| 摘要 |
PCT No. PCT/JP90/00752 Sec. 371 Date Feb. 11, 1991 Sec. 102(e) Date Feb. 11, 1991 PCT Filed Jun. 8, 1990 PCT Pub. No. WO90/14887 PCT Pub. Date Dec. 13, 1990.This invention relates to a purifying-catalyst for exhaust gas emitted from internal combustion engines such as automobiles, and the object is to provide a catalyst which exhibits excellent exhaust gas purification performance at lower temperature compared to usual catalysts, even after high temperature aging, and a process for preparation thereof. This object has been attained by an exhaust gas-purifying catalyst which has a structure to have at least two catalyst component-containing layers on a support having a monolithic structure, and wherein, as the catalyst components, the inner catalyst component-containing layer contains at least one element of the platinum group, activated alumina and cerium oxide, the outer catalyst component-containing layer contains at least one element of the platinum group, activated alumina and optionally a zirconium compound, and at least one of the inner catalyst component-containing layer and the outer catalyst component-containing layer further contains a coprecipitated ceria-stabilized zirconia.
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