Effect of Ce-Zr mixed oxides on the thermal stability of transition aluminas at elevated temperature

被引：48

作者：

Wu, XD ^{[1
]}

Yang, B ^{[1
]}

Weng, D ^{[1
]}

机构：

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

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2004年 / 376卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

alumina; Ce-Zr mixed oxides; thermal stabilization; surface area;

D O I：

10.1016/j.jallcom.2003.12.046

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：

Ce-Zr mixed oxides is a kind of promoted oxygen storage capability material widely used in three-way catalysts. Various contents (10, 20, 30 and 40%) of Ce-Zr were physically mixed into the pure gamma-alumina for surface modification. The thermal stability of a series of Ce-Zr/Al2O3 supports was examined. Differential thermal analysis shows Ce-Zr mixed oxides increase the alpha-alumina transformation temperature up to 1222degreesC. The powder X-ray diffraction studies show that minor theta-alumina phase still exists in the samples with greater than or equal to 20% Ce-Zr doping content after aging at 1050degreesC for 50 h. The best stabilizing effect is observed in the case of 20% Ce-Zr/Al2O3. Even after the accelerated aging test, it maintains an acceptable specific surface area (24 m(2) g(-1)) in relation with the delayed transformation of theta into alpha-alumina. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：241 / 245

页数：5

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