等离子体与催化剂协同催化CH_(4)选择性还原脱硝反应  

Selective Catalytic Reduction of NO by CH_(4) in Combination of Non-thermal Plasma and Catalysts

作　　者：刘彤[1] 于琴琴[1] 王卉[1] 蒋晓原[1] 郑小明[1] 

机构地区：[1]浙江大学催化研究所,浙江杭州310028

出　　处：《催化学报》2011年第9期1502-1507,共6页

基　　金：国家自然科学基金(20977080);浙江省自然科学基金(J20091504,Y5090092);浙江省重点项目(2009C11141)

摘　　要：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4.5W,反应温度为300oC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,表明等离子体与催化剂之间发生了协同催化作用.进一步研究表明,在低温等离子体的SCR-NO反应中,催化剂活性随着介电常数的增加而下降,而催化剂多孔结构和表面酸性可明显促进反应的进行.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.

关 键 词：甲烷 氮氧化物 选择催化还原 Γ-氧化铝 低温等离子体 协同作用 

分 类 号：O643.36[理学—物理化学] X701[理学—化学]