First stage of thermal aging under oxidizing conditions of a Ce0.62Zr0.38O2 mixed oxide with an ordered cationic sublattice:: A chemical, nanostructural, and nanoanalytical study

被引：34

作者：

Yeste, Maria P. ^{[1
]}

Hernandez, Juan C. ^{[1
]}

Trasobares, Susana ^{[1
]}

Bernal, Serafin ^{[1
]}

Blanco, Ginesa ^{[1
]}

Calvino, Jose J. ^{[1
]}

Perez-Omil, Jose A. ^{[1
]}

Pintado, Jose M. ^{[1
]}

机构：

[1] Univ Cadiz, Dept Ciencia Mat & Ingn Met & Quim Inorgan, Fac Ciencias, E-11510 Puerto Real, Cadiz, Spain

来源：

CHEMISTRY OF MATERIALS | 2008年 / 20卷 / 15期

关键词：

D O I：

10.1021/cm800928p

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：

After being heated in a flow of 5% O-2/He, at 1073 or 1123 K for 30 min, a Ce0.62Zr0.38O2 sample showing an ordered cationic sublattice had very subtle surface nanostructural changes induced on it. In parallel with them, a significant loss of low-temperature (T <= 773 K) oxygen storage capacity (OSC), with no modification of its high-temperature (T >= 973 K) redox response, was observed. These nanostructural and chemical features characterize the very first stage of the process leading to the destruction of the ordered Ce-Zr sublattice, a structural phenomenon playing a key role in the control of redox behavior of ceria-zirconia mixed oxides. The reported results, including OSC, hydrogen chemisorption, and nanostructural and nanoanalytical data, lend further support to a model providing a comprehensive interpretation of the complex relationship linking thermal aging conditions, nanostructural properties, surface chemistry, and redox behavior in these materials.

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页码：5107 / 5113

页数：7

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