Novel Sn-Ce/Al2O3 catalyst for the selective catalytic reduction of NOx under lean conditions

Abstract

Effect of additives, Ce and Mn, on the catalytic performance of Sn/Al2O3 catalyst prepared by sol-gel method for the selective reduction of NOx with propene under lean conditions was studied. Sn-Ce/Al2O3 catalysts exhibited higher activity than Sn/Al2O3 catalyst and the optimum Ce loading is 0.5-1%. The promoting effect of Ce is to enhance the oxidation of NO to NO2 and facilitate the activation of propene, both of which are important steps for the NOx reduction. The presence of oxygen contributes to the oxidation of NO and shows a promoting effect.