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由浸渍法和沉淀法制备了两个系列的 Ni/γ-Al2 O3甲烷化催化剂 ,应用程序升温还原( TPR)对催化剂进行了表征 ,测定了催化剂的 CO甲烷化活性及抗硫性 .考察了 Mo及稀土( La、Ce)助剂对不同方法制备的 Ni基甲烷化催化剂的活性、抗硫性和表面结构的影响 .结果表明 ,Mo助剂的加入对两种方法制备的 Ni基催化剂的甲烷化活性、选择性及抗硫性都有所促进 :Ni基催化剂中加入 1 0 % Mo助剂 ,程序升温还原过程中还原速度最快 ,具有最佳的甲烷化选择性 ;Ni基甲烷化催化剂的抗硫性随助剂 Mo含量的增加而增强 ;沉淀法制备的催化剂的抗硫性能更佳 ;稀土 ( La、Ce)助剂的加入对甲烷化活性没有显著影响 ,但对抗硫性能有一定的改善
Two series of Ni / γ-Al 2 O 3 methanation catalysts were prepared by impregnation method and precipitation method. The catalysts were characterized by temperature programmed reduction (TPR) and the CO methanation activity and sulfur resistance of the catalysts were measured. Mo and rare earth (La, Ce) additives on the activity, sulfur resistance and surface structure of Ni-based methanation catalysts prepared by different methods.The results show that the addition of Mo promoter to the Ni-based catalyst prepared by two methods Methanation activity, selectivity and anti-sulfur are promoted: Ni-based catalyst by adding 10% Mo promoter, the reduction temperature reduction process fastest, with the best methanation selectivity; Ni methanation The sulfur resistance of the catalyst increased with the increase of the additive Mo. The catalyst prepared by the precipitation method showed better sulfur resistance. The addition of rare earth (La, Ce) additives had no significant effect on the methanation activity, but the sulfur resistance Certain improvement