Catalytic reduction of NOx by ammonia over nickel and lanthanum supported on zeolite

Abstract

The effects of oxygen and water on the reduction of NO by NH3 over metal supported H-ZSM-5 catalysts have been determined. The catalysts have been prepared by wet impregnation method and characterized by X-ray diffraction and BET surface area. Higher NOx reduction rate is obtained over Ni/ZSM-5 catalyst compared with La/ZSM-5 and H-ZSM-5. In presence of water vapour the NOx rate has been found to be lower than in the absence of water vapour. Oxygen promotes SCR reaction in forming reactive intermediate species for the reduction of NO by NH3.