The main factors controlling generation of synthetic natural gas by methanation of synthesis gas in the presence of sulfur-resistant Mo-based catalysts

摘要

The Co-Mo-Al and Co-Mo-Ce-Al catalysts were prepared and tested for their activity in the methanation of synthesis gas in the presence of hydrogen sulfide. The results showed that the Co-Mo-Ce-Al series was superior to the Co-Mo-Al system in terms of CO conversion. The former system was used to examine the main factors controlling the methanation behavior. Among these are: H _2S concentration in the reaction mixture, reaction temperature and pressure, concentrations of CO_2, CH_4, and H_2O, H_2/CO ratio, and gaseous hourly space velocity. The methanation activity increased with increasing temperature, pressure and H_2/CO ratio. The reason why adding CO_2 or H_2O decreases the methanation activity is discussed.