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Synthesis of Multiwalled Carbon Nanotubes on Fly Ash Derived Catalysts

机译：粉煤灰衍生催化剂合成多壁碳纳米管

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摘要

Carbon nanotubes (CNTs) are an allotrope of carbon with unique properties that make them potentially useful in a vast range of applications. However, CNTs are predominantly produced using expensive and/or nonrecyclable catalyst supports, e.g., mesoporous silica and alumina. In this work, coal combustion fly ash, a bulk waste product with limited uses, was impregnated with iron nitrate and successfully used as a substrate to produce industrial grade multiwalled carbon nanotubes (MWNTs) by fluidized bed chemical vapor deposition. CNTs were analyzed using thermogravimetric analysis, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy. The most successful catalyst trialed at 650 ℃ using ethylene as a carbon source was a 5 wt % Fe fly ash catalyst, which produced a CNT yield in respect to metal loading of approximately 82.5%. The MWNTs had outer diameters of between 12 and 20 nm with a reasonable degree of wall graphitization (l_G/l_0 of 1.17). Advantages of utilizing fly ash as a catalyst support are its availability at low cost at the megaton scale, its high thermal stability, and suitability for use in industrial fluidized bed reactors. Potential applications for the fly ash produced CNTs include use in composite materials.
机译：碳纳米管（CNTs）是碳的同素异形体，具有独特的特性，使它们有可能在广泛的应用中有用。但是，CNT主要使用昂贵和/或不可回收的催化剂载体例如中孔二氧化硅和氧化铝来生产。在这项工作中，煤燃烧粉煤灰（一种用途有限的散装废物）被硝酸铁浸渍，并成功地用作通过流化床化学气相沉积法生产工业级多壁碳纳米管（MWNT）的基质。使用热重分析，拉曼光谱，扫描电子显微镜和透射电子显微镜对CNT进行分析。在650℃下使用乙烯作为碳源进行试验的最成功的催化剂是5 wt％的铁粉煤灰催化剂，相对于金属负载量，其产生的CNT产率约为82.5％。 MWNT的外径在12至20nm之间，并且壁石墨化程度合理（l_G / l_0为1.17）。利用粉煤灰作为催化剂载体的优点是其可以以百万吨级的规模以低成本获得，其高的热稳定性以及适用于工业流化床反应器中。粉煤灰生产的碳纳米管的潜在应用包括用于复合材料。

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  • 来源
    《Environmental Science & Technology》 |2009年第20期|7889-7894|共6页
  • 作者

    OSCAR M. DUNENS; KIERAN J. MACKENZIE; ANDREW T. HARRIS;

  • 作者单位

    Laboratory for Sustainable Technology, School of Chemical and Biomolecular Engineering, The University of Sydney, NSW, 2006, Australia;

    Laboratory for Sustainable Technology, School of Chemical and Biomolecular Engineering, The University of Sydney, NSW, 2006, Australia;

    Laboratory for Sustainable Technology, School of Chemical and Biomolecular Engineering, The University of Sydney, NSW, 2006, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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