xCe(100-x)MnOx(x=0％,10％,30％,50％,80％,and 100％,respectively),a series of composite oxides,are prepared via the redox precipitation method.Ni/CeMnOx series catalysts are then prepared by loading Ni onto xCe(100-x)MnOx through the impregnation method.The dry reforming reaction of CH4 to syngas is served as a model reaction to study the influence of the mass ratio of Ce/Mn on the activity of Ni/CeMnOx catalysts.It is found that the addition of Ce additives into Ni/MnOx catalysts increases the specific surface area and the number of surface basic sites,as well as improves the reduction ability of the catalysts.Additionally,Ce addition improves the catalysts'reduction ability.In the Ni/CeMnOx series catalysts,the mass ratio of Ce to Mn significantly impacts the reaction activity.The higher Ce mass fraction is beneficial for enhancing the conversion rates of CH4 and CO2.Notably,at 700℃and V(CH4)/V(CO2)=1:1,the conversion rates of CH4 and CO2 over Ni80Ce20Mn catalyst are relatively high,73.90％and 79.38％,respectively.
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