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用冶金法、还原扩散法、共沉淀法制得了LaNiFe,并对其催化合成氨反应性能进行了研究。实验结果表明:还原扩散法,共沉淀法制得的LaNi_4Fe催化活性均比冶金法好。X—射线分析指出LaNi_4Fe在合成氨反应过程中变为Ni_4Fe和LaN。
LaNiFe was prepared by metallurgical method, reductive diffusion method and coprecipitation method, and its catalytic performance for ammonia synthesis was studied. The experimental results show that the catalytic activity of LaNi 4 Fe prepared by reductive diffusion method and coprecipitation method are better than that of metallurgical method. X-ray analysis indicates that LaNi 4 Fe becomes Ni 4 Fe and LaN during the reaction of ammonia synthesis.