Evaluation of Low-Temperature NOx Removal Over Ag/ZSM5 and Cu/ZSM5 Catalysts Coupled With Plasma

A high nitrogen oxides (NO _x ) removal rate under fluctuating temperature condition still remains a challenge to be solved. The plasma can be a potential solution to overcome this problem. This article reported catalytic NO _x removal coupled with plasma in a wide temperature range below 350 °C. Silver (Ag) and copper (Cu) supported on ZSM5 zeolite were used as the catalysts to remove NO _x . The results showed that the NO _x removal rate over Ag/ZSM5 was higher than that over Cu/ZSM5. The NO _x removal efficiency based on Ag/ZSM5 catalyst coupled with plasma exceeded 80% at low operating temperatures. The oxidation of NO to NO ₂ was approximately 100% at temperatures of 200-300 °C. Plasma-catalytic NO _x removal mechanisms at low temperatures were discussed. This article demonstrated that the plasma-coupled Ag/ZSM5 catalyst can be an efficient solution for low-temperature NO _x removal.