Journal
CATALYSIS TODAY
Volume 74, Issue 3-4, Pages 225-234Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0920-5861(02)00025-1
Keywords
ceria; zirconia; oxygen storage capacity; molecular structure; XAFS
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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.
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