Composite oxide for PM combustion catalyst and filter

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PROBLEM TO BE SOLVED : To provide a composite oxide allowing low temperature combustion of PM (particulate matter) of a diesel engine exhaust gas without a precious metal element, and having heat resistance against the heat generated in PM combustion. SOLUTION : The composite oxide for a PM combustion catalyst is composed of Ce, Co, at least one kind of the following elements M, and oxygen, and the molar ratio of Ce, Co, and the element M satisfies the following conditions [b] : [b] when the molar ratio of Ce, Co, and the element M is expressed as Ce : Co : M=(1-x-y) : x : y, formulas 0COPYRIGHT : (C)2007, JPO&INPIT