Dry Reforming of Methane with DBD and Ferroelectrics Packed-bed DBD Reactors
| Autor: | Wei-chieh Chung, 鍾瑋杰 |
|---|---|
| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 Global warming has been a big concern since 20th century and how to reduce the emissions of greenhouse gases (GHGs) into atmosphere has become an important issue. Carbon dioxide reforming of methane to generate syngas has the advantages of converting two major GHGs simultaneously and producing syngas to be utilized as fuel or as feedstock of Fischer-Tropsch process. This study is motivated to reform CH4 with CO2 via dielectric barrier discharge (DBD), and catalyst packed bed composed by BaZr0.75Ti0.25O3 (BZT, εr = 149) or BaFe0.5Nb0.5O3 (BFN, εr = 2025) prepared by sol-gel method. The results show that with the conditions of CH4/CO2 ratio of 1, applied voltage of 13.6 kV, frequency of 20,000 Hz and flow rate of 40 mL/min, the CO2 conversions achieved with DBD alone, BZT packed bed and BFN packed bed are 43.4%, 52.7% and 57.0%, respectively, in the meantime, methane conversion efficiencies are 64.6%, 66.4% and 72.0%, respectively. The energy efficiency achieved with plasma alone is 3.66 mol/kWh, and it increases to 3.81 mol/kWh and 3.83 mol/kWh, respectively, as BZT and BFN are used as the catalyst. The results proved the combination of DBD and relaxor ferroelectric induces synergistic effect and enhances DRM. Moreover, with feeding CH4/CO2 ratio of 3, applied voltage of 13.6 kV, frequency of 20,000 Hz, flow rate of 40 mL/min and with BFN packed bed reactor, energy efficiency reaches 5.16 mol/kWh which is significantly higher than that achieved with plasma alone. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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