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Local structure analysis of oxygen storage promoters, CeO2-ZrO2

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In this solution, EXAFS method at Ce and Zr K-edges was applied to study local structure of CeO2-ZrO2 mixed oxide, oxygen storage promoters in automotive catalysts. The EXAFS method is a powerful technique to study local structure (distance, coordination number, species of neighbor atoms) of selected elements both in crystalline states and in non-crystalline states. Figure 1 shows radial structure function of Te atom after Fourier transform of Ce K-edge EXAFS spectra. Simultaneous analysis of EXAFS data set at 2 absorption edges revealed that homogeneous CeO2-ZrO2 solid solution (Fig. 2(c)) has high oxygen storage capacity.

Fig. 1 Radial structure function for Ce atom in CeO2-ZrO2 samples prepared by different methodologies.

Fig.2 Model structures of samples in Fig. 1.

[ Y. Nagai, T. Yamamoto, T. Tanaka, S. Yoshida, T. Nonaka, T. Okamoto, A. Suda and M. Sugiura, Journal of Synchrotron Radiation 8, 616-618 (2001), Fig. 3, 4, 6,
©2001 Internationa Union of Crystallography ]

 

Scientific keywords

A. Sample category inorganic material
B. Sample category (detail) solid-state crystal, amorphous, glass
C. Technique absorption and its secondary process
D. Technique (detail) XAFS, EXAFS
E. Particular condition polarization (linear), room temperature
F. Photon energy X-ray (4-40 keV), X-ray (> 40 keV)
G. Target information chemical state, chemical bonding, local structure, function and structure, function

Industrial keywords

level 1---Application area mechanics, environment, Chemical product, industrial material, others
level 2---Target catalysis
level 3---Target (detail)
level 4---Obtainable information local structure, chemical state
level 5---Technique XAFS, NEXAFS

Inquiry number

SOL-0000001206

Last modified 2006-03-30 09:15
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