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

被引：119

作者：

Bus, Eveline ^{[1
]}

Prins, Roel ^{[1
]}

van Bokhoven, Jeroen A. ^{[1
]}

机构：

[1] ETH, Dept Chem & Appl Biosci, Inst Chem & Bioengn, Zurich, Switzerland

来源：

CATALYSIS COMMUNICATIONS | 2007年 / 8卷 / 09期

关键词：

supported gold catalyst; selective hydrogenation; cinnamaldehyde; cyclohexene; gold cluster size;

D O I：

10.1016/j.catcom.2006.11.040

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Gold nanoclusters supported on gamma-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 C=O hydrogenation rate on cluster size compared to the C=C hydrogenation rate. Small clusters exhibit an enhanced pi backbonding, which favors C=O adsorption over C=C adsorption. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：1397 / 1402

页数：6

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