High-Efficiency Removal of NOx Using a Combined Adsorption-Discharge Plasma Catalytic Process

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• 作者：Qinqin Yu ; Hui Wang ; Tong Liu ; Liping Xiao ; Xiaoyuan Jiang ; Xiaoming Zheng
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：February 21, 2012
• 年：2012
• 卷：46
• 期：4
• 页码：2337-2344
• 全文大小：453K
• 年卷期：v.46,no.4(February 21, 2012)
• ISSN：1520-5851

文摘

A combined adsorption-discharge plasma catalytic process was used for the removal of NO_x using zeolites as catalysts without external heating. It was found that the types of plasma carrier gases exert great effect on the conversion of adsorbed NO_x. The conversion of adsorbed NO_x is much lower in N₂ plasma than in Ar plasma, which is attributed to the reverse reaction, NO_x formation reaction. The momentary increase of oxygen species derived from the decomposition of adsorbed NO_x is considered to be the main cause as their collisions with nitrogen species can generate NO_x again. Thus, solid carbon was added to the catalyst to act as a scavenger for active oxygen species to improve the conversion of adsorbed NO_x in N₂ plasma. A NO_x removal rate of 97.8% was obtained on 8.5wt.% carbon mixed H-ZSM-5 at an energy efficiency of 0.758 mmol NO_x/W路h.