物理化学学报 >> 2003, Vol. 19 >> Issue (04): 347-351.doi: 10.3866/PKU.WHXB20030414

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气凝胶催化剂上甲烷裂解制备的碳纳米管结构特征

朴玲钰;李永丹   

  1. 天津大学化工学院催化科学与工程系,天津　300072
  • 收稿日期:2002-09-18 修回日期:2002-11-12 发布日期:2003-04-15
  • 通讯作者: 李永丹 E-mail:ydli@tju.edu.cn

Structure of Carbon Nanotubes from Decomposition of Methane on an Aerogel Catalyst

Piao Ling-Yu;Li Yong-Dan   

  1. Department of Catalysis Science and Technology, School of Chemical Engineering, Tianjin University, Tianjin　300072
  • Received:2002-09-18 Revised:2002-11-12 Published:2003-04-15
  • Contact: Li Yong-Dan E-mail:ydli@tju.edu.cn

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摘要： 采用XRD、TGA、SEM、TEM、 Raman光谱等多种表征手段,考察了Al2O3气凝胶催化剂上甲烷裂解生长的碳纳米管的结构特征.制得的碳纳米管形态单一,为管径均匀、管壁光滑的中空纳米管,平均直径在10～20 nm.碳纳米管的比表面积较大,具有较强的抗氧化能力,其结构的长程有序度较石墨低.由碳纳米管的Raman光谱分析可知,碳纳米管存在碳层缺陷和无定形碳.当反应温度升高或甲烷浓度下降时,碳纳米管石墨化程度逐渐提高.

关键词: 超临界干燥, 气凝胶催化剂, 甲烷裂解, 碳纳米管, Raman光谱

Abstract: Carbon nanotubes were prepared from catalytic decomposition of methane on an aerogel catalyst. The structure of carbon nanotubes was characterized by XRD,TGA,SEM,TEM and Raman spectroscopic methods. The carbon nanotubes grown on the aerogel catalysts are hollow with smooth wall and even diameters. The average diameter of the tubes is in the range of 10～20 nm. The nanotubes obtained in this work have a large surface area and a good oxygen resistance. From the Raman spectra of carbon nanotubes grown on the aerogel catalysts, it was observed that the nanotubes prepared with this method contained defects in the graphene layers and contained amorphous carbon. Carbon species become more graphitic when reaction temperature increases or concentration of methane decreases.

Key words: Supercritical drying, Aerogel catalyst, Decomposition of methane, Carbon nanotubes, Raman spectroscopy