甲烷等离子体法制氢气和碳材料研究进展.

Production of hydrogen from methane in traditional way is accompanied by a mass of carbon dioxide emission. Pyrolysis of methane via plasma for the production of hydrogen and carbon materials could avoid the carbon dioxide emission and provide a way for the high added-value utilized of methane. Therefore, this paper reviews and analyzes domestic and foreign main research progresses on the production of hydrogen and carbon materials by methane pyrolysis using plasma in recent years by means of literature investigation. And the following research results were obtained. First, thermal and cold plasma are the mainly used in the methane pyrolysis. The active species in cold plasma are the high-energy free electrons, the active species in thermal plasma are the high-energy free electrons and heavy particles. Second, the ways to produce cold plasma mainly include corona discharge, dielectric barrier discharge, gliding arc and the power need for generation cold plasma is low. The ways to produce thermal plasma mainly include direct current arc discharge, direct current-radio frequency discharge and the power need for generation thermal plasma is high. Third, the methane conversion and the hydrogen productive rate are related to the plasma gas, the molar ratio between methane and plasma gas, the gas discharge power, the configuration of electrode and the structure of reaction chamber. Fourth, the morphology of carbon materials from methane pyrolysis by plasma differs significantly. The form of carbon materials cloud be carbon black, carbon nanotube, carbon graphene nanosheet and so on, different morphology could be obtained by adjusting the operational condition and configuration of electrode. In conclusion, methane pyrolysis by plasma can reduce the emission of greenhouse gas, moreover, provide a new way for the high added-value utilization of methane. In the future, increasing the energy efficiency for hydrogen production and the selectivity for production of carbon materials are the development direction of methane pyrolysis by plasma. [ABSTRACT FROM AUTHOR]