Oxidation behavior of reduced (CeO2)1-x-(ZrO2)x (x=0, 0.2, 0.5) catalysts

被引：24

作者：

Kakuta, N ^{[1
]}

Ikawa, S ^{[1
]}

Eguchi, T ^{[1
]}

Murakami, K ^{[1
]}

Ohkita, H ^{[1
]}

Mizushima, T ^{[1
]}

机构：

[1] Toyohashi Univ Technol, Dept Mat Sci, Toyohashi, Aichi 4418580, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2006年 / 408卷

关键词：

cerium oxide; zirconium oxide; oxygen storage; temperature programmed reduction (TPR);

D O I：

10.1016/j.jallcom.2004.12.134

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：

Oxidation properties of CeO2-ZrO2 catalysts were investigated as a function of oxidation temperature by a combination of TPR and O-2, pulse injection methods. Ce3+ species formed from the CeO2 phase in the CeO2-ZrO2(5/1) catalyst and CeO2 were very sensitive to oxygen and the amount of oxygen stored was reproducible by the oxidation at temperatures as low as 373 K. However, Ce3+ species formed in the solid solution of the CeO2-ZrO2(1/1) catalyst were relatively stable. The formation of solid solution facilitated the reducibility of Ce4+ species at low temperature. It was speculated from the titration profile that there were a few steps to oxidize Ce3+ species distributed from surface to bulk in the CeO2-ZrO2 (1/1) catalyst. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：1078 / 1083

页数：6

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