以Fe₃O₄材料为磁核、Si （OC₂H₅）₄为包覆硅源，采用沉淀法制备了小粒径、包覆层厚度可控、单核核壳结构的氧化铁/氧化硅复合磁性微球式费托合成催化剂。利用XRD、VSM、SEM、TEM手段表征了催化剂晶相结构、磁性、形状大小，并以合成气为原料，利用费托合成固定床反应器对催化剂的费托合成性能进行评价。结果表明，制得的核壳包覆结构磁性颗粒壳厚100~150 nm，形成了平均粒径50 μm、粒径均一、球形规整度好的复合磁性微球费托催化剂；相同焙烧条件下，该催化剂比Fe₃O₄材料的比饱和磁化强度高25%；催化剂的CO转化率可达54%，CO₂选择性低于22%，CH₄选择性低于10%。

Using Fe₃O₄ as magnetic core and Si(OC₂H₅)₄ as coated silicon source, a magnetic microsphere Fischer-Tropsch synthesis catalyst with small particle size, controllable coating thickness and single core shell structure is prepared through the precipitation method.The crystal structure, magnetism, shape and size of the catalyst are characterized by means of XRD, VSM, SEM and TEM.The performance of the catalyst in Fischer-Tropsch synthesis is evaluated through using syngas as raw material in a Fischer-Tropsch synthesis fixed bed reactor.The results show that the prepared core-shell coated magnetic particles have a shell thickness of 100-150 nm, and form the composite magnetic microsphere Fischer-Tropsch catalyst with an average particle size of 50 μm, uniform particle size and good sphericity.Under the same roasting conditions, the specific saturation magnetization of the prepared catalyst is 25% higher than that of Fe₃O₄ material.The conversion rate of CO over the catalyst can reach 54%, the selectivity of CO₂ is less than 22%, and the selectivity of CH₄ is less than 10%.

张雪冰(1991-),男,硕士,工程师,研究方向为煤间接液化,xuebing.zhang.f@chnenergy.com.cn。