| There are some advantages for the slurry bed reactor:high heat-transfer coefficient, high stability and so on. The catalysts sintering and losing activity could be reduced or avoided by using the slurry bed reactor in methanation production. And the process of reactor was well stability. The catalyst of nickel based on silica for methanation in slurry bed reactor was prepared in this paper. The results show that the catalyst calcinated at among450-550℃and reduced at550℃could improve nickel distribution on support and catalytic activity. The γ-Al2O3is very well promoter in methanation catalyst, and it could increase the selectivity of methane. The promoter research also showed that rare-earth element improved the CO conversion and the selectivity of methane, and Mo promoter reduced the catalytic results without sulfur. The process conditions of the catalyst were also studied, and the optimized conditions are that, the reaction temperature was at290℃or300℃, H2/CO were equal to3:1or3.5:1. The pressure had little effect, and2MPa was used in the paper. High gas-speed could reduce the CO conversion per pass and increase the reaction rate. |
