关键词: 蛋壳催化剂, 费托合成, 钴基, 氧化铝, 催化性能

Abstract: 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.

Key words: egg-shell catalyst, F-T synthesis, Cobalt based, alumina, catalytic performance