Equilibrium Analyses and Kinetics of Carbon Dioxide Methanation Using an Alumina-Supported Ruthenium Catalyst

摘要

With CO2 being accepted as the main cause of the climate change, considerable efforts currently focus on capturing CO2 from major point sources and to store it. Another, better way is to utilize the captured CO2 to produce useful fuels like methane. The Sabatier reaction was studied in this work, using 0.5 % ruthenium on alumina as catalyst. A quartz reactor packed with catalyst particles and placed in a vertical furnace was employed. A stoichiometric ratio of CO2/H-2 was used and the temperature was changed between 150 and 400 degrees C, while the flow rate of the feed gas mixture was varied between 250 and 625 mL min(-1), with different amounts of catalyst. The temperature was identified as the major parameter affecting the conversion. Carbon dioxide conversions greater than 85 % were obtained at temperatures higher than 350 degrees C.