含CO2合成气低温合成甲醇的研究

以含CO₂的合成气为原料，Cu-Zn基催化剂，醇溶剂，低温、低压（443 K、3.0 MPa）下合成甲醇。考察了时间、溶剂和催化剂对反应的影响。结果表明，随着反应时间的增加，碳的总转化率、甲醇选择性及收率均逐渐增加；醇溶剂参与反应，但并不被消耗，起到助催化作用，且2-丁醇溶剂表现出较高的反应活性；ZnO、Y₂O₃、La₂O₃、MgO和Al₂O₃作为载体制得的Cu/M_xO_y催化剂，Cu/ZnO呈现出较高的反应活性；稀土元素La作为助剂，能提高Cu-Zn基催化剂的活性，当使用n(Cu)∶n(Zn+La)=1∶1，且n(Zn)∶n(La)=3∶2的Cu/ZnO/La2O3催化剂进行甲醇合成反应时，碳总转化率、甲醇的选择性和收率均高于Cu/ZnO催化剂。

Study on low-temperature synthesis of methanol from syngas containing CO2

Methanol was synthesized over Cu-Zn-based catalysts at low-temperature and low-pressure （443 K，3.0 MPa） from syngas containing CO₂ using alcohol solvent. The effects of reaction time, solvent and catalysts were investigated. The results showed that overall carbon conversion, selectivity to methanol and yield increased with reaction time. The alcohol solvent participated in the reaction as a co-catalyst without consumption, and 2-butanol solvent exhibited higher activity. Cu/ZnO catalyst exhibited the higher activity of all Cu/MxOy catalysts prepared using ZnO, MgO, Al₂O₃, La₂O₃ and Y₂O₃ as the carriers. Activity of Cu-Zn-based catalysts was enhanced by doping of rare-earth metals, with higher overall carbon conversion, selectivity to methanol and methanol yield over Cu/ZnO/La₂O₃ catalyst with Cu/(Zn+La) molar ratio of 1∶1 and Zn/La molar ratio of 3∶2.