| Summary: | 碩士 === 中原大學 === 化學工程研究所 === 93 === Reforming of methane and carbon dioxide via surface-wave microwave plasma was investigated. A series of experiments were conducted to determine methane with carbon dioxide conversion and product distributions over wide ranges of operation parameters. In the meanwhile, a mathematical model was also developed to characterize the chemical reactions taking place in methane/carbon dioxide plasmas. The model results were then compared with experimental measurements.
Experimental result showed that methane could be effectively converted in methane/carbon dioxide plasma. The CH4/CO2 ratio has extremely large effect on H2/CO ratio in the effluent. An increase in microwave power resulted in increases of hydrogen, carbon monoxide and acetylene selectivity. Increasing the feed flow rate made the conversion to decrease but the energy consumption was improved. The conversion of CH4 and CO2 were also improved when adding argon or helium to the plasma.
In the modeling studies, it was found that predictions of CH4/CO2 conversion and product flow rate agreed well with experimental data over a wide range of microwave power and CH4/CO2 flow rate. Sensitivity tests showed that the destruction of methane and carbon dioxide was not only caused by electron-impact but also by the radical induced reactions. Regarding to the product generation, hydrogen was not only formed by H-atom abstraction of hydrocarbons, but also by the recombination of H-atoms on the tube wall. Carbon monoxide was primarily formed by electron-impact dissociation of carbon dioxide, CHO+M®CO+H+M was also an important pathway.
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