Selective Hydrogenation of [alpha]-[beta] Unsaturated Aldehydes Over Ir Catalysts PDF Download
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![Selective Hydrogenation of [alpha]-[beta] Unsaturated Aldehydes Over Ir Catalysts PDF](https://books.google.com/books/content/images/frontcover/6CSG0AEACAAJ?fife=w150-h200)
Author: J. Gomez-Lopez
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Category :
Languages : en
Pages : 0
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![Selective Hydrogenation of [alpha]-[beta] Unsaturated Aldehydes Over Ir Catalysts PDF](https://books.google.com/books/content/images/frontcover/6CSG0AEACAAJ?fife=w80-h100)
Author: J. Gomez-Lopez
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ISBN:
Category :
Languages : en
Pages : 0
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![Selective Hydrogenation of [alpha],[beta]-unsaturated Aldehydes Over Metal Catalysts PDF](https://books.google.com/books/content/images/frontcover/55sUMwEACAAJ?fife=w80-h100)
Author: Thomas Balder Ludwig Wolfgang Marinelli
Publisher:
ISBN: 9789090067216
Category :
Languages : en
Pages : 129
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![Selective Hydrogenation of [alpha], [beta][alpha, Beta]-unsaturated Aldehydes Towards Clean Synthesis Over Noble Metal Catalysts in Mass Transfer Efficient Three Phase Reactors PDF](https://books.google.com/books/content/images/frontcover/SkZ4nQAACAAJ?fife=w80-h100)
Author: Laiqi Zhang
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Languages : en
Pages :
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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.
![Selective Hydrogenation of [alpha]-[beta] Unsaturated Aldehydes Over Ir Catalysts PDF](https://books.google.com/books/content/images/frontcover/3qlyGwAACAAJ?fife=w80-h100)
Author: J. Gomez-Lopez
Publisher:
ISBN:
Category :
Languages : en
Pages :
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![Selective Hydrogenation of Α,β[alpha,beta]-unsaturated Aldehydes Towards Clean Synthesis Over Noble Metal Catalysts in Mass Transfer Efficient Three Phase Reactors PDF](https://books.google.com/books/content/images/frontcover/ukTlvgEACAAJ?fife=w80-h100)
Author: Laiqi Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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.
![Adsorption and Selective Hydrogenation of [alpha, Beta]-unsaturated Aldehydes on Pt(111) and Pt-Sn Model Catalysts PDF](https://books.google.com/books/content/images/frontcover/urR2PgAACAAJ?fife=w80-h100)
Author: Jan Haubrich
Publisher:
ISBN:
Category :
Languages : en
Pages : 266
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![Selective Hydrogenation of [Alpha], [Beta]-unsaturated Aldehydes Towards Clean Synthesis Over Noble Metal Catalysts in Mass Transfer Efficient Three Phase Reactors PDF](https://books.google.com/books/content/images/frontcover/UGr-sgEACAAJ?fife=w80-h100)
Author: Lai Qi Zhang
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ISBN:
Category :
Languages : en
Pages :
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![Selective Hydrogenation of [alpha-beta] Unsaturated Alhehydes Over Ir Catalystsdulation of EGFR Signalling Pathways Using Synthetic Peptides PDF](https://books.google.com/books/content/images/frontcover/hKK0zQEACAAJ?fife=w80-h100)
Author: Javier Gomez-Lopez
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Category :
Languages : en
Pages :
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![Selective Hyddrogenation of [alpha],[beta]-unsaturated Aldehydes Over Metal Catalysts PDF](https://books.google.com/books/content/images/frontcover/vtDzPgAACAAJ?fife=w80-h100)
Author: Thomas Balder Ludwig Wolfgang Marinelli
Publisher:
ISBN:
Category :
Languages : en
Pages : 129
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Author: M. Guisnet
Publisher: Elsevier
ISBN: 0080887090
Category : Science
Languages : en
Pages : 627
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Book Description
The recession in the traditional heavy industries along with the development of advanced technologies in all the industrial countries has meant that the impact of heterogeneous catalysis in the synthesis of fine chemicals is becoming increasingly noticeable. The second International Symposium on Heterogeneous Catalysis and Fine Chemicals is to be seen in this perspective. Organised by the Laboratory of Catalysis in Organic Chemistry of the University of Poitiers within the framework of the International Symposia of the `Centre National de la Recherche Scientifique' (CNRS), the symposium provided an opportunity for contact between academic researchers and manufacturers, users (or potential users) of solid catalysts for fine chemical synthesis. The book gives an overall view of the problems encountered by academic and industrial researchers. A large variety of reactions are described, the emphasis being on selectivity: chemo-, regio-, stereoselectivity (even enantioselectivity) and on the change of these selectivities as a function of the characteristics of the surface sites (nature, distribution, etc.).The three themes of the symposium, hydrogenation, oxidation and acid-base catalysis were introduced in four plenary lectures and two invited communications, maintaining a balance between the industrial and the academic points of view. Some 60 research papers selected by the Scientific Committee were presented. All are reproduced in full in this proceedings volume.
