Effects of Additives on Sturcture and Methanation Performance of Ni-Based Catalysts

Nickel-based catalysts were prepared with different metal promoters by incipient impregnation method,and the catalytic performance of CO methanation were studied in slurry-bed reactor.XRD,H2-TPR,and HR-TEM were used to characterize the catalysts,the results show that additives of Zr,Co,Ce,Zn,La improved the dispersion of Nickel species on support,and decreased the particle size of Ni and reduced the reduction temperature of catalyst,while the additive of Mg increased the reduction temperature.The catalytic results show that additives of Zr,Co,Ce,Zn,La improved the catalytic performance of CO methanation in slurry-bed reactor,especially the catalyst with La additive.Further investigation shows that when the loading of La reached 8%,the catalyst exhibited the best catalytic performance,with the conversion of CO of 96.3%,the selectivity and space-time yield(STY) of CH4 of 87.1% and 179.6 g·kg-1·h-1,respectively.While the catalyst doped with Mg additivie decreased the catalytic performance.