【求助】（已应助）文献两篇－1993年的

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doi:10.1016/0304-5102(93)80103-2
Copyright © 1993 Published by Elsevier Science B. V. All rights reserved.
Liquid phase hydrogenation of cinnamaldehyde over supported ruthenium catalysts: Influence of particle size, bimetallics and nature of support

B. Coq, P. S. Kumbhar, C. Moreau, P. Moreau and M. G. Warawdekar
Laboratoire de Chimie Organique Physique et Cinétique Chimique Appliquées, URA 418 CNRS, ENSCM, 8 rue de l'Ecole Normale, 34053 Montpellier Cedex 01 France; (+33)67144353
Received 16 April 1993; accepted 27 July 1993. Available online 17 September 2001.

Abstract

Hydrogenation of cinnamaldehyde was studied over supported Ru based catalysts. The influence of particle size, bimetallic formulation and nature of support on activity and selectivity to the desired product, cinnamyl alcohol, was investigated. Ru particle size had a pronounced effect on both TOF and selectivity. Larger Ru particles showed higher selectivity to cinnamyl alcohol, as well as higher TOF. Addition of Sn, Fe, Ge, Sb, Zn and Ag as a second metal improved both activity and selectivity. Ru---Sn/Al2O3 showed sustained improvement in selectivity, even at higher conversions, probably due to the presence of Ru---Snδ+ sites and/or due to the electron transfer from Sn to Ru. ZrO2 was found to be the most effective support in terms of selectivity. Possible reasons for this behaviour of ZrO2 are delineated.

Author Keywords: bimetallic catalysts; cinnamaldehyde; hydrogenation; selectivity

doi:10.1016/0304-5102(93)85041-Q
Copyright © 1993 Published by Elsevier Science B. V. All rights reserved.
Selective hydrogenation of cinnamaldehyde over Ru—Sn catalysts

S. Galvagno

A. Donato, G. Neri and R. Pietropaolo

G. Capannelli
Università di Messina, Dipartimento di Chimica Industriale, Cas. Post. 29, I-98166 Sant'Agata di Messina Italy
Università di Reggio Calabria, Facoltà di Ingegneria, Via Cuzzocrea 48, I-89100 Reggio Calabria Italy
Università di Genova, Dipartimento di Chimica Industriale, Corso Europa 30, Genoa Italy
Received 12 March 1992; accepted 26 May 1992. Available online 14 September 2001.

Abstract

Hydrogenation of cinnamaldehyde has been investigated over a series of Ru—Sn/C catalysts having various Sn/Ru ratios. Addition of tin to Ru/C decreases the CO chemisorption capability of the catalyst. The overall turnover frequency of cinnamaldehyde disappearance and the selectivity to cinnamyl alcohol increase with the Sn/Ru ratio. It is suggested that hydrogenation of the ---C=O group occurs on sites associated with tin ions. On these sites the carbonyl group is polarized, facilitating hydrogen transfer from an adjacent Ru---H site.

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