Phase-Resolved Measurement of Atmospheric-Pressure Radio-Frequency Pulsed Discharges in Ar/CH4/CO2 Mixture

Liu, Zehui, Huang, Bangdou, Zhu, Wenchao, Zhang, Cheng, Tu, Xin ORCID: 0000-0002-6376-0897 and Shao, Tao (2020) Phase-Resolved Measurement of Atmospheric-Pressure Radio-Frequency Pulsed Discharges in Ar/CH4/CO2 Mixture. Plasma Chemistry and Plasma Processing, 40 (4). pp. 937-953. ISSN 0272-4324, 1572-8986

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Official URL: https://doi.org/10.1007/s11090-020-10071-5

Abstract

In order to comprehensively investigate the discharge characteristics of an atmospheric-pressure radio-frequency (RF) pulsed discharge in Ar/CH4/CO2, a phase-resolved measurement is given in this paper. Firstly, the discharge characteristics of RF plasma in a gas mixture of Ar, CO2 and CH4 are investigated under different parameters. It is found peak power is more efficient than duty cycle in increasing the discharge area. Besides, a phase-resolved morphology of RF plasma is given. The discharge in the positive cycle is longer in length and stronger in emission intensity than in the negative cycle. Secondly, different activation paths of species have been obtained by using phase-resolved optical emission spectroscopy. Ar species is mainly activated by electron collision effect, while CH and C2 are mainly activated by Ar metastable species. Finally, detailed electron kinetics is analyzed. The results show that most energy is transferred to the vibrational excitation compared to elastic activation, electronic excitation, and ionization under different ratios of CO2 and CH4 to Ar. Besides, under a higher ratio of CH4 and CO2 to Ar, the generating rate of species and power loss rate are higher. It proves that higher fraction of CO2 and CH4 is better for the conversion rate and energy efficiency under RF discharge in theory, which guides the reforming of CH4 and CO2 in RF discharge.

Item Type:	Article
Uncontrolled Keywords:	Radio-frequency plasma, Optical emission spectroscopy, Dry reforming of methane, Discharge characteristics, Activation modes
Depositing User:	Symplectic Admin
Date Deposited:	11 May 2020 10:06
Last Modified:	07 Dec 2024 01:08
DOI:	10.1007/s11090-020-10071-5
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3086895