X-ray absorption fine structure analysis of local structure of CeO2-ZrO2 mixed oxides with the same composition ratio (Ce/Zr=1)

被引：291

作者：

Nagai, Y ^{[1
]}

Yamamoto, T

Tanaka, T

Yoshida, S

Nonaka, T

Okamoto, T

Suda, A

Sugiura, M

机构：

[1] Toyota Cent Res & Dev Labs Inc, Nagakute, Aichi 4801192, Japan

[2] Kyoto Univ, Dept Mol Engn, Kyoto 6068501, Japan

来源：

CATALYSIS TODAY | 2002年 / 74卷 / 3-4期

关键词：

ceria; zirconia; oxygen storage capacity; molecular structure; XAFS;

D O I：

10.1016/S0920-5861(02)00025-1

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Three types of CeO2-ZrO2 (Ce:Zr = 1:1 molar ratio) compounds with different oxygen storage/release capacities (OSCs) were characterized by means of the Ce K-edge and Zr K-edge X-ray absorption fine structure (XAFS). In order to investigate the relationship between the OSC and local structure, the quantitative EXAFS curve-fitting analysis was applied. By enhancing the homogeneity of the Ce and Zr atoms in the CeO2-ZrO2 solid solution, the OSC performance increased. Especially, the atomically homogeneous Ce0.5Zr0.5O2 solid solution exhibited the highest OSC among these Ceo(2)-ZrO2 samples. Additionally, the local oxygen environment around Ce and Zr was remarkably modified by enhancing the homogeneity of the CeO2-ZrO2 solid solution. It was postulated that the enhancement of the homogeneity of the CeO2-ZrO2 solid solution and the modification of the oxygen environment would be the source for the OSC improvement. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：225 / 234

页数：10

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