等离子体射流辅助双催化剂原位催化法合成碳纳米管

以甲烷为碳源，Fe2O3／Ni为固定相催化剂，在常压条件下利用等离子体射流的高温将甲烷裂解生成碳自由基和氢气。同时联合原位催化法将碳自由基在Fe2O3／Ni双催化剂的共同作用下生长出碳纳米管。运用TEM和元素分析等测试手段对所得碳纳米管进行形貌、含量、结构的表征分析。结果表明，在一定反应条件下，可获得外径为10nm-30nm，管长约数百纳米、产率为75％左右的碳纳米管。与单催化剂相比，双催化剂的联合催化作用更有利于碳管的生长。

Plasma jet assisted synthesis of carbon nanotubes by in-situ bimetallic catalysts

Carbon nanotubes were synthesized in a methane plasma by using Fe2O3/Ni as catalysis. Methane is pyrolyzed efficiently into nano-carbon and H2 by the plasma jet under atmospheric pressure, during which Fe2O3 is reduced by H2 to form nanometer sized metallic particles, which together with Ni are used as bimetallic catalysts for the preparation of nanotubes. The carbon nanotubes were examined using TEM and chemical element analysis, etc. Results show that the carbon nantotubes present an appearance of entangled morphologies with outer diameters of 10 - 30 nm, length of several hundred nanometers, and the yield is about 75 %. Compared with the single catalyst, the bimetallic catalyst is advantageous for the mass production of carbon nanotubes.