Particulate filter

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PROBLEM TO BE SOLVED : To improve the performance of purifying exhaust gas ingredients, including HCs, CO and particulates, and the heat resistance of the performance. SOLUTION : A catalyst metal is supported by a support material in which primary particles of activated alumina and those of a composite oxide containing Ce, Zr and a rare earth metal R other than Ce are mixed to form secondary particles. The primary particles of the composite oxide contain CeO2at a ratio of 20-60 mol%. COPYRIGHT : (C)2009, JPO&INPIT