CATALYST FOR PURIFYING EXHAUST GAS

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PROBLEM TO BE SOLVED : To provide a catalyst for purifying exhaust gas which hardly causes lowering of activity even when used under environment of high temperature and high oxygen concentration. SOLUTION : The catalyst for purifying exhaust gas contains a rare earth element, an alkaline earth element, zirconium and a noble metal, wherein an atomic ratio of the alkaline earth element to the sum of the rare earth element and the zirconium is ≥10 atomic%, a part of the rare earth element and a part of the zirconium form a composite oxide with at least a part of the alkaline earth element, and the composite oxide and a part of the noble metal form a solid solution. COPYRIGHT : (C)2007, JPO&INPIT