| Summary: | 碩士 === 國立交通大學 === 應用化學系碩博士班 === 99 === The synergetic effect between Ni and V2O3 in carbon dioxide methanation was investigated using compositions, different loading, reaction temperature, amount of catalysts and synthetic routes. The catalysts were characterized by powder X-ray diffraction (PXRD), inductively coupled plasma-atomic emission spectrometer (ICP-AES), X-ray photoelectron spectroscopy (XPS) and temperature programmed reduction (TPR). Formation of Ni–V–O solid solution was confirmed by XPS and TPR studies. The optimal Ni/(Ni + V2O3) molar percent for the highest methane yield is found to be 40. The conversion of carbon dioxide to methane was increased as the amount of loading catalysts increased. Catalysts with Ni/(Ni + V2O3) molar percent of 40 were synthesized by sol-gel, hydrothermal and impregnation methods to study their catalytic activity for carbon dioxide methanation. The results indicate that catalyst prepared by sol-gel method exhibits better performance compared with other methods due to its well-dispersed particles that optimized the amount of triple phase boundaries (TPB) between gas phase and the catalyst. The catalyst with Ni/(Ni + V2O3) molar percent of 40 showed the best activity among other catalysts with the carbon dioxide conversion ~93(1) %, the selectivity of methane ~100(1) % at 400ºC, and very stable catalytic activity for 55 hours.
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