本文主要研究内容
作者吴昂键,陈航,郑佳庚,杨健,李晓东,杜长明,陈志良,徐奥妮,邱杰,徐一,严建华（2019）在《Conversion of coalbed methane surrogate into hydrogen and graphene sheets using rotating gliding arc plasma》一文中研究指出：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.
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.
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论文作者分别是来自Plasma Science and Technology的吴昂键,陈航,郑佳庚,杨健,李晓东,杜长明,陈志良,徐奥妮,邱杰,徐一,严建华，发表于刊物Plasma Science and Technology2019年11期论文，是一篇关于,Plasma Science and Technology2019年11期论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自Plasma Science and Technology2019年11期论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。