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Laser-Ionization TOF Mass Spectrometer Characterization of Benzene Destruction in Atmospheric Pressure Pulsed Discharge 被引量:1
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作者 刘佳宏 肖青梅 +2 位作者 王丽萍 姚志 丁洪斌 《Plasma Science and Technology》 SCIE EI CAS CSCD 2009年第2期171-176,共6页
Benzene is a major industrial air pollutant and can cause serious human health disorders. In this paper an investigation on benzene destruction, in an atmospheric-pressure fast-flow pulsed DC-discharge by means of las... Benzene is a major industrial air pollutant and can cause serious human health disorders. In this paper an investigation on benzene destruction, in an atmospheric-pressure fast-flow pulsed DC-discharge by means of laser ionization combined with time-of-flight (TOF) mass spectrometry, is reported. Most by-products including transient reactive species from the benzene discharge were characterized by molecular beam sampling combined with TOF mass spectrometry. It is showed that, with a gas mixture of 0.5% C6H6 in Ar, benzene can be effectively destroyed by discharge plasma. The intermediate species consisted of small fragments of CnHm (n=3-5, m = 1-11), cycle-chain species of CnHm (n =6-9, m = 7-10) and polycyclic species CnHm (n ≥9, m = 8-12). The alternation of mass peaks (intensity) with even/odd electrons was observed in the measured mass spectra. The results indicated that the alternation is mainly due to the different ionization potentials of the open shell and close shell species. Based on the examination of the features of the species' composition, the primary reaction pathways are proposed and discussed. 展开更多
关键词 laser-ionization tof mass spectrometer benzene plasma VOCs
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