The Fe-catalyzed Fischer-Tropsch (FT) reaction constitutes the core of the coal-to-liquids (CTL) process, which converts coal into liquid fuels. Conventional Fe-based catalysts typically convert 30% of the CO feed to CO₂ in the FT unit. Decreasing the CO₂ release in the FT step will reduce costs and enhance productivity of the overall process. In this context, we synthesize phase-pure ε(')-Fe₂C catalysts exhibiting low CO₂ selectivity by carefully controlling the pretreatment and carburization conditions. Kinetic data reveal that liquid fuels can be obtained free from primary CO₂. These catalysts displayed stable FT performance at 23 bar and 235°C for at least 150 hours. Notably, in situ characterization emphasizes the high durability of pure ε(')-Fe₂C in an industrial pilot test. These findings contribute to the development of new Fe-based FT catalysts for next-generation CTL processes.

中文翻译：

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稳定且低CO2选择性的ε-碳化铁费-托催化剂的合成。

铁催化的费-托反应（FT）构成了煤制油（CTL）工艺的核心，该工艺将煤转化为液体燃料。常规的铁基催化剂通常在FT单元中将30％的CO进料转化为CO ₂。减少FT步骤中的CO ₂释放量将降低成本并提高整个过程的生产率。在这种情况下，我们通过仔细控制预处理和渗碳条件，合成了具有低CO ₂选择性的纯相ε（'）-Fe ₂ C催化剂。动力学数据表明，可以从初级CO _2中获得液体燃料。这些催化剂在23 bar和235°C下显示至少150小时的稳定FT性能。值得注意的是，原位表征强调了在工业试验中纯ε（'）-Fe ₂ C的高耐久性。这些发现有助于开发用于下一代CTL工艺的新型铁基FT催化剂。