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

被引：295

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

共 27 条

[1] Computer simulation studies of bulk reduction and oxygen migration in CeO2-ZrO2 solid solutions [J].

Balducci, G ;

Kaspar, J ;

Fornasiero, P ;

Graziani, M ;

Islam, MS ;

Gale, JD .

JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (10) :1750-1753

[2] Modification of the redox behaviour of CeO2 induced by structural doping with ZrO2 [J].

Fornasiero, P ;

Balducci, G ;

DiMonte, R ;

Kaspar, J ;

Sergo, V ;

Gubitosa, G ;

Ferrero, A ;

Graziani, M .

JOURNAL OF CATALYSIS, 1996, 164 (01) :173-183

[3] RH-LOADED CEO2-ZRO2 SOLID-SOLUTIONS AS HIGHLY EFFICIENT OXYGEN EXCHANGERS - DEPENDENCE OF THE REDUCTION BEHAVIOR AND THE OXYGEN STORAGE CAPACITY ON THE STRUCTURAL-PROPERTIES [J].

FORNASIERO, P ;

DIMONTE, R ;

RAO, GR ;

KASPAR, J ;

MERIANI, S ;

TROVARELLI, A ;

GRAZIANI, M .

JOURNAL OF CATALYSIS, 1995, 151 (01) :168-177

[4] INFRARED AND RAMAN-SPECTROSCOPIC STUDIES OF ZRO2 POLYMORPHS DOPED WITH Y2O3 OR CEO2 [J].

HIRATA, T ;

ASARI, E ;

KITAJIMA, M .

JOURNAL OF SOLID STATE CHEMISTRY, 1994, 110 (02) :201-207

[5] Crystal structure of metastable K-CeZrO4 phase possessing an ordered arrangement of Ce and Zr ions [J].

Kishimoto, H ;

Omata, T ;

Otsuka-Yao-Matsuo, S ;

Ueda, K ;

Hosono, H ;

Kawazoe, H .

JOURNAL OF ALLOYS AND COMPOUNDS, 2000, 312 (1-2) :94-103

[6] Understanding of enhanced oxygen storage capacity in Ce0.5Zr0.5O2:: The presence of an anharmonic pair distribution function in the Zr-O2 subshell as analyzed by XAFS spectroscopy [J].

Lemaux, S ;

Bensaddik, A ;

van der Eerden, AMJ ;

Bitter, JH ;

Koningsberger, DC .

JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (21) :4810-4815

[7] X-RAY-ABSORPTION STUDIES OF ZIRCONIA POLYMORPHS .2. EFFECT OF Y2O3 DOPANT ON ZRO2 STRUCTURE [J].

LI, P ;

CHEN, IW ;

PENNERHAHN, JE .

PHYSICAL REVIEW B, 1993, 48 (14) :10074-10081

[8] EFFECT OF DOPANTS ON ZIRCONIA STABILIZATION - AN X-RAY-ABSORPTION STUDY .2. TETRAVALENT DOPANTS [J].

LI, P ;

CHEN, IW .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1994, 77 (05) :1281-1288

[9] X-RAY-ABSORPTION STUDIES OF ZIRCONIA POLYMORPHS .1. CHARACTERISTIC LOCAL STRUCTURES [J].

LI, P ;

CHEN, IW ;

PENNERHAHN, JE .

PHYSICAL REVIEW B, 1993, 48 (14) :10063-10073

[10] Oxygen mobility in CeO2 and CexZr(1-x)O2 compounds:: Study by CO transient oxidation and 18O/16O isotopic exchange [J].

Madier, Y ;

Descorme, C ;

Le Govic, AM ;

Duprez, D .

JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (50) :10999-11006

← 1 2 3 →