The design of lower-cost alternative heterogeneous catalysts for the hydrogenation of halogenated nitrobenzenes using green method to synthesize the corresponding anilines is highly desirable. In this study, Ag was incorporated into the Co-MOFs during the growing process (Co-Ag(n)-MOFs), and then followed the carbothermal reduction process without any additional procedures, we synthesized a series of Co-Ag(n)@NCs. The self-supported catalysts exhibited excellent and stable catalytic performances for the chemoselective hydrogenation of halogenated nitrobenzenes without obvious dehalogenation. The Co-Ag bimetallic alloy nanoparticles were well-dispersed and protected from aggregation and leaching by the porous nitrogen doped carbon. Besides, either hydrazine hydrate (N₂H₄·H₂O, generating byproducts N₂ and H₂O) or H₂ could be used as green reducing agent with excellent selectivity towards synthesizing the corresponding anilines. And when the Co/Ag content ratio was approximate 1:1, the Co-Ag(1:1)@NC showed the best catalytic performance. Moreover, the Co-Ag(1:1)@NC could be efficiently recovered by using an external magnetic force and reused without obvious decrease of catalytic activity. Thus, such highly efficient, inexpensive, stable and magnetically recyclable catalysts could show great potentials in practical applications for many important reactions.

迫切需要设计成本低廉的，可替代的非均相催化剂，以绿色方法合成卤代硝基苯，以合成相应的苯胺。在这项研究中，Ag在生长过程（Co-Ag（n）-MOFs）中被掺入到Co-MOFs中，然后在不进行任何其他程序的情况下遵循碳热还原过程，我们合成了一系列Co-Ag（n） @NCs。自负载催化剂对卤代硝基苯的化学选择性加氢表现出优异而稳定的催化性能，且无明显的脱卤作用。Co-Ag双金属合金纳米粒子分散良好，并通过多孔氮掺杂碳保护其免于聚集和浸出。此外，水合肼（N ₂ H ₄ ·H_在2 O中，生成副产物N ₂和H ₂ O）或H ₂可以用作绿色还原剂，对合成相应的苯胺具有优异的选择性。当Co / Ag含量比约为1：1时，Co-Ag（1：1）@NC表现出最佳的催化性能。而且，通过使用外部磁力可以有效地回收Co-Ag（1：1）@NC，并且可以在不明显降低催化活性的情况下对其进行再利用。因此，这种高效，廉价，稳定和可磁循环的催化剂在许多重要反应的实际应用中可能显示出巨大的潜力。