A New Strategy for Improving the Efficiency of Low-temperature Selective Catalytic Reduction of NO _x with CH₄ via the Combination of Non-thermal Plasma and Ag₂O/TiO₂ Photocatalyst

Abstract

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 CH₄, 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%Ag₂O/TiO₂ showed the highest catalytic activity for NO _x removal due to the utilization of near ultraviolet light. The conversion of NO _x to N₂ over the in-plasma 1%Ag₂O/TiO₂ 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 Ag₂O/TiO₂ catalyst were unchanged throughout the non-thermal plasma and photocatalytic processes, implying the superior stability of the catalyst.

Keywords

Non-thermal plasma / Photocatalyst / NO _x / Ag₂O/TiO₂ / CH₄

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