Abstract
Systems of Gadolinia-doped ceria (GDC) supported nickel and bismuth were prepared as catalysts for a study of steam reforming of methane (SRM) reaction. Catalysts were made by co-impregnation and two-step impregnation methods, the reaction temperature is between 700 ℃ to 850 ℃. These systems were characterized by Brunauer Emmett teller(BET) surface area test and steam reforming reaction of methane. The surface area was found to decrease with a increase of metal loading, bismuth especially, and catalysts were made by co-impregnation method exhibited higher surface area than two-step impregnation method. Adding bismuth to GDC promotes both CO oxidation and methane activities, catalysts were made by two-step impregnation method especially. The CO2 selectivity increases proportion to bismuth contents but decreases proportion to reaction temperature. In this study, the CO2 selectivity maintains about 95% at the high temperature 850℃.