Selective Modification of the Acid-Base Properties of Ceria by Supported Au

被引：27

作者：

Bezen, Manuela C. I. ^{[1
]}

Breitkopf, Cornelia ^{[1
]}

El Kolli, Nadia ^{[2
]}

Krafft, Jean-Marc ^{[2
]}

Louis, Catherine ^{[2
]}

Lercher, Johannes A. ^{[1
]}

机构：

[1] Tech Univ Munich, Dept Chem, D-85748 Garching, Germany

[2] Univ Paris 06, UPMC, CNRS, Lab Reactivite Surface,UMR 7197, F-75252 Paris 05, France

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2011年 / 17卷 / 25期

关键词：

cerium; gold; heterogeneous catalysis; IR spectroscopy; supported catalysts; TRANSFORM INFRARED-SPECTROSCOPY; PREFERENTIAL CO OXIDATION; WATER-GAS-SHIFT; CARBON-MONOXIDE; SURFACE-REACTIONS; OXIDE SURFACES; GOLD CATALYSTS; ADSORPTION; REDUCTION; MECHANISM;

D O I：

10.1002/chem.201002011

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Au supported on CeO2 prepared by deposition-precipitation with urea leads to a basic catalyst. Au acts in two ways as surface modifier. First, Au selectively interacts with Ce4+ cations by either blocking access to or reducing Ce4+ to Ce3+. Second, the resulting Au atoms (presumably as Au+ ions) act as soft, weak Lewis acid sites stabilizing carbanion intermediates and enhancing hydride abstraction in the dehydrogenation of alcohols. In consequence, the thus-synthesized basic catalyst catalyzes the dehydrogenation of propan-2-ol to acetone with high efficiency and without notable deactivation. Additionally, the dehydration pathway of propan-2-ol is eliminated, as Au also quantitatively blocks access to strongly acidic Ce4+ ions or reduces them to Ce3+.

引用

页码：7095 / 7104

页数：10

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