NOx STORAGE-REDUCTION CATALYST

摘要

PURPOSE: NOx storage - reducing catalyst is provided to have relatively high storage component after deterioration or sulfation. CONSTITUTION: A NOx storage - reducing catalyst comprises 1 ~ 5 weight% of transition metal selected from platinum, cobalt and manganese, 2 ~ 30 weight% of a Ba-K-Ce storage component, and 65 ~ 95 weight% of alumina. The Ba-K-Ce 3-componet storage component comprises 0.025 ~ 0.35 : 0.2 ~ 0.95 : 0.025 ~ 0.45 weight ratio of Ba, K Ce and BET non-surface area of the alumina is 50 m/g ~ 300 m/g.