Co-Mo/MgO催化剂上甲烷化学气相沉积制备高纯度多壁碳纳米管(英文)

Synthesis of high purity multi-walled carbon nanotubes over Co-Mo/MgO catalyst by the catalytic chemical vapor deposition of methane

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%。

Nearly uniform diameter multi-walled carbon nanotubes （MWCNTs） were synthesized over a magnesia supported 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 amorphous 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%.