MULTIPLE OXIDE AND CATALYST FOR PURIFICATION OF EXHAUST GAS

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PROBLEM TO BE SOLVED : To provide a multiple oxide which has a pyrochlore structure realizing both a high oxygen occlusion/release capacity and a high heat resistance, and to produce a catalyst for purification of exhaust gas, which uses the multiple oxide as a carrier. SOLUTION : The multiple oxide has the pyrochlore structure containing Ce and Zr. The multiple oxide having the high oxygen occlusion/release capacity and the high heat resistance is obtained by replacing 40-90% of the Ce with rare-earth or alkaline-earth ions. The catalyst for purification of exhaust gas is obtained by using the multiple oxide as the carrier and depositing at least one noble metal such as Pt, Rh, Pd, Ir and Ru on the carrier.