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Received December 28, 2007
Accepted March 8, 2008
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Preparation of CeO2-ZrO2 mixed oxide with high surface area and high thermal stability
Department of Catalysis Science and Technology, School of Chemical Engineering, Tianjin University, Tianjin 300072, China
Korean Journal of Chemical Engineering, September 2008, 25(5), 1205-1207(3), 10.1007/s11814-008-0199-7
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Abstract
Ceria-zirconia solid particles have been recognized as a key material of the automotive exhaust catalysts since they can release and uptake oxygen owing to the rapid reversible oxidation states of cerium between Ce3+ and Ce4+. Several methods have recently been described to prepare the CeO2-ZrO2 solid particles used in the catalysts. In this paper, a new coprecipitation method is used to prepare the CeO2-ZrO2 solid particles. The Ce-Zr alcogel is dried and calcined in flowing N2 not in flowing air under atmospheric pressure. The results show that the ceria-zirconia sample calcined at 650℃ has high surface area over 90 m2g-1, which drops to 40 m2g-1 following treatment at 900 ℃.
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References
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Yao MH, Baird RJ, Kunz FW, Hoost TE, J. Catal., 166(1), 67 (1997)
Xu BQ, Wei JM, Yu YT, Li JL, Zhu QM, Top. Catal., 22, 77 (2003)
