(576e) Effect of MoO3 on Catalytic Performance and Stability of the SBA-16 Supported Ni Catalyst for CO Methanation

 A series of Ni/SBA-16 and NiMo/S16 catalysts were prepared by the impregnation methods and their performance on synthetic natural gas (SNG) production were systematically investigated in a continuous flow fixed-bed reactor. Coexistence of MoO₃ in Ni-catalysts resulted in forming uniformly sized Ni particles and better heat-resistant performance because of the large surface area of SBA-16 supports and the strong interaction between Ni and SBA-16, while high MoO₃(>3%) content will reduce the activity because of the partial coverage of nickel. Adopting the Mo-Ni impregnation sequence can significantly improve the activity of catalyst due to the moderate interaction between nickel and support and the electron transfer from MoO₃ to Ni species. Ni-Mo/S16(1%) achieves the best activity with 100% CO conversion and 97% CH₄ selectivity and yield at 350°C, 0.1MPa, and15000mL/g/h. The activity of Ni-Mo/S16(1%) remain stable after calcination in reactant gases at 700°C and during a 100 h reaction period. The deactivation of the catalyst was proved to be the carbon deposition on the catalysts and the addition of MoO₃ can significantly inhibit the carbon deposition, which were confirmed by XRD and TG results. These results will be helpful to design high efficient Ni-based catalysts for CO methanation reaction and provide scientific understanding to this reaction.