制备因素对Ni/C催化剂上乙醇气相羰基化反应性能的影响

采用等体积浸渍法制备负载型Ni/C催化剂，考察了制备因素对乙醇直接气相羰基化反应的影响。实验结果表明，催化剂最佳制备因素为，Ni的质量分数为5%，活性炭采用水洗预处理，控制浸渍液的pH值为8.0～9.0，焙烧温度为450℃，H₂还原温度为400℃。采用上述参数制备的Ni/C催化剂，其乙醇转化率和丙酸选择性分别为96.14%和95.71%。利用N₂物理吸附法研究载体预处理对催化剂比表面积、孔容及孔径的影响和X射线衍射法(XRD)研究了活性组分在惰性气氛中焙烧时的分散状况。

Effects of preparation conditions on the catalytic performance of Ni/C for vapor phase carbonylation of ethanol

The catalyst nickel supported on active carbon (Ni/C) was prepared by isometric wetness impregnation method and characterized by BET and XRD measurement. The effects of preparation conditions on the performance of the Ni/C catalyst for vapor phase carbonylation of ethanol were investigated. The results showed that the catalytic performance of Ni/C is strongly influenced by the preparation conditions; the optimum preparation conditions are: Ni loading of 5%, pretreatment of active carbon with water, pH value...