Preparation And Evaluation Of Copper-based Catalyst For Methanol Synthesis Via CO₂ Hydrogenation

Methanol is an important organic chemical mateiral,which is the basis of Cl chemical industry and also is a fine organic solvent and liquid fuel,and also is one kind of substitute power fuels for automobiles in the future.The chemical process of methanol synthesis from CO2 + H2 is significant not only in protecting and improving the global environment through fully utilizing natural carbon resources and industrial CO2 waste, but also in solving the increasingly serious problem of energy crisis.The particle Cu/ZnO/A12O3 and Cu/ZnO/ZrO2 catalysts with different CuO/ZnO ratio were prepaerd by coprecipitation method. Carbon-coated nano-metal catalysts for methanol synthesis from CO2 hydrogenation were prepared. The structure and surface properties of the catalysts were characterized by various modem analysis methods, such as BET,TPR,XRD.The effect of CuO/ZnO ratio and reaction temperature and reaction pressure and space velocity on catalytic activity and selectivity was studied, respectively catalysts for methanol synthesis from CO2 hydrogenation have been investigated systemically and some new conclusions have been drawn.It was found that at the same reaction conditions,the Cu/ZnO/A12O3 catalysts with the Cu/Zn molar ratio of 4.5/4.5 had the highest reactivity. One-round selectivity of methanol was 43.51 % and one-round yield of methanol was 7.21 %.In the Cu/ZnO/ZrO2 catalyst, when the Cu/Zn molar ratio was 5/4, it had the highest reactivity, one-round selectivity of methanol was 47.29 %, space-time yield reached 8.51 %.In Cu-Zn-coated carbon nano-metal catalyst, when the Cu/Zn molar ratio was 1.25/1, it had the highest reactivity. One-round conversion ratio of CO2 was 4.03 %, methanol selectivity reached to 38.81 % and space-time yield of methanol was 1.56 %. The order of activity of methanol synthesis via CO2 hydrogenation was carbon-coated Cu-Zn catalysts