用激光热解法制备了非晶态Fe/C超微粉,经有机溶剂洗涤及高温处理获得了碳化铁催化剂。用XRD、TEM及电子衍射测试结果表明,其粒度大都在1～4nm之间,为多晶态的α-Fe、Fe_3C。经测试表明,在常压下反应温度为380℃时,碳化铁超微粒子催化剂具有较高的活性和对低碳烯烃的高选择性。通过测试催化剂在使用过程中的物相变化,进一步证明了F-T合成催化活性物种为α-Fe、Fe_xC_y的碳化物机理。 The amorphous Fe / C superfine powder was prepared by laser pyrolysis, and the iron carbide catalyst was obtained by organic solvent washing and high temperature treatment. The results of XRD, TEM and electron diffraction show that the particle size is mostly between 1 and 4 nm, which is the polycrystalline α-Fe and Fe_3C. The test shows that, under atmospheric pressure, the reaction temperature is 380 ℃, the iron carbide ultrafine particle catalyst has high activity and high selectivity to light olefins. The carbides of α-Fe and Fe_xC_y catalyzed by F-T were further confirmed by testing the phase change of the catalyst during its use.