Conversion of coalbed methane surrogate into hydrogen and graphene sheets using rotating gliding arc plasma

Angjian WU (吴昂键); Hang CHEN (陈航); Jiageng ZHENG (郑佳庚); Jian YANG (杨健); Xiaodong LI (李晓东); Changming DU (杜长明); Zhiliang CHEN (陈志良); Aoni XU (徐奥妮); Jie QIU (邱杰); Yi XU (徐一); Jianhua YAN (严建华)

doi:10.1088/2058-6272/ab21a2

Plasma Science and Technology > 2019 > 21(11): 115501. > DOI: 10.1088/2058-6272/ab21a2

Angjian WU (吴昂键), Hang CHEN (陈航), Jiageng ZHENG (郑佳庚), Jian YANG (杨健), Xiaodong LI (李晓东), Changming DU (杜长明), Zhiliang CHEN (陈志良), Aoni XU (徐奥妮), Jie QIU (邱杰), Yi XU (徐一), Jianhua YAN (严建华). Conversion of coalbed methane surrogate into hydrogen and graphene sheets using rotating gliding arc plasma[J]. Plasma Science and Technology, 2019, 21(11): 115501. DOI: 10.1088/2058-6272/ab21a2

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Conversion of coalbed methane surrogate into hydrogen and graphene sheets using rotating gliding arc plasma

¹ State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, People's Republic of China
² School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
³ Department of Material Science and Engineering, University of California at Berkeley, Berkeley, California 94720, United States of America

Funds: The project was supported by the Foundation for Innovative Research Groups of National Natural Science Foundation of China (No. 51621005), China Postdoctoral Science Foundation (No. 2018M630672).

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Received Date: January 14, 2019
Revised Date: May 13, 2019
Accepted Date: May 13, 2019

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Abstract

Abstract

The use of atmospheric rotating gliding arc (RGA) plasma is proposed as a facile, scalable and catalyst-free approach to synthesizing hydrogen (H₂) and graphene sheets from coalbed methane (CBM). CH₄ is used as a CBM surrogate. Based on a previous investigation of discharge properties, product distribution and energy efficiency, the operating parameters such as CH₄ concentration, applied voltage and gas flow rate can effectively affect the CH₄ conversion rate, the selectivity of H₂ and the properties of solid generated carbon. Nevertheless, the basic properties of RGA plasma and its role in CH₄ conversion are scarcely mentioned. In the present work, a 3D RGA model, with a detailed nonequilibrium CH₄/Ar plasma chemistry, is developed to validate the previous experiments on CBM conversion, aiming in particular at the distribution of H₂ and other gas products. Our results demonstrate that the dynamics of RGA is derived from the joint effects of electron convection, electron migration and electron diffusion, and is prominently determined by the variation of the gas flow rate and applied voltage. Subsequently, a combined experimental and chemical kinetical simulation is performed to analyze the selectivity of gas products in an RGA reaction, taking into consideration the formation and loss pathways of crucial targeted substances (such as CH₄, C₂H₂, H₂ and H radicals) and corresponding contribution rates. Additionally, the effects of operating conditions on the properties of solid products are investigated by scanning electron microscopy (SEM) and Raman spectroscopy. The results show that increasing the applied voltage and decreasing CH₄ concentration will change the solid carbon from its initial spherical structure into folded multilayer graphene sheets, while the size of the graphene sheets is slightly affected by the change in gas flow rate.
- coalbed methane,
- hydrogen,
- graphene sheets,
- rotating gliding arc (RGA),
- multi-physical field coupling,
- plasma chemistry

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Conversion of coalbed methane surrogate into hydrogen and graphene sheets using rotating gliding arc plasma