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论文类型：期刊论文

发表时间：2018-01-01

发表刊物：PLASMA SCIENCE & TECHNOLOGY

收录刊物：SCIE、EI、Scopus

卷号：20

期号：1

ISSN号：1009-0630

关键字：atmospheric pressure methane-air plasma; numerical simulation; methane dissociation; radical species recombination

摘要：Recently, low-temperature atmospheric pressure plasmas have been proposed as a potential type of 'reaction carrier' for the conversion of methane into value-added chemicals. In this paper, the multi-physics field coupling software of COMSOL is used to simulate the detailed discharge characteristics of atmospheric pressure methane-air plasma. A two-dimensional axisymmetric fluid model is constructed, in which 77 plasma chemical reactions and 32 different species are taken into account. The spatial density distributions of dominant charged ions and reactive radical species, such as CH4+, CH3+, N-2(+), O-2(+), H, O, CH3, and CH2, are presented, which is due to plasma chemical reactions of methane/air dissociation (or ionization) and reforming of small fragment radical species. The physicochemical mechanisms of methane dissociation and radical species recombination are also discussed and analyzed.