Interaction of CO with Rh supported on stoichiometric and reduced CeO2(111) and CeO2(100) surfaces

被引：101

作者：

Stubenrauch, J ^{[1
]}

Vohs, JM ^{[1
]}

机构：

[1] UNIV PENN,RES STRUCT MATTER LAB,PHILADELPHIA,PA 19104

来源：

JOURNAL OF CATALYSIS | 1996年 / 159卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1006/jcat.1996.0063

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：

The structure and reactivity of Rh films supported on the surface of a CeO2 single crystal were studied using Auger electron spectroscopy (AES) and temperature-programmed desorption (TPD). Rhodium films deposited from the vapor phase were found to grow via the nucleation of three-dimensional particles at a sample temperature of 300 K. Annealing of the Rh films resulted in further agglomeration of the metal layer. Carbon monoxide TPD spectra obtained from Rh supported on oxygen-annealed CeO2(111) and CeO2(100) substrates were similar to those obtained from the low-index planes of Rh single crystals, with the exception that a small fraction of the CO (ca. 2%) was oxidized to CO2. In contrast, a new high-temperature CO desorption state was observed in the TPD spectra obtained from Rh supported on partially reduced CeO2 surfaces. (C) 1996 Academic Press, Inc.

引用

页码：50 / 57

页数：8

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