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Indexed by:期刊论文

Date of Publication:2009-04-01

Journal:PLASMA SCIENCE & TECHNOLOGY

Included Journals:SCIE、EI、CSCD、Scopus

Volume:11

Issue:2

Page Number:171-176

ISSN No.:1009-0630

Key Words:laser-ionization; TOF mass spectrometer; benzene plasma; VOCs

Abstract: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% C(6)H(6) in Ar, benzene can be effectively destroyed by discharge plasma. The intermediate species consisted of small fragments of C(n)H(m) (n=3 similar to 5, m=1 similar to 11), cycle-chain species of C(n)H(m) (n=6 similar to 9, m=7 similar to 10) and polycyclic species C(n)H(m) (n >= 9, m=8 similar to 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.