Abstract Superior iron-based Fischer-Tropsch synthesis (FTS) catalysts (Fe/NMCs) were developed by impregnating high amount of iron (40 wt%) over nitrogen-rich mesoporous carbons (NMCs) with high porosities. The large pore volumes and specific surface areas of NMCs realized the high loadings and proper dispersions of iron while the nitrogen-containing groups enhanced the basicities of the catalysts. Weak metal-support interactions were observed in Fe/NMCs, which improved the reduction, carburization of iron, and further the FTS activities. FTS tests indicated a medium amount of nitrogen (≤8.3 wt%) did not show obvious effect on the activity of the catalyst, but a much higher amount of nitrogen (≥16.5 wt%) could result in a significant decrease of activity. Nitrogen-containing groups could effectively suppress the methane selectivity and improve the lower olefins selectivity in the FTS reaction. The hydrocarbon productivity of the Fe/NMCs was up to 0.62 g HC/(h·g cat.) at 260 °C, 1 MPa, and H2/CO ratio of 1, much higher than that of any other iron catalyst reported under similar conditions. As a result of the superior performance, Fe/NMCs could be one of ideal candidates for iron-based FTS catalysts in the future.

中文翻译：

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富氮介孔碳负载铁催化剂，具有优异的费托合成活性

摘要 通过在具有高孔隙率的富氮介孔碳 (NMC) 上浸渍大量铁 (40 wt%)，开发了优质的铁基费托合成 (FTS) 催化剂 (Fe/NMC)。NMCs的大孔体积和比表面积实现了铁的高负载和适当的分散，而含氮基团增强了催化剂的碱性。在 Fe/NMCs 中观察到弱金属-载体相互作用，这改善了铁的还原、渗碳，并进一步提高了 FTS 活性。FTS 测试表明，中等量的氮（≤8.3 wt%）对催化剂的活性没有明显影响，但更高的氮量（≥16.5 wt%）会导致活性显着降低。含氮基团可以有效抑制甲烷选择性，提高FTS反应中低级烯烃的选择性。Fe/NMCs 在 260 °C、1 MPa 和 H2/CO 比为 1 时的烃生产率高达 0.62 g HC/(h·g cat.)，远高于类似条件下报道的任何其他铁催化剂的产率。使适应。由于其优异的性能，Fe/NMCs 可能成为未来铁基 FTS 催化剂的理想候选者之一。