碳纳米管的改性及对Co/CNTs催化剂费托-合成反应性能的影响  

Modification of carbon nanotubes and its effect on performance of Co/CNTs catalyst for F-T synthesis

作　　者：吕静[1] 白素丽[1] 黄承都[1] 马新宾[1] 李振花[1] 

机构地区：[1]天津大学化工学院绿色合成与转化教育部重点实验室,天津300072

出　　处：《天然气化工—C1化学与化工》2011年第5期1-8,共8页Natural Gas Chemical Industry

基　　金：国家自然科学基金(21076151)资助项目;教育部新世纪人才计划(NCET-06-0239)资助项目

摘　　要：对碳纳米管(CNTs)通过化学处理等方法改性进行了研究。结果表明,改性处理可有效提高CNTs的比表面积和其表面的含氧基团数量,其中硝酸共沸回流处理的效果最好,随着硝酸浓度增加可提高处理效果。使用硝酸改性后的CNTs通过等体积浸渍法制备的Co/CNTs费-托反应催化剂,显著提高了CO转化率,CH4选择性略有增加,C5+选择性略有降低,这与催化剂表面Co分散度提高且其颗粒直径较小有关。The modification of carbon nanotubes （CNTs） by the methods of chemical treatment etc. was investigated. The results Showed that modification of CNTs could significantly increase the specific surface area of CNTs and the amount of oxygen-containing groups on the surface of CNTs. Among several modifying methods, nitric acid co-boiling reflux treatment gave the best result, and using the higher concentration nitric acid for the modification was better. F-T synthesis reaction over the nitric acid-treated CNTs supported cobalt catalyst Co/CNTs prepared by incipient wet impregnation method could significantly increase CO conversion with slight increase of CH4 selectivity and somewhat decrease of C5＋ selectivity. This was attributed to the increase of cobalt dispersion and the decrease of cobalt particle size in the Co/CNTs catalyst.

关 键 词：碳纳米管 硝酸 改性 钴 费-托合成 

分 类 号：O643[理学—物理化学]