Composite oxide for PM combustion catalyst and filter

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PROBLEM TO BE SOLVED : To provide a composite oxide having catalytic activity capable of combusting PM of the exhaust gas of a diesel engine at a low temperature without containing a noble metal element and heat resistance capable of withstanding the generation of heat at the time of combustion of PM. SOLUTION : The composite oxide is used for a PM combustion catalyst which is constituted of Ce, a transition metal element T, at least one kind of an element M and oxygen, and characterized in that the molar ratio of Ce, the transition metal element T and the element M satisfies the following formulae [a] : 0COPYRIGHT : (C)2007, JPO&INPIT