Phase evolution and reduction behavior of Ce0.6Zr0.4O2 powders prepared using the chemical co-precipitation method

被引：9
|
作者：
Chuang, Chia-Che [1 ]
Hsiang, Hsing-I [1 ]
Yen, Fu-Su [1 ]
Chen, Chih-Cheng [2 ]
Yang, Shien-Jen [3 ]
机构：
[1] Natl Cheng Kung Univ, Dept Resources Engn, Particulate Mat Res Ctr, Tainan 70101, Taiwan
[2] Far E Univ, Dept Mech Engn, Tainan 744, Taiwan
[3] Far E Univ, Dept Mat Sci & Engn, Tainan 744, Taiwan
来源：
CERAMICS INTERNATIONAL | 2013年 / 39卷 / 02期
关键词：
Cold-start emission; Oxygen storage capacity; Phase separation; Pyrochlore; OXYGEN RELEASE BEHAVIOR; AUTOMOTIVE EXHAUST CATALYSTS; CEO2-ZRO2 MIXED OXIDES; STORAGE CAPACITY; REDOX BEHAVIOR; SUCCESSIVE OXIDATION; CERIA-ZIRCONIA; CEO2; APPEARANCE; STABILITY;
D O I：
10.1016/j.ceramint.2012.08.016
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The relationship between the crystalline structure and reduction behavior of Ce0.6Zr0.4O2 (C60Z) synthesized using the chemical co-precipitation method is investigated. C60Z decomposes into Ce-rich and Zr-rich phases after calcination at above 1100 degrees C for 2 h. The phase separation deteriorates the reducibility and oxygen storage capacity, indicating that reduction behavior is degraded by chemical inhomogeneity due to phase separation. The two separated phases transform into pyrochlore after heat treatment at 1490 degrees C under a 5% CO/N-2 atmosphere and then transform back into the separated phases after subsequent heat treatment in air. These results suggest that the structural change under reduction/re-oxidation treatment may result from cation diffusion. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码：1717 / 1722
页数：6
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