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采用共沉淀法、浸渍法和沉积沉淀法制备了CeO2-Al2O3复合载体,比较了不同复合载体浸渍钴钼后的耐硫甲烷化催化性能,并优化了复合载体中CeO2的含量。结合N2物理吸附、XRD、H2-TPR等表征手段对复合载体及其负载的钴钼催化剂进行物相和结构分析发现,在Al2O3中添加CeO2可以明显提高合成气的耐硫甲烷化活性,其中,沉积沉淀法制备的25%CeO2-Al2O3复合载体负载钴钼后具有最佳催化活性。
CeO2-Al2O3 composite carrier was prepared by coprecipitation method, impregnation method and deposition precipitation method. The catalytic activity of sulfur-tolerant methanation after cobalt-molybdenum impregnated with different composite carriers was compared and the content of CeO2 in the composite carrier was optimized. The phase and structure analysis of the composite support and its cobalt-molybdenum catalyst by N2 adsorption, XRD, H2-TPR and other means showed that the addition of CeO2 to Al2O3 can significantly increase the sulfur-tolerant methanation activity of the synthesis gas, The 25% CeO2-Al2O3 composite carrier deposited by precipitation method has the best catalytic activity after supporting cobalt molybdenum.