Journal
CATALYSIS TODAY
Volume 211, Issue -, Pages 29-38Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2013.04.002
Keywords
Steam methane reforming; Direct methane conversion; Shale gas; Hydrogen; Syngas; Exergy; Non-thermal plasma; Dielectric barrier discharge
Funding
- KAKENHI, Japan
- Japan Society for the Promotion of Science (JSPS)
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The reaction mechanism and energy efficiency analysis of non-thermal plasma assisted methane conversion are presented. Plasma catalysis is an innovative next-generation green technology that satisfies needs for energy and materials conservation, and environmental protection. Non-thermal plasma uniquely generates reactive species almost independently of reaction temperature. Those species initiate chemical reactions at remarkably lower temperatures than conventional thermochemical reactions. Low-temperature methane conversion is important because it minimizes exergy destruction accompanied by combustion of the initial feed, or production of high-temperature thermal energy, necessary for thermochemical methane reform. Non-thermal plasma has great flexibility to tune the process parameters so that energy and material consumption are minimized. This article explains aspects of plasma-assisted fuel reforming including arc plasma to non-thermal plasma. We specifically examine dielectric barrier discharge (DBD) as viable non-thermal plasma for practical fuel reforming. Second, the energy efficiency of non-oxidative methane conversion using DBD is analyzed. That energy efficiency determined by experimentation was 1%, although theoretical analysis suggested 8%, implying that DBD alone is invariably more inefficient. Finally, DBD-catalysts hybrid reaction is proposed and a synergistic effect between plasma-generated reactive species and catalysts is clarified, suggesting that vibrationally excited species are important for enhancing overall methane conversion efficiency with catalysts. (C) 2013 Elsevier B.V. All rights reserved.
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