The conversion of natural gas(methane) to syngas (reforming reaction) is regarded as alternative routes for production of great value compounds, such as synthetic liquid fuels and oxygenated compounds. The aim of this work is to investigate the highest activity catalyst among 30 catalyst candidates which consists of Ni-M [M (promoter) = Co, Fe, Ce] on gamma-Al(2)O(3), by combinatorial method for autothermal reforming. The catalyst candidates with different M/Ni molar ratio were prepared by the impregnation method. The consistent results were found between 32 channel reactors and single fixed bed reactor. It was found that the best catalyst is 5.54 wt%Ni-13.3wt% Ce/gamma-Al(2)O(3).