A series of Fe/h-BN catalysts promoted with Cu or Mn were prepared for Fischer-Tropsch synthesis (FTS). The physicochemical properties, crystal structures and morphologies of the catalysts were characterized by N₂ physisorption, FT-IR, TPR, XPS, XRD, MES and TEM. It is found that iron oxide nanoparticles are highly dispersed on h-BN matrix due to the anchoring effect of surface defects and the accommodation of porous structures of h-BN. The characterization results indicate that strong interaction between iron oxide and h-BN is present on un-promoted catalyst, which endows the h-BN supported iron catalyst with stable properties under FTS conditions but severely retards reduction of the catalyst. The addition of Cu to Fe/h-BN can to some extent overcome the strong interaction by introducing more sites for dissociating H₂. It is observed that Cu promoter can increase the reduction or carburization degree and thus enhance the FTS activity. The addition of Mn to Fe/h-BN can weaken the strong interaction by altering the electron structure of iron species. And the electron-rich Fe species are responsible for easy reduction and the enhanced FTS performance. Besides, a higher activity can be realized by co-adding Cu and Mn to the Fe/h-BN catalyst. These results suggest that the synergistic effect of Mn and Cu can largely improve the performance of Fe/h-BN catalyst without impairing the stability of the catalyst. The present study paves a way to tailor the performances of FTS catalysts with h-BN as support.

制备了一系列用Cu或Mn促进的Fe / h-BN催化剂用于费-托合成（FTS）。用N ₂表征了催化剂的理化性质，晶体结构和形貌。物理吸附，FT-IR，TPR，XPS，XRD，MES和TEM。发现由于表面缺陷的锚固效应和h-BN的多​​孔结构的容纳，氧化铁纳米颗粒高度分散在h-BN基质上。表征结果表明，未促进的催化剂上存在氧化铁与h-BN之间的强相互作用，这使h-BN负载的铁催化剂在FTS条件下具有稳定的性能，但严重阻碍了催化剂的还原。通过在Fe / h-BN中添加Cu可以通过引入更多的H ₂分解位点来克服强相互作用。。观察到Cu促进剂可以增加还原度或渗碳度，从而增强FTS活性。在Fe / h-BN中添加Mn可以通过改变铁物种的电子结构来减弱强相互作用。富电子的Fe物种具有易于还原和增强FTS性能的作用。此外，通过将Cu和Mn共添加到Fe / h-BN催化剂中可以实现更高的活性。这些结果表明，Mn和Cu的协同作用可以在不损害催化剂稳定性的情况下极大地提高Fe / h-BN催化剂的性能。本研究为以h-BN为载体调整FTS催化剂的性能铺平了道路。