Study of Non-Thermal DC Arc Plasma of CH4/Ar at Atmospheric Pressure Using Optical Emission Spectroscopy and Mass Spectrometry

LIAO Mengran (廖梦然); WANG Yu (王毓); WU Hanfeng (吴涵峰); LI Hui (李辉); XIA Weidong (夏维东)

doi:10.1088/1009-0630/17/9/05

Plasma Science and Technology > 2015 > 17(9): 743-748. > DOI: 10.1088/1009-0630/17/9/05

LIAO Mengran (廖梦然), WANG Yu (王毓), WU Hanfeng (吴涵峰), LI Hui (李辉), XIA Weidong (夏维东). Study of Non-Thermal DC Arc Plasma of CH4/Ar at Atmospheric Pressure Using Optical Emission Spectroscopy and Mass Spectrometry[J]. Plasma Science and Technology, 2015, 17(9): 743-748. DOI: 10.1088/1009-0630/17/9/05

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Study of Non-Thermal DC Arc Plasma of CH4/Ar at Atmospheric Pressure Using Optical Emission Spectroscopy and Mass Spectrometry

1Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China 2National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China

Funds: supported by National Natural Science Foundation of China (Nos. 11035005, 11475174, 50876101) and USTC-NSRL Association Funding (No. KY2090130001)

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Received Date: December 17, 2014

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Abstract

Abstract

Non-thermal C/H/Ar plasmas are widely applied to carbonaceous material produc?tion and processing. In this work, plasma parameters and gaseous species of the atmospheric non-thermal C/H/Ar plasmas produced by an atmospheric-pressure DC arc discharge generator in CH4/Ar were investigated. The voltage-current characteristics were measured for different CH4/Ar ratios. Optical emission spectroscopy was employed to analyze the electron excitation temperature, gas temperature and electron density under various discharge conditions. The hy?drocarbon molecules produced in the CH4/Ar plasmas were detected with photoionization mass spectrometry. The optical spectral results demonstrated that the electron excitation temperature was 0.4-1eV, the gas temperature was 2800-4200 K and the electron density was in the range of (5-20)×1015 cm?3 . The mass spectrum indicated that a variety of unsaturated hydrocarbons (C2H4,C3H6,C6H6, etc.) and several highly unsaturated hydrocarbons (C4H2,C5H6, etc.) were produced in the non-thermal arc plasmas.

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References

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