Study of Steam Enhanced Dry Reforming of Methane Using Bimetallic Catalysts
| Autor: | Zheng-Wei Yang, 楊政緯 |
|---|---|
| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 In this study, syngas production from catalytic dry reforming of biogas was experimentally studied. The Ni/Al2O3, Pt/Al2O3, and Pt-Ni/Al2O3 were used as the catalysts, prepared by wet impregnation method, and characterized by N2 physisorption (BET), hydrogen temperature programmed reduction (H2-TPR), and X-ray diffraction (XRD). A continuous flow tubular reactor was built to perform the catalytic reaction tests, and the following reaction variables were analyzed: reaction temperature (600~800°C) and CH4/CO2 ratio (1/0.25~1/1). Due to endothermic reaction, increasing the reaction temperature led to higher conversions of CH4 and CO2 and yields of H2 and CO. From the measured results, it was found that the bimetallic 3wt%Pt-10wt% Ni/Al2O3 catalyst has the best performance among the catalysts prepared. It was also found that CH4 conversion and H2 yield can be enhanced when biogas contained more CO2. However, CO2 conversion and CO yield decreased. With the addition of steam in the reaction, it was found that CH4 conversion and H2 yield can be enhanced due to the dominance of steam reforming of methane. The H2/CO ratio higher than one can be obtained. However, low or even negative CO2 conversion was resulted due to the enhancement of water-gas shift reaction. From stability test, it was found that Pt-Ni/Al2O3 has better thermal stability than Ni/Al2O3 catalyst. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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