Fe/Mo/Al_2O_3催化剂热解火焰法合成小直径少壁碳纳米管:催化剂焙烧与还原温度的影响  

Pyrolysis Flame Synthesis of Small-diameter and Fewer-walled Carbon Nanotubes on Fe/Mo/Al_2O_3 Catalysts:Effects of the Catalyst Calcination and Reduction Temperature

作　　者：孙保民[1] 贾斌[1] 郭永红[1] 丁兆勇[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,北京102206

出　　处：《人工晶体学报》2011年第2期459-464,共6页Journal of Synthetic Crystals

基　　金：中央高校基本科研业务费专项资金资助

摘　　要：采用Fe/Mo/Al2O3载体载入式催化剂,以CO为碳源,通过氧炔焰形成热解火焰合成了小直径少壁碳纳米管。分别对不同的催化剂焙烧温度,催化剂预先还原温度进行了对比分析。研究发现900℃的焙烧温度可以有效减小催化剂颗粒尺寸,优化颗粒尺寸的统一性以及在载体表面分散的均匀性;400℃的还原温度可以在防止被还原成的铁单质颗粒聚合长大,失去合成小直径少壁碳纳米管所必须的小尺寸的基础上,有效还原颗粒氧化物使其尺寸进一步减小并分散更加均匀。Flame synthesis of carbon nanotubes（CNTs） with small diameter and fewer walls was synthesized using substrate-support catalyst Fe/Mo/Al2O3 and CO as carbon source via oxyacetylene pyrolysis flame.To study the effects of every catalyst operation on synthesis result,different catalysts calcination temperatures and reduction temperatures were analyzed contrastively in this work.The results indicated that a calcination temperature of 900 ℃ could reduce the size of catalyst particles effectively,facilitate size unity and dispersing uniformity on substrate.On the basis of preventing elemental iron particles formed via reduction from polymerizing to large size then losing small size characteristics necessary to synthesize carbon nanotubes with small diameter and fewer walls a reduction temperature of 400 ℃ can effectively reduce oxide particles size and facilitate their dispersing uniformity further through reduction.

关 键 词：碳纳米管 载体催化剂 热解火焰 焙烧 还原温度 

分 类 号：TN304[电子电信—物理电子学]