The thermal stability and catalytic performance of Ce-Zr promoted Rh-Pd/γ-Al2O3 automotive catalysts

被引：104

作者：

Wu, XD ^{[1
]}

Xu, LH ^{[1
]}

Weng, D ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Mat Sci & Engn, Beijing 100084, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2004年 / 221卷 / 1-4期

基金：

中国国家自然科学基金;

关键词：

TWC; Ce-Zr mixed oxides; accelerated aging; surface characterization; light-off temperature; lambda-window;

D O I：

10.1016/S0169-4332(03)00938-3

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：

The noble metals (Rh, Pd) supported on alumina promoted with Ce-Zr mixed oxides were investigated as catalysts under diverse oxidants/reductants ratios of simulated automotive exhaust feed gas. Aging test was performed in air at 1000 degreesC for 20 h. Both fresh and aged catalysts, as well as alumina-supported Ce-Zr mixed powders, were characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET) and X-ray photoelectron spectroscopy (XPS). The results confirmed the oxygen storage capacity of Ce-Zr mixed oxides favored CO, C3H8 and NO conversions in stationary versus dynamic stoichiometric operation. The accelerated aging of the systems produced inconspicuous effect on the phase structure, specific surface area and chemical state of these samples. Accordingly, the aged samples still showed low light-off temperature and broad lambda-window, which suggested the relative low relevance of the thermal degradation on the overall catalytic performance of the system. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：375 / 383

页数：9

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