Fe-Mo/Al_2O_3催化剂催化分解甲烷制备碳纳米管:温度对碳管结构的影响(英文)

Growth of carbon nanotubes by the catalytic decomposition of methane over Fe-Mo/Al_2O_3 catalyst:effect of temperature on tube structure

利用化学气相沉积法,以Fe-Mo/Al2O3为催化剂,催化分解甲烷气体制备碳纳米管(CNTs)。研究了温度,反应时间和气体流速对碳纳米管结构的影响。结果显示:温度是影响碳纳米管壁厚的关键参数。低温导致壁厚为2nm～7nm的多壁碳纳米管(MWCNTs)的生成。相对地,高温有利于双壁碳纳米管(DWCNTs)的生长,而更高的温度促使单壁碳纳米管(SWCNTs)的产生。进一步升高温度,得到了壁厚为3nm～15nm的MWCNTs和大的炭颗粒。

The effects of temperature,reaction time,and flow rate on the structure of carbon nanotubes （CNTs） were studied using catalytic chemical vapor deposition of methane over an Fe-Mo/Al2O3 catalyst. Results show that the temperature is a key parameter to control the wall thickness of the CNTs. Low temperature leads to the formation of multiwalled carbon nanotubes （MWCNTs） with wall thickness of 2-7 nm. Relatively high temperature is in favor of the growth of double-walled carbon nanotubes （DWCNTs）,whereas high temperature promotes the generation of single-walled carbon nanotubes （SWCNTs）. A further increase of temperature results in the generation of MWCNTs with a wall thickness of 3-15 nm and large carbon particles.