Ni-La-Mg上催化裂解甲烷生成碳纳米管的研究

The synthesis of carbon nanotubes by the catalytic decomposition of CH_4 on a Ni-La-Mg catalyst

采用气相沉积法催化合成碳纳米管,研究了反应条件及镍基催化剂中镧 (La)的加入对合成碳纳米管的影响,并用TEM,XRD,BET表征其形貌和结晶度,实验结果表明:Ni La Mg(摩尔比为 1 0.1 1)催化剂在 600℃反应 60min时表现出最佳活性,镍基催化剂中加入La后,能使所合成的碳纳米管管径更细,石墨化程度更高,热稳定性更好。

Carbon nanotubes were synthesized using chemical vapor deposition. The influences of reaction conditions and the addition of La to a Ni-based catalyst on the formation of carbon nanotubes Were investigated. The morphologies and graphitization degree of nanotubes Were determined by TEM. XRD. It was found that the optimum temperature and time were 600 degrees C and 60 min respectively. The addition of La to the Ni-hased catalyst produced smaller diameter carbon- nanotubes. The carbon nanotubes possess a well-graphitized structure and high thermal stability.