A model of oxygen transport in Pt/ceria catalysts from isotope exchange

被引：69

作者：

Holmgren, A

Duprez, D

Andersson, B ^{[1
]}

机构：

[1] Chalmers Univ Technol, Dept Chem React Engn, SE-41296 Gothenburg, Sweden

[2] Chim Organ Lab, F-86022 Poitiers, France

来源：

JOURNAL OF CATALYSIS | 1999年 / 182卷 / 02期

关键词：

ceria; platinum; oxygen transport; oxygen exchange; mathematical modeling;

D O I：

10.1006/jcat.1998.2334

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：

From isotope oxygen exchange reactions and simulations of these experiments, the important steps in oxygen transport in Pt/ceria were distinguished and their rates were estimated. A Pt/alumina sample was also experimentally investigated for comparison, Oxygen surface diffusion as well as oxygen spillover from Pt to ceria was found to be fast in comparison with adsorption/desorption of oxygen on the metal and oxygen bulk diffusion. The exchange rate was found to be higher on a very-low-Pt-dispersion sample than on a high-dispersion sample, which in the model was explained by the different adsorption properties of oxygen. (C) 1999 Academic Press.

引用

页码：441 / 448

页数：8

共 41 条

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