| 摘要 |
<p>The present invention relates to a method for producing dour e-walled carbon nanotubes, comprising: a) a step of gas phase reducing reaction and deposition, wherein the liquefied petroleum gas or methane is used as carbon source, reducing agent is selected from the group of hydrogen, carbon monoxide, or the mixture thereof, the carbon source is reacted with the reducing agent under catalyst at the temperature of 600°C to 1000°C by chemical gas-phase deposition, thereby the primary product of the double-walled carbon is obtained; and b) a step of purification, wherein carbon dioxide and oxides of transition metal are used as combined catalyst, and the amorphous carbon in the carbon nanotubes is purified under the combined catalyst at the temperature of 600°C to 900°C. The present invention also relates to the double-walled carbon nanotubes produced according the method, which has a high purity (90%), a high yield (1~g/h), and can be produced in large scale.</p> |
