EXHAUST GAS PURIFYING CATALYST AND ITS MANUFACTURING METHOD

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PROBLEM TO BE SOLVED : To maintain activity-maintaining effects of noble metal particles without increasing a manufacturing cost and an environment load. SOLUTION : An exhaust gas purifying catalyst comprises a noble metal particle 1, a first compound 2 supporting the noble metal particle 1 and suppressing a movement of the noble metal particle 1, and a second compound 3 which involves the noble metal particle 1 and the first compound 2, suppresses the movement of the noble metal particle 1, and at the same time, suppresses an aggregation of the first compounds 2 accompanying a mutual contact of the first compounds 2. The first compound is a composite containing rare earth elements. COPYRIGHT : (C)2009, JPO&INPIT