SiO2／HZSM-5对钴基催化剂费托合成汽油烃类的影响  

Influence of SiO_2/HZSM-5 supports on gasoline-range hydrocarbons synthesis with cobalt-based catalysts

作　　者：李宇萍[1] 王铁军[1] 吴创之[1] 李新军[1] 吕永兴[1] 

机构地区：[1]中国科学院可再生能源与天然气水合物重点实验室

出　　处：《现代化工》2008年第2期43-46,共4页Modern Chemical Industry

基　　金：国家自然科学基金资助(50506030);国家“973”项目(2007CB210207);中国科学院知识创新工程重要方向项目(KGCX2-YW-306)资助

摘　　要：以硅胶和HZSM-5分子筛为载体制备了钴基催化剂,在固定床上进行费托合成反应。考察了中孔硅胶和微孔HZSM-5的结合形式及载体和钴粒子间相互作用等对汽油类碳氢化合物合成的影响。结果表明催化剂具有一定的微孔和中孔结构对汽油类碳氢化合物合成有利,当硅胶中孔孔径适当时,HZSM-5均匀分布在大比表面硅胶上,使得催化剂同时具有中孔和微孔结构,具有较强的CO加氢反应能力和二次反应能力。实验中CO转换率达到83%,汽油类碳氢化合物选择性高达55%,其中异构烷烃选择性在10%以上。Fischer-Tropsch synthesis （FTS） has been carried out in a fixed-bed reactor with cobalt-based catalysts supported with meso-pore SiO2, micro-pore HZSM-5 zeolite and their hybrids. The effects of key factors including the meso-, micro-pore structures and interaction between the supports and cobalt particles on FTS activity are mainly investigated. The results indicate that FTS reaction is a structure sensitive process and the catalyst with suitable meso- and micro-pore structure is good for gasoline-range hydrocarbons production. When the pore structure is suitable, HZSM-5 will spread equably on the surface of the SiO2 support, this makes the catalyst have both meso- and micro-pore structure and show high CO hydrogenation and secondary reacting performance. The CO hydrogenation rate can be 83% and the selectivity of gasoline-range hydrocarbons be as high as 55% including more than 10% of isoparaffins in this study.

关 键 词：硅胶 HZSM-5 钴基催化剂 费托合成 

分 类 号：TQ426.65[化学工程]