8-ring small pore molecular sieve with promoter to improve low temperature performance

摘要

Described is a selective catalytic reduction catalyst comprising an 8-ring small pore molecular sieve promoted with copper and an alkaline earth component. The catalyst is effective to catalyze the reduction of nitrogen oxides (NOx) in the presence of a reductant. A method for selectively reducing nitrogen oxides is also described.

主权项

1. A selective catalytic reduction catalyst comprising an 8-ring small pore molecular sieve promoted with copper and an alkaline earth component, wherein the catalyst is effective to catalyze the reduction of nitrogen oxides in the presence of a reductant, wherein the 8-ring small more molecular sieve has a crystallite size in the range of from 10 nanometers to 100 micrometers, and wherein the alkaline earth component is present in an amount of less than 5% by weight.