21-I-004
流化床－化学气相沉积法可控及批量制备碳纳米管
骞伟中＊，魏飞
清华大学化工系，100084，北京
E-mail: qianwz@mail.tsinghua.edu
化学气相沉积法目前已经发展成为批量制备碳纳米管的最有效率方法之一。而流化床－化学气相沉积法更是提供了大量碳纳米管充分生长的超大空间以及均匀的传热传质环境。在此，本文将总结流化床－化学气相沉积法的主要核心。
1. 任何可以悬浮的颗粒均可以用流化床进行连续处理。所以流化床－CVD法可以生产多种碳纳米管。碳纳米管不
仅可以生长在微米级的聚团状多孔催化剂颗粒上，也可生长在毫米级的陶瓷球的表面上，还可以生长在层状无机氧化物的层间，以大量得到聚团状的碳纳米管或毫米级长度的碳纳米管阵列。
2. 双层变温流化床可以允许在不同级上的催化剂采用不同温度操作，从而可以调变催化剂的高温活性以便提高碳
纳米管的收率。
3. 下行床与湍动床耦合的反应器技术可以调变催化剂还原与碳沉积的平衡，还能充分利用催化剂的活性，从而大
批量制备高质量的单／双壁碳纳米管。
关键词：碳纳米管；流化床；化学气相沉积。
Large scale and controllable production of carbon nanotubes by fluidized bed-Chemical vapor deposition
Wei-zhong Qian*, Fei Wei
Department of Chemical Engineering, Tsinghua University, Beijing,
deposition
100084,China
Chemical vapor deposition(CVD) has been developed as one of the most effective methods to produce carbon nanotubes to this date. Fluidized bed-CVD has the advantage of large reactor volume to offer sufficient space with uniform mass and heat transfer condition, which is crucial to the growth of carbon nanotubes in large quantities. Here, I will summarize the key point of fluidized bed CVD.
One, any suspended particles can be disposed continuously in fluidized bed, which allows the fluidized bed suitable for the production of many kinds of carbon nanotubes, whether grown on the micron-sized agglomerate catalyst particles, or on the surface of millimeter-sized ceramic spheres, as well as on the layered metal oxides. Thus fluidized bed- CVD is suitable for the mass production of agglomerate carbon nanotubes and the millimeter long vertically aligned carbon nanotube array.
Second, the temperature shift two-stage fluidized bed offers an unique operation of catalyst in different temperature zones in different positions, and is effective to tailor the catalyst activity for a high yield production of carbon nanotubes in high temperature.
Third, the coupled down reactor and turbulent fluidized bed reactor is effective to control the balance of catalyst reduction and carbon deposition, and to utilize the maximal activity of the catalyst in the production of high quality of single or double walled carbon nanotubes.
Keywords：Carbon Nanotubes; Fluidized Bed; Chemical Vapor Deposition.
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