(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.