The effects of Ce-ZrOx,Ce-LaOx,Ce-SmOx and Ce-GdOx additions to Rh/Al2O3 catalysts on methane autothermal re-forming were investigated.Activity tests showed that the addition of Ce-ZrOx could significantly reduce the concentration of CO in reformats.When Ce/Zr atomic ratio was 1:1,Ce0.5Zr0.5O2 solid solution with high thermal stability was obtained,which could effectively improve the catalytic performance effectively.The additives of alkaline-earth metals(Mg,K and Ca) on the catalytic properties were also studied.The results of experiments showed that the addition of MgO to Rh/Ce0.5Zr0.5O2/Al2O3 improved the stable performance and the carbon resistance of the catalyst.The optimized catalyst was 0.1%Rh/2.0%MgO/40%Ce0.5Zr0.5O2/Al2O3,which showed a highly stable performance for methane autothermal reforming.
