等离子体与催化剂协同催化CH4选择性还原脱硝反应

研究了在低温等离子体和催化剂共同作用下,CH4选择催化还原(SCR)NO的反应.在所考察的金属氧化物催化剂中,γ-Al2O3表现出最高的催化活性.当等离子体放电功率为4.5 W,反应温度为300℃时,NO转化率为56.5％；该条件下单纯等离子体反应和以γ-Al2O3为催化剂时NO转化率分别为28.9％和0,表明等离子体...

Selective Catalytic Reduction of NO by CH_4 in Combination of Non-thermal Plasma and Catalysts

The selective catalytic reduction (SCR) of NO with CH4 was studied in combination of non-thermal plasma and catalysts. Among the series of metal oxides as catalysts, γ-Al2O3 exerts the highest activity. At 300 oC and the discharge power of 4.5 W, the NO conversion reaches 56.5% in the combination of plasma with γ-Al2O3, much higher than that in pure plasma mode (28.9%). At this temperature, no conversion of NO or CH4 was observed in pure catalytic reaction with γ-Al2O3 as the catalyst, indicating a synergistic function between the plasma and the catalyst. As further investigation shows, the catalytic activity has inverse correlation with dielectric constant on the whole. The porous structure and surface acidity of the catalysts obviously promote the plasma-assisted SCR of NO with CH4.