Composite oxide catalyst

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PROBLEM TO BE SOLVED : To produce a composite oxide catalyst having high selectivity with respect to a target substance and used for producing an unsaturated acid or unsaturated nitrile. SOLUTION : The composite oxide catalyst contains a component X (X being at least one kind of element selected from alkaline earth metal elements and rare earth elements) and a component Y (Y being at least one kind of element selected from Te and Sb) and the atomic ratio (d) per one mol of the component X satisfies 0COPYRIGHT : (C)2006, JPO&NCIPI