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Indexed by:期刊论文

Date of Publication:2018-01-01

Journal:PLASMA SCIENCE & TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:20

Issue:1

ISSN No.:1009-0630

Key Words:atmospheric pressure methane-air plasma; numerical simulation; methane dissociation; radical species recombination

Abstract: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.