Influence of substrate structure on activity of alumina supported Pd particles: CO adsorption and oxidation

被引：36

作者：

Stara, I

Nehasil, V

Matolin, V

机构：

[1] Dept. Electronics and Vacuum Phys., Charles University, 180 00 Prague 8

来源：

SURFACE SCIENCE | 1996年 / 365卷 / 01期

关键词：

aluminium oxide; carbon monoxide; clusters; oxidation; palladium; surface chemical reaction; surface diffusion; thermal desorption spectroscopy;

D O I：

10.1016/0039-6028(96)00689-9

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：

Recently the unexpected effects of partial CO dissociation were reported for small Pd particles deposited on gamma-alumina, prepared by thermal oxidation of aluminium whilst this behaviour was not observed on Pd/alpha-alumina model catalysts. In this study we compared the CO adsorption and oxidation properties of Pd particles deposited on cc-alumina substrates of different surface stoichiometry with those of Pd on gamma-alumina. It was shown that the oxygen adsorption capacity as well as the reactivity of ct-alumina supported catalysts was lower than those of gamma-alumina supported catalysts. The CO and oxygen sticking probability measurements indicated the CO and O diffusion over the support that in the case of CO decreased with T. The temperature dependent CO oxidation rate was explained in terms of its limitation by the CO diffusion process which is less important in the case of the aluminium rich alumina surface.

引用

页码：69 / 77

页数：9

共 29 条

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