Fischer-Tropsch synthesis (FTS) targeting liquid fuel products is key technology to alleviate the excessive dependence on unsustainable crude oil. Fabrication of highly active phase has long been an attractive topic in the field of Fischer-Tropsch catalysis. However, as a promising active species, the efficient formation of Fe₂C phase is inhibited by kinetic barrier via traditional approaches. In this context, we firstly synthesized phase-pure Fe₂N nanoparticles on Al₂O₃, which has similar coordination structure with Fe₂C. The in-situ XRD data in time series reveal that pre-existing of interstitial N atoms in Fe₂N structure leads to the effective phase transformation to Fe₂C at low temperatures (280 °C). The as-prepared catalysts demonstrated highly catalytic activity without any induction period, coupling with a high selectivity of 60wt.% for desired valuable products. In addition, the corresponding structural evolution uncover the determining effect of these electron-rich Fe sites in the Fe₂X (N or C) structure on superior performance.

针对液体燃料产品的费托合成（FTS）是缓解过度依赖不可持续原油的关键技术。长期以来，高活性相的制备一直是费-托催化领域中的一个有吸引力的主题。然而，作为有希望的活性物质，Fe的有效形成₂ C相是由动力学屏障抑制经由传统的方法。在此背景下，我们首先在Al ₂ O ₃上合成了相纯的Fe ₂ N纳米粒子，该纳米粒子具有与Fe ₂ C相似的配位结构。按时间序列的原位XRD数据表明，Fe中存在间隙N原子₂N结构通向有效相转变成Fe ₂下在低温（280℃）。所制备的催化剂在没有任何诱导期的情况下显示出高催化活性，并且对所需有价值的产物具有60wt。％的高选择性。另外，相应的结构演变揭示了Fe ₂ X（N或C）结构中这些富电子的Fe位点对优异性能的决定作用。