Study of CO adsorption on crystalline-silica-supported palladium particles

被引：101

作者：

Giorgi, JB ^{[1
]}

Schroeder, T ^{[1
]}

Bäumer, M ^{[1
]}

Freund, HJ ^{[1
]}

机构：

[1] Max Planck Gesell, Fritz Haber Inst, Dept Chem Phys, D-14195 Berlin, Germany

来源：

SURFACE SCIENCE | 2002年 / 498卷 / 1-2期

基金：

加拿大自然科学与工程研究理事会;

关键词：

palladium; carbon monoxide; silicon oxides; adatoms; clusters; vibrations of adsorbed molecules; infrared absorption spectroscopy; scanning tunneling microscopy;

D O I：

10.1016/S0039-6028(01)01756-3

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：

Supported palladium particles have been studied using a recently developed crystalline silica film. The SiO2 film, as seen for the first time by scanning tunnelling microscopy (STM), is sufficiently flat to be used for model catalyst studies. Palladium particles grown on silica at room temperature are round and somewhat disordered as seen by STM, suggesting a strong interaction between the Pd particles and the silica support, The structural properties of the palladium particles were probed by CO adsorption at 90 K. and monitored by IRAS. The same general adsorption sites are observed for the Pd particles grown on silica as have previously been observed for crystalline Pd particles on alumina, however a larger fraction of on-top sites was observed on silica, indicative of the smaller and more disordered particles. These first results obtained for the Pd/SiO2/Mo(112) system are encouraging for the use of the crystalline SiO2 substrate as a model-catalyst support. (C) 2001 Published by Elsevier Science B.V.

引用

页码：L71 / L77

页数：7

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