Abstract
A high nitrogen oxides (NOx) 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 NOx 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 NOx. The results showed that the NOx removal rate over Ag/ZSM5 was higher than that over Cu/ZSM5. The NOx removal efficiency based on Ag/ZSM5 catalyst coupled with plasma exceeded 80% at low operating temperatures. The oxidation of NO to NO2 was approximately 100% at temperatures of 200–300 °C. Plasma-catalytic NOx 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 NOx removal.
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