and supported catalysts demonstrates the feasibility of designing effective bimetallic catalysts for selective hydrogenation reactions. The author also proposes a method for designing non-precious metal catalysts to replace precious metals. She modifies the process of selective hydrogenation of acetylene by coupling the selective adsorption to the selective hydrogenation in the liquid phase, as a result of which the ethylene selectivity is greatly improved and heat transfer is greatly enhanced. Lastly, by analyzing the mechanism of liquid-phase hydrogenation, the author proposes a multi-stage slurry bed reactor for industrial applications.“/p>