Carbon supported iron catalysts for Fischer-Tropsch synthesis, with the same iron loading of ca. 35 wt.%, were prepared by pyrolysis process and incipient wetness impregnation methods. The effect of the preparation methods on the catalyst structure, catalytic properties, and the direct conversion of syngas via Fischer-Tropsch synthesis was investigated. The iron species, iron particle size and iron reducibility depended on the preparation method. The pyrolysis of homogeneous fusion yielded a unique core-shell structure with dispersed iron species embedded in a matrix of porous carbon. The FeO_x/AC catalyst obtained by incipient wetness impregnation contained Fe₂O₃ species after calcination, while the core-shell structured catalyst obtained by pyrolysis process contained Fe₃C species after calcination. The results show that the core-shell structure iron-based catalyst had higher extent of carburization and dispersion, which led to higher activity for Fischer-Tropsch reaction than that of other two catalysts obtained by different synthesis methods. Furthermore, the Fe₃[email protected] catalyst promoted by alkali metals (Na, Mg, K, Ca) resulted in the increase of O/P ratio and low carbon olefin selectivity, and the decrease of methane selectivity.

费-托合成用碳载铁催化剂，铁负载量相同。通过热解法和初期湿润浸渍法制备35重量％。研究了制备方法对催化剂结构，催化性能和费-托合成法直接转化合成气的影响。铁的种类，铁的粒径和铁的还原性取决于制备方法。均质熔解的热解产生了独特的核-壳结构，其中分散的铁物种嵌入在多孔碳基质中。通过初期湿润浸渍得到的FeO _x / AC催化剂含有Fe ₂ O _3。焙烧后得到的核壳结构催化剂中，Fe ₃ C的种类多。结果表明，核壳结构铁基催化剂的渗碳和分散程度较高，与通过不同合成方法获得的其他两种催化剂相比，具有更高的费-托反应活性。此外，碱金属（Na，Mg，K，Ca）促进的Fe ₃ [电子邮件保护]催化剂导致O / P比增加和低碳烯烃选择性，并降低了甲烷选择性。