物理化学学报 >> 2003, Vol. 19 >> Issue (11): 1093-1096.doi: 10.3866/PKU.WHXB20031123

研究简报 上一篇    

W-Fe-MgO催化分解CH4制备单壁碳纳米管

刘霁欣;谢有畅   

  1. 北京大学化学与分子工程学院,北京　100871
  • 收稿日期:2003-03-28 修回日期:2003-07-30 发布日期:2003-11-15
  • 通讯作者: 谢有畅 E-mail:yxie@pku.edu.cn

Single-wall Carbon Nanotubes Produced by Decomposition of CH4 on W-Fe-MgO Catalysts

Liu Ji-Xin;Xie You-Chang   

  1. College of Chemistry and Molecular Engineering, Peking University　100871
  • Received:2003-03-28 Revised:2003-07-30 Published:2003-11-15
  • Contact: Xie You-Chang E-mail:yxie@pku.edu.cn

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摘要： 使用“柠檬酸法”制备了一系列较高比表面的W-Fe-MgO催化剂,在较易放大的流化床反应器中,1 100 ℃ H2气流中分解CH4,制得SWCNTs管束,单管直径在1～3 nm,最高碳产率36 mg/100 mg催化剂.经TEM、微区Raman、程序升温氧化(TPO)测量表明,产物中无定形碳、MWCNTs均较少,为纯度较高、缺陷较少的SWCNTs.从EDAX结果并参考W-Fe相图推测SWCNTs生长的催化剂活性相可能为W、Fe的金属间化合物或富Fe的固溶体.

关键词: 单壁碳纳米管(SWCNTs), W-Fe-MgO, 流化床, CH4分解

Abstract: A series of W-Fe-MgO catalysts with high BET surface area were prepared by mixing Mg(NO3)2•6H2O,ammonium tungstate, citric acid, Fe(NO3)3•9H2O and H2O,followed by drying at 150 ℃ and decomposing at 550 ℃.Using these catalysts, bundled SWCNTs with diameter 1～3 nm for each tube, were synthesized in a fluidized reactor. The maximum yield of SWCNTs was 36 mg/100 mg. TEM, micro-Raman and TPO (temperature programmed oxidation) results showed that the products were SWCNTs of high purity and almost defect-free. From the EDAX results and phase-diagram of W-Fe, we deduced that the active phase for SWCNTs growth was a solid solution or an intermetal compound of tungsten and iron.

Key words: Single-wall carbon nanotubes (SWCNTs), W-Fe-MgO, Fluidized bed,CCH4 decomposition