| 简介 |
PROBLEM TO BE SOLVED : To provide a catalyst for purifying exhaust gas, the deterioration of whose activity can be restrained by restraining the grain growth of a noble metal even if the catalyst for purifying exhaust gas is exposed in high-temperature exhaust gas for a long time and which can be regenerated by breaking up the noble metal, which is exposed in high-temperature exhaust gas for the long time and grain-grown, again into satisfactorily minute noble metal particles. SOLUTION : The catalyst for purifying exhaust gas comprises : a compound oxide particle A which consists of alumina and a first basic oxide containing at least one element selected from the group consisting of alkaline-earth elements, rare earth elements and 3A group elements and the content of which is 5-50 mass%; another compound oxide particle B consisting of zirconia and a second basic oxide containing at least one element selected from the group consisting of alkaline-earth elements, rare earth elements and 3A group elements; an additional component which is deposited on the compound oxide particle B and contains at least one element selected from the group consisting of alkaline-earth elements, rare earth elements and 3A group elements; and the noble metal deposited on the compound oxide particle B at least. COPYRIGHT : (C)2008, JPO&INPIT |
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