THERMALLY STABLE NH3-SCR CATALYST COMPOSITIONS.

摘要

A catalyst composition comprising a mixture of (a) a zeolite compound in an amount of from 10% to 60% by weight, wherein the zeolite compound comprises cations selected from Fe2+, Fe3+, Cu+, Cu2+ or mixtures thereof, and (b) a ceria/zirconia/alumina composite oxide, wherein the alumina content in said composite oxide is in the range of 20 to 80% by weight, in particular of 40 to 60% by weight, a catalyst comprising such catalyst composition and its use for exhaust gas after-treatment of diesel and lean burn engines.