使用浮动催化裂解法以CH4为碳源,二茂铁和硫为催化剂,制取了双壁碳纳米管,并确定了优化参数:反应温度为1200℃,蒸发温度为80℃,Ar流量标准状态下为2000 cm3/min,CH4流量标准状态下为5 cm3/min.经优化后双壁碳纳米管的纯度可以达到质量分数90％以上. Double-walled carbon nanotubes were prepared by using floating catalytic cracking method with CH4 as carbon source, ferrocene and sulfur as catalyst, and the optimal parameters were determined: the reaction temperature was 1200 ℃, the evaporation temperature was 80 ℃, and the standard Ar flow rate Under 2000 cm3 / min, and CH4 flow rate of 5 cm3 / min under standard condition.The purity of the double walled carbon nanotubes after optimization can reach above 90% by mass.