Fe/Fe_(5)C_(2)催化剂光热催化费托合成制备低碳烯烃

Preparation of Lower Olefins via Photothermocatalytic Fischer-Tropsch Synthesis over Fe/Fe_(5)C_(2) Catalyst

光热催化费托合成是一种低能耗、可持续的低碳烯烃合成工艺。铁基催化剂因具有成本低和原料来源广等优点,被广泛用于费托合成制备低碳烯烃。铁基催化剂中的碳化铁(Fe_(5)C_(2))对低碳烯烃的选择性高但反应温度要求较高,而金属铁催化剂可以在较低温度下催化费托合成反应。本工作通过制备Fe/Fe_(5)C_(2)复合催化剂,优化Fe和Fe_(5)C_(2)的占比,实现了在光照条件下,低至250℃的工作温度催化费托合成反应制备低碳烯烃,CO的转化率为22.3%,低碳烯烃的选择性高达54.4%。

Photothermocatalytic Fischer-Tropsch synthesis provides an energy-efficient and sustainable process for the synthesis of lower olefins.Iron-based catalysts are widely used in Fischer-Tropsch synthesis for lower olefins production due to their low cost and wide source.Among the iron-based catalysts,Fe_(5)C_(2) exhibits high selectivity towards lower olefins but requires a higher reaction temperature,while the metallic iron catalyst can catalyze Fischer-Tropsch synthesis at a lower temperature compared with Fe_(5)C_(2).In this work,Fe/Fe_(5)C_(2) composite catalyst was prepared and the proportion of Fe and Fe_(5)C_(2) was optimized.Thus,under light irradiation,the photothermocatalytic Fischer-Tropsch synthesis can be operated at reaction temperature as low as 250℃;an optimized catalyst exhibits the high selectivity of 54.4%for lower olefins at the CO conversion of 22.3%.