甲烷还原Ni基催化剂化学气相沉积法制备碳纳米管

Synthesis of Carbon Nanotubes by Catalytic Chemical Vapor Deposition over Methane Reduced Ni Catalyst

以Ni O/γ-Al2O3为催化剂,甲烷气为碳源,采用催化化学气相沉积法制备碳纳米管。利用热重分析法研究了甲烷气氛下Ni O/γ-Al2O3催化剂的还原行为,考察了甲烷裂解温度和反应时间对碳纳米管产率的影响,观察分析了碳纳米管微观结构。结果表明:在甲烷还原的Ni基催化剂上,通过化学气相沉积法裂解温度750℃反应40 min,可以得到管径为20 nm左右的碳纳米管;裂解温度对碳纳米管结构影响不大,但过高裂解温度使碳纳米管产率降低。

Carbon nanotubes（CNTs） were prepared by chemical vapor deposition（CVD） over NiO/γ-Al2O3 catalyst to crack methane.The reduction behavior of NiO/γ-Al2O3 catalyst at atmosphere of methane was studied using thermogravimetric method.Moreover,transmission electron microscopy was used to observe and analyze the structural variation of these CNTs.The effects of cracking temperature and reaction time on the yield of CNTs were investigated.The results indicate that CNTs were obtained with diameters about 20 nm.It is found that the cracking temperature influences little on the morphology of CNTs,but a high temperature will lead to low yield of CNTs.