以甲烷为碳源,co-Mo/MgO为催化剂,通过气相化学沉积制备了直径均匀的多壁碳纳米管(MWC-NTs).采用溶胶-凝胶法所制双金属催化剂的组成为Co∶Mo∶MgO=5∶20∶75(质量比).热重分析表明多壁碳纳米管产率高达313.67%.催化剂对于多壁碳纳米管生长的选择性是91.17%(其余为无定形碳).透射电子显微镜分析显示:催化剂七生长的MWCNTs平均直径为6.2±0.5nm(平均±标准偏差).通过稀酸的简单纯化处理,纯化样品的催化剂残存率降至0.72%.
Nearly uniform diameter multi-walled carbon nanotubes (MWCNTs) were synthesized over a magnesia sup-ported Co-Mo bimetallic catalyst through the catalytic chemical vapor deposition of methane. The bimetallic catalyst with a composition of Co: Mo: MgO =5: 20:75 ( mass ratio) was prepared by a sol-gel method. Thermagravimetric analysis shows that MWCNTs were synthesized in high yield. The selectivity of the catalyst for MWCNTs over undesired amor-phous carbon was 91.17%. Transmission electron microscopy indicates that the MWCNTs grown on the catalyst have an average diameter of 6.2±0.5 nm(mean±standard deviation). Through simple purification by mild acid treatment, the catalyst residue for the purified samples was reduced to 0.72%.
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