不同载体和前驱体对钴基催化剂浆相费托合成性能的影响  

Effect of supports and precursors on Co-based fine particle catalyst for slurry phase Fischer-Tropsch synthesis

作　　者：李剑锋[1] 侯学锋[1] 代小平[1] 余长春[1] 

机构地区：[1]石油大学中国石油天然气集团公司催化重点实验室,北京102249

出　　处：《石油大学学报（自然科学版）》2004年第5期94-98,共5页Journal of the University of Petroleum,China(Edition of Natural Science)

基　　金：国家重大基础研究项目(G1999022402)

摘　　要：以SiO2和γ Al2O3为载体,以硝酸钴、醋酸钴和氯化钴为前驱体,利用浸渍法制备出钴基细粒子催化剂。用X射线衍射、程序升温还原、比表面测试等技术考察了钴基催化剂的结构和还原性能,分析了不同载体和前驱体对浆相费托反应性能的影响。结果表明,SiO2载体上钴物种的分散度和还原度均高于γ Al2O3载体,因而Co/γ Al2O3催化剂的活性最差,CO转化率远低于Co/SiO2催化剂。不同钴前驱体所制备的Co/SiO2催化剂钴物种的分散度和还原度有很大的差别,其相应的Co/SiO2催化剂的浆相费托活性顺序由大到小依次为:Co(NO3)2,Co(NO3)2+Co(CH3CO2)2,Co(CH3CO2)2,CoCl2。Cobalt-based fine particle catalysts were prepared from different supports of SiO_2 and γ-Al_2O_3 and cobalt precursors of Co(NO_3)_2, Co(CH_3CO_2)_2 and CoCl_2 by using impregnation method. The structure and reduction property of the catalysts were characterized by X-ray diffraction (XRD) Brunner-Emmett-Teller (BET) and temperature-programmed-reduction (TPR) techniques. The different support and precursor on the Fischer-Tropsch synthesis (F-T synthesis) reaction of slurry phase were investigated. The results show that the dispersion and the reducibility of Co oxide species on SiO_2 support are much better than those of the species on γ-Al_2O_3 support, which results in far higher F-T synthesis activity of Co-SiO_2 catalyst than that of Co-γ-Al_2O_3 catalyst. The different cobalt precursors can result in quite different dispersion and reducibility of Co-SiO_2. The F-T synthesis activity of slurry phase in Co-SiO_2 catalysts prepared by different cobalt precursors is getting poor in the following order: Co(NO_3)_2, Co(NO_3)_2+Co(CH_3CO_2)_2, Co(CH_3CO_2)_2, CoCl_2.

关 键 词：前驱体 钴基催化剂 SiO2 Γ-AL2O3 费托合成 载体 还原性能 程序升温还原 分散度 X射线衍射 

分 类 号：TE646[石油与天然气工程—油气加工工程] TQ426[化学工程]