| abstract |
(57) Abstract: An exhaust gas purifying catalyst having high exhaust gas purifying performance capable of preventing early deterioration caused by poisoning by a toxic substance in exhaust gas. In an exhaust gas purifying catalyst 3, a lower catalyst layer 5 in which palladium is supported on lanthanum-impregnated alumina is formed on a honeycomb carrier 4, and rhodium is further deposited on the lower catalyst layer 5. An upper catalyst layer 6 supported on lanthanum-impregnated alumina is formed. here, Nickel oxide powder is added to the lower catalyst layer 5. In the lower catalyst layer 5, nickel oxide prevents or suppresses poisoning of palladium by a toxic substance such as hydrogen sulfide, prevents early deterioration of the exhaust gas purification catalyst 3 and improves exhaust gas purification performance. To be enhanced. |