Catalytic performances of the CO2 reforming of toluene on Co/Mg O catalysts with different cobalt loadings were evaluated in a fluidized-bed reactor. The results showed that the conversion of toluene and the stability of Co/Mg O increased, but the apparent reaction rate decreased at the initial stage with increasing the amount of metallic Co formed from the reduction of Co/Mg O catalysts at 700°C. The deactivation of Co/Mg O catalysts was mainly resulted from that a part of the metallic Co was oxidized by CO2 and could not be re-reduced by H2 at reaction temperature. Therefore, the excess metallic Co on the higher Co loading catalysts was beneficial to the catalyst stability. Catalytic performances of the CO2 reforming of toluene on Co / Mg O catalysts with different cobalt loading were as evaluated in a fluidized-bed reactor. The results showed that the conversion of toluene and the stability of Co / Mg O increased, but the apparent reaction rate decreased at the initial stage with increasing the amount of metallic Co formed from the reduction of Co / Mg O catalysts at 700 ° C. The deactivation of Co / Mg O catalysts was due to from a part of the metallic Co was oxidized by CO2 and could not be re-reduced by H2 at reaction temperature. Thus, the excess metallic Co on the higher Co loading catalysts was beneficial to the catalyst stability.