CO2 hydrogenation to methane over Co/KIT-6 catalysts: Effect of Co content

The ordered mesoporous Co/KIT-6 catalysts with different Co loading (15–30 wt%) were prepared by impregnation method for CO2 hydrogenation. The physicochemical properties of the catalysts were characterized by H2-TPR, XRD, BET, H2-TPD, and CO2-TPD. The results show that the crystal size of Co species increases with the increasing Co content and the dispersion of Co species reveals an opposite trend. The adsorption capacities of H2 and/or CO2 molecules achieve a maximum value at the Co loading of 25 wt%. The CO2 reaction rate and CH4 selectivity are in the following order: Co15