钼和镧是好的镍硼触媒的促进剂,对于对氯硝基苯氢化反应有好的效果,因此同时加入钼和镧在镍硼触媒上应该是有趣的研究题目.本研究利用化学还原法制备了一系列含有不同量镧的镧钼镍触媒,醋酸镍、钼酸胺及硝酸镧同时加入含有甲醇的水溶液中.以X光绕射,穿透式电子显微镜、高分辨率电子显微镜及X光光电能谱仪鉴定了这些触媒.对氯硝基苯氢化反应是在批次反应器中于333 K、1.2 MPa氢气压力及500 r/min转速下操作.即使在镍钼硼中加入很少量的镧,对提高活性及对氯苯胺的选择性都有显著的效果,加入适量的镧可以抑制镍钼硼的长范围的结晶排列,并保持镍钼硼在非结晶状态.镧以氧化态存在,其功效为阻隔物,避免镍钼硼聚集,但是过量的镧会有相反的效果,镧和镍的适当比例是0.2.
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