In this work, by the simple pyrolysis of Fe²⁺, Co²⁺ or Ni²⁺ and 1,10-phenanthroline (Phen) complexes under the presence of activated carbon and dicyandiamide in nitrogen atmosphere, different nonprecious transition metal-based species that well confined in nitrogen doped carbon (M-N-C, M = Fe, Co or Ni) were prepared. The Fe-N-C showed the best catalytic performance for the transfer hydrogenation of halogenated nitrobenzenes. More importantly, through the catalytic results comparison of the three catalysts estimated by gas chromatography-mass spectrometer, two speculations might be presented for the reaction pathway depending on the catalyst used. The transfer hydrogenation reaction route over Fe-N-C might follow the indirect way like the Co-N-C and Ni-N-C. Another assumption was the Fe-N-C might go through the direct pathway in contrast to the Co-N-C and Ni-N-C which resulted in formation of azoxybenzene and azobenzene intermediates before complete conversion to aniline. Those differences were found to be correlated with the different valence states and active metal components in different catalysts. In addition, the optimal Fe-N-C could be efficiently recovered by using an applied magnetic field and reused without significant decrease of activity. Therefor the catalyst may possess important potential for the industrial application in the selective hydrogenation of halogenated nitrobenzenes.

在这项工作中，通过Fe 2 ⁺，Co ²⁺或Ni ²⁺的简单热解和在氮气氛下在活性炭和双氰胺存在下的1,10-菲咯啉（Phen）配合物，制备了不同的非贵金属过渡金属基物质，它们被很好地限制在氮掺杂的碳中（MNC，M = Fe，Co或Ni）。Fe-NC对卤代硝基苯的转移氢化显示出最佳的催化性能。更重要的是，通过对气相色谱-质谱仪估计的三种催化剂的催化结果进行比较，根据所用催化剂的不同，反应路径可能会出现两种推测。Fe-NC上的转移加氢反应路线可能遵循间接方式，如Co-NC和Ni-NC。另一个假设是，与Co-NC和Ni-NC相比，Fe-NC可能会通过直接途径，从而导致在完全转化为苯胺之前形成了乙氧基苯和偶氮苯中间体。发现这些差异与不同催化剂中不同的化合价态和活性金属组分有关。另外，可以通过施加磁场有效地回收最佳的Fe-NC，并在不显着降低活性的情况下对其进行再利用。因此，该催化剂在卤代硝基苯的选择性加氢中具有工业应用的重要潜力。最佳的Fe-NC可以通过施加磁场有效地回收并在不显着降低活性的情况下重复使用。因此，该催化剂在卤代硝基苯的选择性加氢中具有工业应用的重要潜力。最佳Fe-NC可以通过施加磁场有效地回收，并在不显着降低活性的情况下重复使用。因此，该催化剂在卤代硝基苯的选择性加氢中具有工业应用的重要潜力。