| Methanol is an important organic chemical materials, which is the basis of C1chemical industry, which is also used in medicine, fuel, organic synthesis and so on. The chemical process of metanol synthesis from CO2+H2is significant not only in protecting and improving the global environment through fully utilizing natural carbon resources and industrial CO2waste, but also in solving the increasingly serious problem of energy crisis. The key factors to solve this problem is development of higher efficient catalysts.The CuO/ZnO/ZrO2methanol synthesis catalyst with different Cu/Zn/Zr ratio were prepared by coprecipitation method. The samples were characterized by XRD, BET, H2-TPR and CO2-TPD techniques. Reaction performances of the catalysts were also studied. The effect of Zn/Zr and Cu/Zn ratio on catalytic activity and selectivity was studied. The result showed that the catalysts with the Cu/Zn/Zr molar ratio of0.45/0.45/0.1and0.4/0.2/0.4had the highest reactivity, the yield of methanol was5.66%and5.76%. In addition, the main factors to affect catalyst performance is not the surface area of the catalyst. The grain is smaller, the reduction temperature is lower, the ability of carbon dioxide is better and the reaction performance is better.In order to improve the reaction performance and stabitiy of the catalyst, a certain amount of fertilizer Al2O3is respectively introduced to the catalysts to instead of ZrO2. The effect of Al2O3/ZrCO2quality ratio on catalytic activity and selectivity was studied. It is showed that the Al2O3is respectively introduced to the catalysts which only has the right amount could improve the catalyst reaction performance. When the catalysts with the Cu/Zn molar ratio of0.45/0.45and Al2O3/ZrO2quality ratio of2.4233/12.1167(1/5), The performance of catalyst is further improve, the methanol yield was6.70%; And When the catalysts with the Cu/Zn molar ratio of0.4/0.2and Al2O3/ZrO2quality ratio of6.3274/44.2916(1/7), the methanol yield was6.90%. The yield of methanol was improved about1%. In addition, The preparation of the catalysts were optimized. The effect of the preparation of the catalysts with surfactant CTAB and ultrasonic on catalytic activity and selectivity was studied. It is showed that the surfactant CTAB is respectively introduced to the catalysts which only has the right amount could improve the catalyst reaction performance. The activity of catalysts and the area size of copper surface were closely related, and the surface area of copper depend mainly on its size, the add of surfactant CTAB and ultrasonic can prevent the reunion of particles and control the growth of particles, and improve the catalyst performance. Study showed that when4.5%of the surfactant catalyst quality and ultrasonic were introduced, the yield of methanol was improved about0.8%.Comprehensive known that the (CuO)0.45(ZnO)0.452.4233(Al2O3)12.1167(ZrO2) and (CuO)0.4(ZnO)0.26.3274(Al2O3)44.2916(ZrO2) prepared via the promoted coprecipitation exhibited higher catalytic activity in methanol synthesis. |
