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Origin of the cluster-size effect in the hydrogenation of cinnamaldehyde over supported Au catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
52435 46874 2007 6 PDF Available
Title
Origin of the cluster-size effect in the hydrogenation of cinnamaldehyde over supported Au catalysts
Abstract

Gold nanoclusters supported on γ-Al2O3 were more active and selective than platinum nanoclusters in the high-pressure liquid-phase hydrogenation of cinnamaldehyde to cinnamylalcohol, while in the hydrogenation of cyclohexene gold was less active than platinum. The differences in catalytic performance are ascribed to the weaker interaction of gold with the reactants and products compared to platinum. Gold clusters with a diameter below 2 nm are essential to obtain a high activity and selectivity in the hydrogenation of cinnamaldehyde. The size dependence of the selectivity originates from the stronger dependence of the CO hydrogenation rate on cluster size compared to the CC hydrogenation rate. Small clusters exhibit an enhanced π backbonding, which favors CO adsorption over CC adsorption.

Keywords
Supported gold catalyst; Selective hydrogenation; Cinnamaldehyde; Cyclohexene; Gold cluster size
First Page Preview
Origin of the cluster-size effect in the hydrogenation of cinnamaldehyde over supported Au catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 8, Issue 9, September 2007, Pages 1397–1402
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis