Overview on the selective lean NOx reduction by hydrocarbons over Pt-based catalysts

Abstract

Selective catalytic reduction of NOx with hydrocarbons (HC-SCR) has received much attention as one of potential technologies for reducing NOx emissions under lean-burn conditions. Pt/ZSM-5 prepared by sublimation method and Pt/V/MCM-41 catalysts have been introduced for the wider activity temperature window than those Pt catalysts reported previously. The influence of pre-treatment, oxygen concentration, water and SO2 on the activities of Pt-based catalysts has been discussed. Combinatorial catalysis, which has been developed recently for discovering the practical HC-SCR catalysts quickly, has been introduced too. Finally, the reaction mechanism of HC-SCR over Pt-based catalysts has been briefly discussed.