CoAl_2O_4/Al_2O_3载体对钴基费托催化剂反应性能影响的研究  

Catalytic properties of CoAl_2O_4/Al_2O_3 supporte d cobalt catalysts for Fische r-Tropsch synthesis

作　　者：韩健康[1,2] 贾丽涛[1] 侯博[1] 李德宝[1] 刘岩[1] 刘亚纯[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院大学,北京100049

出　　处：《燃料化学学报》2015年第7期846-851,共6页Journal of Fuel Chemistry and Technology

摘　　要：通过浸渍和高温焙烧,制得表面附着Co Al2O4微晶颗粒的改性Al2O3载体,并采用等体积浸渍法制备负载型Co基催化剂。结合N2物理吸附、XRD、H2-TPR、XPS及H2化学吸附等表征手段,研究改性载体及其负载钴基催化剂的织构特征;采用费托合成反应评价其催化性能。结果表明,Al2O3改性后,表面Co Al2O4的存在有效减少了载体与活性组分Co的相互作用,显著提高了催化剂的还原度和催化活性。载体的改性量在20%左右达到最佳值,继续增加,催化剂还原度和活性基本不再升高。载体改性促使催化剂CH4选择性有所降低,C5+选择性略有提高。The y-AAl2O3 modified with CoAl2O3 by the impregnation method was used as support to prepare cobalt catalysts. The physicochemical properties of the prepared catalysts were characterized with BET, XRD, H2-TPR and XPS techniques and H2-chemisorption experiment. The catalytic properties of the prepared catalysts were investigated for Fischer-Tropsch synthesis. It was shown that COAl2O3 existed on the surface of T-Al2O3, and thus, effectively weakening the interaction of Co and AI203 and resulting in a great increase in the reduction degree and the catalytic activity. The sample with a CoAl2O3 content of 20% shows the highest catalytic activity. It is worth noting that the CoAl2O3 modification decreased the CH4 selectivity but enhanced the C5＋ selectivity and catalytic stability.

关 键 词：费托合成 钴基催化剂 氧化铝改性 铝酸钴 

分 类 号：TQ032.41[化学工程]