铜助剂对费-托合成沉淀铁催化剂的影响  

Effects of Copper on the Precipitated Iron Fischer-Tropsch Catalysts

作　　者：张煜华[1] 熊海峰[1] 李金林[1] 

机构地区：[1]中南民族大学化学与生命科学学院催化材料科学湖北省重点实验室,湖北武汉430074

出　　处：《武汉大学学报（理学版）》2004年第6期678-682,共5页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金(20373090);湖北省杰出青年人才基金(2003ABB013);教育部留学归国人员科研启动基金;教育部优秀青年教师资助计划项目;国家民委重点基金

摘　　要：用X 射线衍射、氢气程序升温还原、氢气程序升温脱附和氧滴定等技术对沉淀法制备的铜 铁费 托合成催化剂进行了表征.结果表明,铜促进了Fe2O3→Fe3O4的还原,且使该过程的起始还原温度明显降低,但对Fe3O4→FeO→Fe两个还原过程无影响;通过浸渍法加入的铜虽可较好地分散在催化剂表面,但却导致了氢气的吸附量减少,同时由于Cu和Fe之间可能存在的相互作用,使催化剂中的还原态物质在氧滴定中不能被充分氧化;Cu还有助于Fe在催化剂表面的分散.The iron Fischer-Tropsch catalysts were prepared by precipitation. The catalysts were characterized by X-ray diffraction (XRD), hydrogen temperature programmed reduction (H_(2)-TPR), hydrogen temperature programmed desorption (H_(2)-TPD) and oxygen titration respectively. The results show that copper can facilitate the reduction of iron oxide, especially the transformation of Fe_(2)O_(3)→Fe_(3)O_(4),however, copper cannot affect the reduction of Fe_(3)O_(4)→FeO→Fe. Though the copper was dispersed well on the catalyst by impregnation, the metal-metal interaction between iron and copper influences the reoxidation of (iron)-copper catalysts and the hydrogen-chemisorption properties of catalyst. The copper can help the dispersing of iron on the catalyst.

关 键 词：费-托合成 铁催化剂 铜助剂 X射线衍射 氢气程序升温还原 氢气程序升温脱附 氧滴定 

分 类 号：O643.3[理学—物理化学]