EXHAUST GAS PURIFYING CATALYST

摘要

PROBLEM TO BE SOLVED: To provide an exhaust gas purifying catalyst which controls migration of rhodium(Rh) to a lower layer and sintering and exerts high NOxpurifying performance over a wide temperature range including high-temperature ranges.

SOLUTION: The catalyst includes the first catalyst layer with platinum and/or palladium supported and the second catalyst layer in which rhodium is supported in a support containing alumina solid-dissolved with lanthanum oxide and ceria zirconia sold-dissolved with lanthanum oxide in a ratio of the lanthanum oxide to the total mass of the support of 1-7 mass%, in this order from the side of the supporting substrate, on a supporting substrate.

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