Both one-pot solvothermal method and impregnation were adopted to synthesize sodium modified Fe-Mn microsphere catalysts for Fischer–Tropsch synthesis (FTS) of light olefins. The effects of Mn and Na promoters on the microsphere morphology, electronic state and catalytic performance of Fe₃O₄ catalysts were evaluated by Ar adsorption-desorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive spectroscopy mapping (EDS-mapping), H₂ temperature-programmed reduction (H₂-TPR), CO temperature-programmed desorption (CO-TPD), X-ray photoelectron spectroscopy (XPS) and Mössbauer spectra. SEM, TEM and Ar adsorption-desorption showed that catalysts were in a uniform spherical shape with the size of 300−400 nm, while FeMn microsphere owned a smaller size and a larger surface area. Mn promoter could enhance the chemisorption of CO, and suppressed the hydrogenation of olefins, then lead to higher selectivity of light olefins. Na promoter strengthened the FTS reaction activity due to its basicity and electronic donation. Mn15Na32_im showed the highest CO conversion of 97.21 % with the light olefin selectivity of 33.02 %.

采用一锅溶剂热法和浸渍法合成钠改性铁锰微球催化剂，用于轻质烯烃的费托合成（FTS）。采用Ar吸附-脱附、X射线衍射（XRD）、扫描电子显微镜（SEM）、高分辨率透射法评价了Mn和Na助剂对Fe ₃ O ₄催化剂微球形貌、电子态和催化性能的影响。电子显微镜 (HRTEM)、能量色散光谱映射 (EDS-mapping)、H ₂程序升温还原 (H ₂-TPR)、CO 程序升温脱附 (CO-TPD)、X 射线光电子能谱 (XPS) 和穆斯堡尔光谱。SEM、TEM和Ar吸附-脱附表明催化剂呈均匀的球形，尺寸为300-400 nm，而FeMn微球尺寸较小，表面积较大。Mn助剂可以增强CO的化学吸附，抑制烯烃的加氢，从而提高轻质烯烃的选择性。Na促进剂由于其碱性和电子捐赠增强了FTS反应活性。Mn15Na32 _im的 CO 转化率最高，为 97.21%，轻烯烃选择性为 33.02%。