纳米铁催化剂制备及裂解甲烷生长小直径碳纳米管  

Preparation of Nanosized Iron Catalyst and Small Diameter Carbon Nanotubes from Methane Decomposition

作　　者：骞伟中[1] 陈理[1] 张强[1] 魏飞[1] 凌晨[1] 汪展文[1] 

机构地区：[1]清华大学化工系,北京市绿色反应工程与工艺重点实验室,北京100084

出　　处：《过程工程学报》2006年第z2期294-297,共4页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:20606020;20236020);全国优秀博士论文专项基金(编号:200548);中石化创新基金(编号:X503022)

摘　　要：在利用化学气相沉积法裂解甲烷制备碳纳米管的过程中,通过改变催化剂组成,溶液过饱和度,焙烧温度等,优化了利用液相共沉淀法制得的纳米铁催化剂.催化剂的晶粒随着铁铝比及焙烧温度的提高而增大,随着溶液过饱和度的增加而降低.在众多的影响因素中,XRD表征证实,焙烧温度对催化剂的晶粒尺寸影响最显著.利用低温焙烧的催化剂,具有良好的活性,生成了大量细而长的小直径(5～8nm)碳纳米管.碳纳米管的生长过程遵守直径依赖催化剂晶粒粒径的关系.这些结果对控制制备碳纳米管指导意义.In the process of chemical vapor deposition to produce carbon nanotubes as decomposing methane,the nanosized iron catalyst has been prepared by the co-precipitation method and optimized as tailoring the concentration of iron nitrate solution,ratio of iron to alumina and calcination temperature.The crystallite size of catalyst increases with the ratio of iron to alumina,calcination temperature,but decreases with the concentration of iron nitrate solution.Among these factors,the crystallite size is mostly influenced by the temperature,as characterized by XRD.Based on the catalyst calcinated under low temperature,large amount of carbon nanotubes with small diameter(5～8 nm) and narrow diameter distribution has been produced,following the relationship between the diameter of carbon nanotubes and the size of the catalyst.The result is useful for the controlled production of carbon nanotubes.

关 键 词：碳纳米管 纳米催化剂 甲烷裂解 

分 类 号：TB383[一般工业技术—材料科学与工程]