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Comparative Plasma Chemical Reaction Studies of CH 4 /Ar and C 2 H m /Ar (m = 2,4,6) Gas Mixtures in a Dielectric Barrier Discharge
Author(s) -
Thejaswini H. C.,
Peglow S.,
Martens U.,
Sushkov V.,
Hippler R.
Publication year - 2014
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201300035
Subject(s) - acetylene , hydrogen , dielectric barrier discharge , analytical chemistry (journal) , fourier transform infrared spectroscopy , alkene , molecule , materials science , plasma , mass spectrometry , alkane , dielectric , chemical reaction , chemistry , hydrocarbon , organic chemistry , chemical engineering , physics , optoelectronics , chromatography , quantum mechanics , engineering , catalysis
Plasma chemical reactions in CH4/Ar and C 2 H m /Ar ( m = 2 , 4 , 6) gas mixtures in a dielectric barrier discharge at medium pressure (300 mbar) have been investigated. From mass spectrometry the production of H 2 and formation of larger hydrocarbons such as C n H m with up to n = 12 is inferred. Hydrogen release is most pronounced for CH 4 and C 2 H 6 gas mixtures. Fourier Transform InfraRed (FTIR) spectroscopy reveals the formation of substituted alkane (sp 3 ), alkene (sp 2 ), and alkyne (sp) groups from the individual gases which are used in this work. Abundant formation of acetylene occurs from C 2 H 4 and to a lesser extent from C 2 H 6 and CH 4 precursor gases. The main reaction pathway of acetylene leads to the formation of large molecules via C 4 H 2 and, eventually, to nano‐size particles. The experimental results are in reasonable agreement with simulations which predict a pronounced electron temperature and gas pressure dependency. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)