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Korean Journal of Chemical Engineering, Vol.25, No.5, 1205-1207, 2008
Preparation of CeO2-ZrO2 mixed oxide with high surface area and high thermal stability
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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