蛋壳型分布费托合成催化剂Co/Al_2O_3的表征及催化性能  

CHARACTERIZATION AND CATALITIC PROPERTY OF EGGSHELL Co/Al_2O_3 CATALYST FOR F-T SYNTHESIS

作　　者：孙霞[1] 侯朝鹏[1] 夏国富[1] 王倩[1] 

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《石油炼制与化工》2011年第7期28-32,共5页Petroleum Processing and Petrochemicals

摘　　要：以Al2O3为载体,制备蛋壳型分布的费托合成催化剂Co/Al2O3。采用SEM,XRF,XRD,BET,TPR方法对催化剂进行表征并进行催化性能评价。表征结果表明,Co主要集中在蛋壳型分布催化剂的外表面区域内;蛋壳型分布的催化剂上钴氧化物的晶粒大小与均匀型催化剂相当,并且物理性质相近。催化性能评价结果表明,与均匀型催化剂相比,在相同的评价条件下,蛋壳型分布的催化剂具有高的费托合成活性和高的C5+选择性,低的甲烷选择性。催化剂的壳层厚度在一定范围内变化时,对催化剂的催化性能基本没有影响。Co/Al2O3 F-T synthesis catalyst with eggshell distribution of active metal（eggshell catalyst）was prepared and characterized by SEM, XRF,TPR, BET, XRD and UV--vis techniques. Results showed that cobalt was mainly dispersed on the outer surface of alumina pellets in this prepared eggshell catalyst;the physical properties of eggshell catalyst were almost the same with those of the conventional catalyst having uniform distribution of cobalt,and the average crystal size of Co3O4 was similar in these two cases. The evaluation results of catalytic performance showed that under the same evaluation conditions compared with conventional catalyst, eggshell catalyst exhibited an obviously higher activity and C5＋ selectivity,at the same time,its CH4 selectivity was lower. Furthermore, the shell thickness had no significant effect on the catalytic performance of the catalyst in a certain limited range.

关 键 词：蛋壳型催化剂 费托合成 钴基 氧化铝 催化性能 

分 类 号：TQ529.2[化学工程—煤化学工程]