Performance of Commercial Catalysts for CO2 Methanation at a Fixed-Bed Reactor

• Main Authors: LIU, TE-CHIH, 劉德治
• Other Authors: CHEN, YEN-CHO
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/nep858

碩士 === 國立聯合大學 === 能源工程學系碩士班 === 107 === The performance of commercial 66 wt%Ni/SiO2-Al2O3 and 5 wt% Ru/Al2O3 and 5 wt% Ru/C catalysts for CO2 methanation at a miniature tubular fixed-bed reactor is investigated experimentally. The inlet flow rate is 20 ml/min with mixture of 20% CO2 and 80% H2. The catalyst loading is 0.2 g. The reactor temperature is controlled in a furnace. The results show that at lower temperature the CO2 conversion for both Ni/SiO2-Al2O3 and Ru/Al2O3 catalysts is quickly increased with the increasing temperature. At higher temperature it falls down slowly with the increasing temperature. The Ni/SiO2-Al2O3 catalyst generally shows better performance, and its CO2 conversion can reaches a maximum CO2 conversion of 92% at 300°C, while it is 82% at 350°C for Ru/Al2O3 catalyst. The lower CO2 conversion of the Ru/C catalysts so it is not a good choice for the CO2 methanation. The CO can be produced via reverse water gas shift reaction. The CO concentration is negligible at lower temperature for both Ni/SiO2-Al2O3 and Ru/Al2O3 catalysts, and it is increased with the increasing temperature when temperature is higher than 450°C.