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用程序升温还原方法合成了Cu-Ni/γ-Al2O3催化剂,使苯直接羟基化合成苯酚。对该反应过程中,反应温度、反应溶剂、反应原料的不同配比等因素的影响进行了探讨。采用H2-TPR、XRD等技术考察了CuO、NiO的还原状态,确定了最佳还原温度和最佳反应条件:在350℃的还原温度下,当反应温度为70℃、水为反应溶剂、n(H2O)∶n(C6H6)=40∶1、n(H2O2)∶n(C6H6)=5∶1时,苯转化率为36.2%,苯酚选择性为86.3%,苯酚收率为31.2%。
Cu-Ni / γ-Al2O3 catalysts were synthesized by temperature-programmed reduction method, and the direct hydroxylation of benzene to phenol was carried out. The reaction process, the reaction temperature, the reaction solvent, the different ratio of raw materials and other factors were discussed. The reduction state of CuO and NiO was investigated by H2-TPR and XRD. The optimum reduction temperature and optimum reaction conditions were determined. When the reaction temperature was 70 ℃ and water was the reaction solvent at 350 ℃, n The conversion of benzene was 36.2%, the selectivity to phenol was 86.3%, and the yield of phenol was 31.2% when the molar ratio of (H2O): n (C6H6) = 40:1 and n (H2O2): n (C6H6) = 5:1.