Co2 Hydrogenation to Methanol on Cu-Zno/Allao with High Activity and Hydrothermal Stability

Abstract

CO2 hydrogenation to methanol can reduce CO2 emissions, meanwhile, the prepared methanol can be used as chemical raw material and fuel, and the catalyst Cu-ZnO/Al2O3 exhibits good activity. Nevertheless, the activity and selectivity over the Cu-ZnO/Al2O3 still need improvement for industrialization. In addition, plenty of water will be generated during CO2 hydrogenation, which causes deactivation of the catalyst due to the hydrothermal environment in the reaction. To increase the activity and hydrothermal stability, La2O3 was added into the catalyst Cu-ZnO/Al2O3, and it endowed the catalyst with strong surface basicity and improved the interface structure of Cu and supporter, which improved the adsorption of CO2 and inhibited the adsorption of methanol, and then increased the catalytic activity and selectivity. More importantly, various characterization technologies for the structures and surface properties over fresh and hydrothermal treatment catalysts showed that the La2O3 added into the catalyst greatly improved the hydrothermal stability.

Keywords: Cu-ZnO, La2O3, CO2, Hydrogenation, Methanol, Hydrothermal stability