Effect of Gold Nanoparticles Addition to CuO-ZnO/Al2O3 Catalyst in Conversion of Carbon Dioxide to Methanol

摘要

Hydrogenation of carbon dioxide (CO2) into methanol (CH3OH) was carried out in the CuO-ZnO based supported gold catalyst prepared by the co-precipitation method. When gold nanoparticles were added to the CuO-ZnO/Al2O3 catalysts (CuO-ZnO/Au/Al2O3), the CO2 conversion and CH3OH yield were increased (two times higher than that of CuO-ZnO/Al2O3 catalyst) with increasing reaction pressure, but selectivity of CH3OH was decreased. The main reason of this result could suggest the importance gold-oxides interface in CH3OH formation through hydrogenation of CO2. Maximum selectivity and yield to CH3OH over CuO-ZnO/Au/Al2O3 were obtained at 250 degrees C and under 15-20 bars.