1)To prepare graphene oxide, reduced graphene oxide using modified-Hummers method, and to use the obtained graphene as a support for deposition of Cu/ZnO based catalysts.
2)To investigate the effect of loading methods (impregnation and co-precipitation) and loading amount of graphene on physicochemical properties of the Cu/ZnO-loaded graphene catalysts as well as the catalytic performance for CO2 hydrogenation to methanol.
3)To investigate the effect of cobalt (Co) and iron (Fe) addition on the physicochemical properties of the modified catalysts as well as the catalytic performance for CO2
