Synthesis of multiwalled carbon nanotubes on fly ash derived catalysts

Environmental Science & Technology
O DunensAndrew T Harris

Abstract

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 degrees C 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 (I(G)/I(D) 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 CN...Continue Reading

References

Aug 30, 2005·Journal of Hazardous Materials·Heechan ChoKwanho Kim
Jan 31, 2007·Angewandte Chemie·Dang Sheng Su, Xiao-Wei Chen
Oct 23, 2008·Environmental Science & Technology·Shaobin Wang

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Citations

Mar 26, 2013·Environmental Science & Technology·Liang-Yi Lin, Hsunling Bai
Sep 2, 2014·Nanoscale Research Letters·Nomso HintshoShane Durbach
Jun 21, 2011·Journal of Hazardous Materials·Dilip C D Nath, Veena Sahajwalla
May 31, 2018·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Khavharendwe M RambauMkhulu K Mathe
Oct 24, 2018·Nanomaterials·Wojciech KukułkaEwa Mijowska
Jul 7, 2011·ChemSusChem·Qiang ZhangFei Wei
Sep 21, 2021·Methods : a Companion to Methods in Enzymology·Numan SalahWaleed M Al-Shawafi

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