载体焙烧温度对Co/Al_2O_3催化剂F-T合成反应催化性能的影响  

Effects of calcination temperature of support on catalytic performance of Co/Al_2O_3 catalysts for Fischer-Tropsch synthesis

作　　者：丁宁[1] 曾尚红[1] 张晓红[1] 王磊[1] 于世泳[1] 苏海全[1] 

机构地区：[1]内蒙古大学化学化工学院内蒙古自治区煤炭化学重点实验室,内蒙古呼和浩特010021

出　　处：《工业催化》2012年第4期11-15,共5页Industrial Catalysis

基　　金：国家自然科学基金(20661001)资助项目;教育部新世纪优秀人才支持计划(NCET-04-0261);内蒙古自然科学基金重大项目(200408020201)

摘　　要：采用等体积浸渍法,以不同温度焙烧的Al2O3为载体制备Co/Al2O3催化剂,通过N2物理吸附、X射线衍射和程序升温还原等方法对催化剂进行表征,并在固定床反应器中评价催化剂的F-T合成反应性能。结果表明,低温焙烧可获得较大比表面积的Al2O3载体,有利于提高活性组分的分散度,但增强了钴与载体之间的相互作用,降低催化剂活性和选择性。高温焙烧的Al2O3载体有利于提高C5+选择性,尤其是柴油组分的选择性。Using Al2O3 as the supports,（12%）Co/Al2O3 catalysts were prepared at different calcination temperature by incipient wetness impregnation method.The catalysts were characterized by N2 physisorption,XRD,and TPR.The catalytic performance of the catalysts for Fischer-Tropsch synthesis was evaluated in a fixed-bed reactor.The results indicated that when Al2O3 was calcined at lower temperature,the support with higher BET surface area was obtained,which enhanced the dispersivity of cobalt and the interaction between cobalt and Al2O3 support,resulting in the reduction of catalytic activity and selectivity.The catalyst with Al2O3 support calcined at higher temperature showed higher selectivity to C＋5 fraction,especially the selectivity to diesel fraction.

关 键 词：催化化学 氧化铝 负载型催化剂 焙烧温度 F-T合成 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]