Chemical Removal of CeO2 Segregated on the Surface of CeO2-ZrO2 Binary Oxides for Improvement of OSC

被引：1
|
作者：
Kakuta, Noriyoshi [1 ]
Sugino, Youko [1 ]
Rachi, Hironobu [1 ]
Ohkita, Hironobu [1 ]
Mizushima, Takanori [1 ]
机构：
[1] Toyohashi Univ Technol, Dept Mat Sci, Tempaku Ku, Toyohashi, Aichi 4418580, Japan
来源：
TOPICS IN CATALYSIS | 2009年 / 52卷 / 13-20期
关键词：
CeO2; HNO3/H2O2; treatment; OSC; CeO2-ZrO2; OXYGEN STORAGE CAPACITY; MIXED OXIDES; CATALYSTS; BEHAVIOR; MICROSTRUCTURE; PERFORMANCE; OXIDATION; SR;
D O I：
10.1007/s11244-009-9368-0
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
A chemical treatment to remove residual CeO2 phase on CeO2-ZrO2 (CZ) solid solution was carried out. A CZ was treated by H2O2 for the reduction of Ce4+ to Ce3+ and then HNO3 for the dissolution of Ce3+ compounds (H-CZ). H-2-TPR, TEM-EDX and XPS analyses revealed the removal of CeO2 phase and the homogeneous distribution of Ce species. About 20% improvement in oxygen storage capacity (OSC) of H-CZ was confirmed at 773 K by the weight measurements under H-2/N-2 and air atmospheres, indicating that the HNO3/H2O2 treatment was effective to avoid the deterioration of the OSC by segregated CeO2 on the CZ binary oxides.
引用
收藏
页码：1888 / 1892
页数：5
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