EXHAUST GAS PURIFYING CATALYST AND PRODUCING METHOD THEREOF

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PROBLEM TO BE SOLVED : To keep an effect of enhancing the activity of noble metal particles by a promoter component without increasing the production cost and a load on the environment. SOLUTION : An exhaust gas purifying catalyst includes a catalyst particle unit 10 having at least noble metal 11 with a catalytic function, first oxides 12 on which the noble metal 11 is supported, and second oxides 13 covering the first oxides 12 on which the catalyst noble metal 11 is supported. At least one type of compounds 14 selected from the group consisting of a transition element, an alkaline earth metal element, an alkali metal element, and a rare earth element, which is a promoter component, are contained in catalyst powder formed of an aggregate of a plurality of pieces of the catalyst particle units 10. COPYRIGHT : (C)2008, JPO&INPIT