催化剂制备条件对碳纳米管的影响

Effects of Preparation Conditions of Catalysts on the Carbon Nanotubes

用柠檬酸络合法制备的Ni-La-Mg型催化剂催化裂解甲烷合成碳纳米管,并通过测定活性镍表面积研究了催化剂制备过程中柠檬酸浓度及活化温度对碳纳米管生成的影响.TEM测定结果表明,经凝胶自燃烧产生的催化剂,可通过改变柠檬酸的浓度来制得不同粒径的催化剂颗粒,从而获得一定管径的碳纳米管.另外,在500～700℃内,活化温度对催化剂活性影响不大,只有在较低或较高温度时对活性才有较大的影响.

A method of 'citric acid comples' was employed to prepare the Ni\|La\|Mg catalyst, on which carbon nanotubes were synthesized from catalytic decomposition of CH\-4. During the process of the preparation of catalysts, the effects of the concentrations of citric acid and the activation temperatures of catalysts on carbon nanotubes were investigated by examining the surface area of activation nickel in the catalyst. The result of TEM observations showed that, produced through the auto\|combusting of gelatine, the catalyst particles with different diameter were prepared by diversifying the concentrations of citric acid, then a certain diameter carbon nanotubes could be obtained. From 500 ℃ to 700 ℃, the effects of activation temperature on the activity of catalyst was limited, except lower and higher temperatures.