A series of CoxMn0.06/SiO2 catalysts, which were used for the synthesis of light hydrocarbons from CO hydrogenation, were prepared. The effects of reaction temperature, the morphological and structural properties of the catalysts on the CO conversion and product selectivity were examined. The results show that both CO conversion and C2 to C4 hydrocarbon selectivity are significantly affected by the amount of Co loaded onto the catalysts. The optimum Co content was determined to be 10 wt% (i.e., for Co0.10Mn0.06/SiO2) catalyst, and corresponding CO conversion and the selectivity to C2 to C4 hydrocarbons are 95.3 and 80.6%, respectively, at 400 degrees C.