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《JOURNAL OF MOLECULAR CATALYSIS (CHINA)》 2000-02
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Phase Purity of CeO_2 ZrO_ 2 Solid Solutions and their Effects on Three way Catalysts

XIAO Li, LIN Pei yan, YANG Zhi bo, WANG Wen dong (Department of Chemical Physics, University of Science and Technology of China, Hefei 230026)  
A series of CeO 2 ZrO 2 and CeO 2 ZrO 2 La\-2O\-3 solid solutions were prepared by modified sol gel method and organic solvent decomposition method. The phase, structure and thermal stability of solid solutions were investigated by XRD and LRS at different calcining temperatures. The oxygen storage capacity(OSC), BET surface area and catalytic activity of these samples were also evaluated. A combined analysis of XRD and LRS can give precise information on the structure and phase purity of CeO 2 ZrO 2 solid solutions. It is shown that the product of modified sol gel method possesses higher OSC, purer fluorite cubic phase ,but lower thermal stability than that of organic solvent decomposition method. It is also shown that the light off temperatures of CO, NO and C 3H 6 for aged catalysts containing CZO or LCZO are much lower than that of containing CeO 2 in synthetic car exhaust.
【Fund】: 福特 -中国研究和发展基金! ( No. 9712 3 0 1)
【CateGory Index】: O614.33
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