Synthesis of natural gas from CO methanation over SiC supported Ni–Co bimetallic catalysts

A series of SiC supported bimetallic Ni–Co catalysts with different Ni/Co ratios was investigated for CO methanation reaction. Compared with monometallic Ni- and Co-based catalysts, the bimetallic Ni–Co catalysts showed higher methanation activity and the Ni/Co ratios significantly affected the methanation activity. The highest activity was obtained over 6Ni4Co/SiC bimetallic catalyst, which also showed excellent stability during the methanation reaction. Further characterizations revealed that the surface enrichment of metal components occurred on the bimetallic catalysts. The interaction between Ni and Co and higher metal dispersion might improve the adsorption and activation of CO and thus enhance the methanation activity of the bimetallic catalysts.

A series of SiC supported Ni–Co bimetallic catalysts with different Ni/Co ratios was prepared and their catalytic performance was investigated for CO methanation reaction in a stream flow of H2/CO = 3. Compared with monometallic catalysts, the bimetallic catalysts showed higher activities and the Ni/Co ratio influenced the methanation activity significantly.Figure optionsDownload as PowerPoint slideHighlights
► The bimetallic catalysts show higher methanation activities than monometallic ones.
► The Ni/Co ratio influence the methanation activities significantly.
► 6Ni4Co/SiC is very stable for CO methanation reaction.
► Ni–Co alloy has been observed in the bimetallic catalysts.
► The synergetic effect between Ni and Co can improve the activity of 6Ni4Co/SiC.