In situ XAS studies on the structure of the active site of supported gold catalysts

被引：0

作者：

Weiher, Norbert ^{[1
]}

Beesley, Angela M. ^{[1
]}

Tsapatsaris, Nikolaos ^{[1
]}

Louis, Catherine ^{[2
]}

Delannoy, Laurent ^{[2
,3
]}

van Bokhoven, Jeroen A. ^{[1
,4
]}

机构：

[1] Sch Chem Engn & Analyt Sci, Mol Mat Ctr, Sackville St,POB 88, Manchester M60 1QD, Lancs, England

[2] Univ Paris 06, CNRS, UMR 7609, Lab Reactivite Surface, F-75252 Paris 05, France

[3] ETH, Inst Chem & Bioengn, CH-8093 Zurich, Switzerland

[4] Mol Mat Ctr, Sch Chem, Manchester M60 1QD, Lancs, England

来源：

X-RAY ABSORPTION FINE STRUCTURE-XAFS13 | 2007年 / 882卷

关键词：

x-ray absorption spectroscopy; catalysis; gold; alumina; titania; CO oxidation;

D O I：

暂无

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Gold clusters supported on Al2O3 and TiO2 have been exposed to different mixtures of CO and O-2. Their structure has been probed in situ using X-ray absorption spectroscopy (XAS) at the An L-3-edge. In all materials, the dominant phase during catalysis is Au-0. Both samples show variations of the electronic structure of the gold clusters with changing reaction conditions as evidenced by changes in the X-ray absorption near-edge (XANES) region. These variations are caused by interaction between the gold clusters and the carbon monoxide present in the gas phase. The gold atoms remain zerovalent throughout all experiments confirming the importance of Au-0 for catalytic activity.

引用

页码：600 / +

页数：2

共 27 条

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