Patent ID: 8802582

Claim:
A catalyst for selective catalytic reduction of nitrogen oxides with ammonia at exhaust temperatures greater than about 300° C., the catalyst comprising: a first component comprising a zeolite selected from the group consisting of ZSM-5, zeolite beta, and mixtures thereof, wherein the catalyst comprises about 40 to about 80 weight percent zeolite; a second component comprising at least one member selected from the group consisting of cerium, iron, manganese, and mixtures thereof; and about 30 to about 60 weight percent of an oxygen storage material, based on the entire catalyst composition, wherein the oxygen storage material composition comprises Ce 1-c-d Zr c Lan d O 2 , where Lan is one or more of Y, La, Pr, Nd, Sm, Eu, Gd, Ho, Yb, the weight percent of the oxygen storage material is on the basis of the oxides in the oxygen storage material; optionally, an inorganic oxide component; wherein the catalyst comprises about 5 to about 20 weight percent of the second component, where the weight percentage of the second component is calculated based on the total metal content relative to the total weight of the zeolite, oxygen storage material and any inorganic oxide.