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首页> 外文期刊>RSC Advances >An Na-modified Fe@C core–shell catalyst for the enhanced production of gasoline-range hydrocarbons via Fischer–Tropsch synthesis
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An Na-modified Fe@C core–shell catalyst for the enhanced production of gasoline-range hydrocarbons via Fischer–Tropsch synthesis

机译：一种Na-改性的Fe @ C核壳催化剂，用于通过Fischer-Tropsch合成增强汽油烃的生产

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摘要

Although numerous studies have been conducted in the field of converting syngas to value-added fuels, selectively converting syngas to gasoline-range hydrocarbons (C _(5–12) hydrocarbons) remains a big challenge. Alkali metal (namely, K, Na and Li)-modified Fe@C core–shell catalysts were synthesized by a one-step hydrothermal method for Fischer–Tropsch synthesis. An optimized selectivity of 56% for the C _(5–12) hydrocarbons with a higher CO conversion of about 95% was obtained for the FeNa _(2.0) @C catalyst compared to that for other alkali metal-modified Fe@C catalysts. According to the characterization results, the incorporation of alkali metals into Fe@C enhanced the conversion of FeCO _(3) to Fe _(3) O _(4) , which promoted the formation of the FTS active phase iron carbides. In particular, the strongest interaction of Fe–alkali metal and the highest amount of surface carbon layers were observed after adding an Na promoter into Fe@C in contrast to that observed for K and Li promoters, which strengthened the synergistic effect of Fe–Na metals and the spatial confinement of the core–shell structure, further improving the C _(5–12) hydrocarbon selectivity.
机译：尽管在将合成气转化为增值燃料的领域中已经进行了许多研究，但选择性地将合成气转化为汽油 - 范围碳氢化合物（C _（5-12）碳氢化合物）仍然是一个大挑战。通过用于费氏托合成的一步水热法合成碱金属（即K，Na和Li） - 级核酸核 - 壳催化剂。与其他碱金属改性的Fe @ C催化剂相比，获得具有较高CO转化的C _（5-12）烃的优化选择性为C _（5-12）烃的碳氢化合物为约95％的烃，与其他碱金属改性的Fe @ C催化剂相比。根据表征结果，将碱金属掺入Fe @ C中，增强了FeCo _（3）至Fe _（3）O _（4）的转化，该转化为促进FTS活性相铁碳化物的形成。特别地，与K和Li启动子的观察到相比，在将Na启动子添加到Fe @ C中，观察到Fe-alkali金属和最高量的表面碳层的最强相互作用，这加强了Fe-Na的协同作用金属和核心壳结构的空间限制，进一步改善C _（5-12）烃选择性。

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