A New Strategy for Improving the Efficiency of Low-temperature Selective Catalytic Reduction of NOx with CH4via the Combination of Non-thermal Plasma and Ag2O/TiO2 Photocatalyst

In the present work, a remarkable combination of non-thermal plasma and photocatalyst was developed to widen the operating temperature window of selective catalytic reduction(SCR) of NO x with CH 4 , especially to improve the low-temperature removal efficiency of NO x . It was shown that the operating temperature window was significantly widened. Among all the catalysts prepared, 1%Ag 2 O/TiO 2 showed the highest catalytic activity for NO x removal due to the utilization of near ultraviolet light. The conversion of NO x to N 2 over the in-plasma 1%Ag 2 O/TiO 2 photocatalyst at 60 and 300 °C could achieve 31.8% and 53.0%, respectively. The combination mode of plasma and catalyst affected NO x removal efficiency greatly, the in-plasma catalysis outperformed the post-plasma catalytic mode remarkably, signifying the contribution of photocatalytic processes on the catalysts. Meanwhile, the characterizations of the catalyst demonstrated that the morphology and structure of the Ag 2 O/TiO 2 catalyst were unchanged throughout the non-thermal plasma and photocatalytic processes, implying the superior stability of the catalyst.