| abstract |
(57) [Summary] [Objective] In a three-way catalyst using only palladium as a catalyst component, by preventing sintering of palladium, CO, HC and NO can be obtained not only in the initial stage but also after the endurance. x can be stably purified. [Structure] Exhaust gas purifying comprising a monolith carrier and a catalyst supporting layer formed from activated alumina and a catalytically active component composed of palladium, alkaline earth metal, cerium oxide and zirconium oxide coated on the monolith carrier The catalyst is characterized in that palladium and alkaline earth metal are supported on the surface of the catalyst supporting layer with high density. Since palladium is in intimate contact with the alkaline earth metal, sintering of the palladium is prevented. |