用SMAI法制备的Co/SiO_2和Co/La-SiO_2催化剂的比较  

Comparison between Co/SiO_2 and Co/La-SiO_2 Catalyst Samples Prepared via Solvated Metal Atom Impregnation Method

作　　者：吴世华[1] 黄唯平[1] 邱晓航[1] 张守民[1] 郑修成[1] 魏伟[1] 

机构地区：[1]南开大学化学系,天津300071

出　　处：《催化学报》2001年第5期505-507,共3页

基　　金：天津市自然科学基金资助项目 ( 9836 0 36 11)

摘　　要：The solvated metal atom impregnation (SMAI) method was used to prepare Co/SiO 2 and Co/La SiO 2 catalyst samples with 5%Co content. The XPS results showed that the cobalt particles both in SiO 2 and in La SiO 2 existed in zero valent state (Co\+0). The CO chemisorption results showed that the cobalt particle size (5 3 nm) of Co/La SiO 2 sample was much smaller than that (8 1 nm) of Co/SiO 2 sample. The turnover frequency (TOF) of CO on Co/La SiO 2 sample was higher than that on Co/SiO 2 sample in F T reaction (CO hydrogenation), which was probably due to the fact that the cobalt particle size in Co/La SiO 2 sample was much smaller than that in Co/SiO 2 sample. The experimental results also showed that the selectivity of Co/La SiO 2 sample for long chain paraffins was higher than that of Co/SiO 2 sample.The solvated metal atom impregnation (SMAI) method was used to prepare Co/SiO 2 and Co/La SiO 2 catalyst samples with 5%Co content. The XPS results showed that the cobalt particles both in SiO 2 and in La SiO 2 existed in zero valent state (Co\+0). The CO chemisorption results showed that the cobalt particle size (5 3 nm) of Co/La SiO 2 sample was much smaller than that (8 1 nm) of Co/SiO 2 sample. The turnover frequency (TOF) of CO on Co/La SiO 2 sample was higher than that on Co/SiO 2 sample in F T reaction (CO hydrogenation), which was probably due to the fact that the cobalt particle size in Co/La SiO 2 sample was much smaller than that in Co/SiO 2 sample. The experimental results also showed that the selectivity of Co/La SiO 2 sample for long chain paraffins was higher than that of Co/SiO 2 sample.

关 键 词：费托合成 溶剂化金属原子浸渍法 镧助剂 钴基催化剂 二氧化硅 一氧化碳 化学吸附 SMAI F-T合成 

分 类 号：O643.3[理学—物理化学]