CuO/Bi2O3催化合成3-己炔-2,5-二醇

采用均匀沉淀法在水热体系中制备出CuO/Bi2O3粉体催化剂,讨论了水解过程中pH对生成晶形沉淀的影响,通过TG分析确定合适的焙烧温度。采用XRD、SEM、BET等技术对催化剂进行了表征,结果表明,在400℃下焙烧可得到晶形完善,比表面积较大,平均尺寸0.1～0.5μm的粉体颗粒。在高压反应釜中考察了Bi质量分数、反应温度、乙炔分压、pH对催化活性的影响,得到了催化合成3-己炔-2,5-二醇的适宜反应条件:Bi质量分数12%,反应温度120℃,乙炔分压1.0 MPa,pH=6～7,产物收率达20.10%。

The synthesis of 3-Hexyne-2,5-diol with CuO/Bi2O3 catalyst

The particle catalyst CuO/Bi2O3 was prepared by homogeneous precipitation in the hydrothermal system.The effect of hydrolysis pH on the crystalline precipitate was studied and the optimal calcination temperature was ascertained through TG analysis results.The structure,morphology and specific surface area of the particles were characterized by means of XRD,SEM and BET techniques,and the results show that powder particles of a average size of 0.1～0.5 μm with perfect crystal,larger surface area could be obtained when the calcination temperature was 400 ℃.It was proved that the compound oxide catalyst CuO/Bi2O3 had a good catalytic effect on the ethynylation reaction.Factors affecting its catalytic activity,such as Bi mass fraction,reaction temperature,partial pressure of acetylene,and pH of solution,were studied,and 3-hexyne-2,5-diol of a yield of 20.10% was obtained under the optimized reaction conditions:Bi mass fraction 12%,temperature 120 ℃,pH=6～7,acetylene partial pressure 1.0 MPa.