| abstract |
The present disclosure provides catalyst compositions for NOx conversion and catalyst articles comprising such catalyst compositions. A particular catalyst composition is a zeolite, wherein sufficient Cu has been exchanged with the cationic sites of the zeolite such that the zeolite has a silica to alumina ratio of 5 to 20, the Cu/Al ratio of the zeolite is 0.1 to 0.5 and the CuO loading is 1% to 15% by weight. Wow; A copper trapping component comprising a copper trapping component comprising a plurality of particles having a particle size of about 0.5 microns to 20 microns in a concentration ranging from 1% to 20% by weight. A particular catalyst composition comprises, as a copper entrapment component , alumina having a plurality of alumina particles having a D 90 particle size distribution in the range of 0.5 microns to 20 microns. |