NO是大气污染的主要成分,从微观上研究其脱除机理是提高NO脱除效率的关键问题.本研究采用发射光谱方法,分别对不同氧含量条件下NO负脉冲流光放电等离子体脱除过程进行了实验研究.研究结果表明:在无氧气参加反应的情况下,纯NO的脱除主要是快电子与NO的激发解离碰撞,即NO+e*→NO*+e→N*+O*+e,生成N原子和O原子,继而还原成N2和O2,从而达到NO脱除的目的;在富氧情况下,NO的脱除主要是在快电子参与下,NO与氧原子或氧分子发生氧化反应,转化为NO2,而不再是前者的还原脱除反应.
As an essential pollution gas,NO gas has drawn attentions for investigating its removal microscopic mechanism,in order to improve the removal efficiency.The fluorescence technique has been applied to analyze the NO removal dynamics with O2 or without O2 using negative pulsed streamer discharge plasma.Results indicate that,without the participation of O2,the direct collision dissociation between energetic electrons and NO molecular have played a major role for NO removal.Such a removal reacting pathway can be presented as NO+e*→NO*+e→N*+O*+e,which produces O and N atoms and then O2 and N2 molecules.With more oxygen,the major removal reaction of NO has been changed to the oxidation reaction to yield NO2 rather than the former reduction reaction.
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