Effect of Mo Addition on the Performance of Ni-Based Methanation Catalysts Supported by Halloysites

Ni-based halloysite methanation catalysts with variousMo contentswere prepared by using halloysites as supports, and it was used tocatalyze the methanation reaction. The addition of Mo can strengthenthe interaction between Ni and the halloysite, preventing the activecomponent Ni from aggregating into the larger particles during thereaction, which can improve the catalyst activity and life. At thesame time, the electron donation of the Mo atom can rise the electrondensity around the nickel atom and facilitate the dissociation ofcarbon monoxide on the Ni surface, which can improve the activityof the reaction under low temperature. Among them, the 6Mo10Ni/eHNTscatalyst has the best activity at 350 & DEG;C. The conversion of COachieves 100% and the yield of CH4 reaches 99.7%. At 300 & DEG;C, the CO conversion rate is 100%, and the CH4 yieldis 97%, which is the same as the activity of 10Ni/eHNTs without Moat 350 & DEG;C, i.e., the low temperature activity is improved withthe addition of Mo. At the same time, the addition of Mo enhancesthe anti-sintering property and resistance to the carbon depositionof the catalysts. This work shows the possibility for the industrialapplication of the methanation catalyst using halloysites as the support.