Al_2O_3助剂对Co/SiC催化剂F-T反应性能的影响  

Effect of Al_2O_3 addition on the catalytic performance of Co/SiC catalyst for Fischer-Tropsch synthesis

作　　者：孔晓[1,2] 侯博[1] 贾丽涛[1] 黄巍 孙志强 李德宝[1] 李晋平 

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 [3]潞安(矿业)集团有限公司,山西长治046204

出　　处：《燃料化学学报》2013年第10期1217-1222,共6页Journal of Fuel Chemistry and Technology

摘　　要：分别采用沉淀法、尿素水解法制备Al2O3/SiC复合载体,采用等体积浸渍法制备Co/Al2O3-SiC催化剂。结合N2吸附、XRD、H2-TPR、XPS等表征手段,研究Al2O3助剂对钴基催化剂物相结构、还原行为以及F-T合成性能等的影响。结果表明,氧化铝加入后增强了载体与钴物种之间的相互作用,提高了钴物种的分散度,降低了钴物种的还原度。尿素水解法引入Al2O3后,载体与钴物种具有适中的相互作用,表现出较高的反应活性。沉淀法制备的载体负载钴物种后由于较强的金属-载体相互作用,表现出较优的稳定性。Two A12 03 -modified catalysts were prepared by urea hydrolysis method and precipitation disposition method respectively. Combined with N2 adsorption, XRD, XPS and HE-TPR, the effects of A1203 on the physico-chemical properties and catalytic properties for the Fischer-Tropsch synthesis were investigated. It was found that the metal-support interaction could be effectively strengthened for both catalysts. Consequently, the dispersion of the catalyst was enhanced and the Fischer-Tropsch synthesis activity was increased. The results also indicated that the modification of Co/SiC catalyst strongly depended on the preparation method. The highest CO conversion was observed on the catalyst prepared by urea hydrolysis method due to the superior dispersion and good reducibility. Besides, the catalytic stability was enhanced due to the stronger interaction between cobalt and A12O3 prepared by precipitation disposition method.

关 键 词：费托合成 钴基催化剂 氧化铝助剂 尿素水解法 沉淀法 

分 类 号：TQ032.41[化学工程]