尿素诱导铁/石墨烯合成及费托反应性能研究

Synthesis and Fischer-Tropsch performances of urea induced-iron/graphene

费托合成是煤炭间接液化技术的核心,可以将煤炭资源经合成气转化为液体燃料等高附加值化学品。通过添加尿素一步水热法成功制备了石墨烯负载特定孔道结构的铁催化剂,并研究孔道结构对费托合成反应性能的影响。结果表明:添加尿素能够成功在铁纳米粒子中制造孔道,形成具有特定孔道结构的PFe-G催化剂,使其具有较高的孔体积和孔尺寸;尿素的弱还原性促进了氧化石墨烯的还原,使得PFe-G中含有较少的C=O官能团,表现出易还原碳化行为;与Fe-G相比,PFe-G表现出较高的CO转化率和重质烃选择性。

Fischer-Tropsch synthesis is the key of coal indirect liquefaction technology,which can convert coal into liquid fuel and high value-added chemicals via syngas.Graphene supported iron catalysts with specific pore structure was prepared by one-step hydrothermal method with the addition of urea.Also,the effect of pore structure on the Fischer-Tropsch synthesis performances was investigated.The results show that urea addition during synthesis can yield pores in iron nanoparticles,forming PFe-G catalysts with specific pore structure.Therefore,PFe-G has relative larger pore volume and pore size.Urea with weak reducibility facilitates the reduction of graphene oxide,and thus small amount of C=O functional groups is retained on PFe-G catalysts.Compared with Fe-G catalyst,PFe-G catalysts show easier reduction and carburization behaviors,and high CO conversion and heavier hydrocarbons selectivity.