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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:催化剂上生长的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%。
MWCNTs with uniform diameter were prepared by vapor phase chemical deposition using methane as carbon source and Co-Mo / MgO as catalyst. The bimetallic catalyst prepared by the sol-gel method has a composition of Co: Mo: MgO = 5:20:75 (mass ratio). Thermogravimetric analysis showed that the yield of multiwalled carbon nanotubes was as high as 313.67%. The selectivity of the catalyst for the growth of multi-walled carbon nanotubes is 91.17% (the rest is amorphous carbon). Transmission electron microscopy analysis showed that the average diameter of MWCNTs grown on the catalyst was 6.2 ± 0.5 nm (mean ± standard deviation). By simple purification of dilute acid, the catalyst residual rate of the purified sample dropped to 0.72%.