Progress of selective catalytic reduction of NO_x with methane over zeolite-based catalysts

Selective catalytic reduction of NOx is an efficient technique to remove NOx in the presence of excess oxygen for both stationary and mobile sources.Selective catalytic reduction of NO with methane(CH4-SCR)has received considerable attention because methane is low cost and easily obtained.Characterized with high catalytic activity,zeolite-based catalysts have been widely studied.In this paper,the advances in zeolite-based catalysts for CH4-SCR are reviewed,with focus on catalytic activity,reaction mechanism and the promotion effect of the main four types of Co,Pd,In and Ag catalysts supported on zeolite.By comparing the properties of these catalysts,the application and further research direction on zeolite-based catalyst of CH4-SCR are proposed.