| abstract |
【Task】 Nitrogen oxide occlusion and reduction ability is excellent, nitrogen oxide occlusion and reduction ability is excellent both before and after degradation and before and after SO 2 conversion, and nitrogen oxide occlusion and reduction catalyst has a nitrogen oxide occlusion and reduction ability even in a low temperature environment. development of. [Solution] A support containing any one of alkali metal or alkaline earth metal and alumina, one or more nitrogen oxide storage elements selected from the group consisting of alkali metals, alkaline earth metals or rare earth elements, platinum, palladium, ruthenium, There is provided a nitrogen oxide storage reduction catalyst containing at least one noble metal selected from the group consisting of silver, gold, and rhodium. The carrier containing either alkali metal or alkaline earth metal and alumina is more preferably a carrier containing either lithium or magnesium and alumina. [Selection] Figure 1 |