Abstract
In this work, the Catalytic Chemical Vapor Deposition (CCVD) technique was used to synthesize carbon nanotubes (CNT). Natural gas (NG) was employed as a carbon source for the growing of CNT, while magnesium oxide was used as a catalyst support for the nanotubes synthesis. Two systems were utilized. The Fe–Mo/MgO system was obtained by the impregnation technique through the dispersion of iron oxide, which is the catalyst, over magnesia (with molybdenum additions). This system was tested intending to optimize the parameters for the production of single-walled carbon nanotubes (SWCNT). Moreover, Mg1−x Fe x MoO4, which was prepared by the combustion synthesis method, was tested to produce multi-walled carbon nanotubes (MWCNT). The Fe-Mo/MgO tests were carried out under H2/GN and Ar/GN atmospheres at 950 °C, whereas the Mg1−x Fe x MoO4 was submitted to 1,000 °C under H2/GN atmosphere. The Fe–Mo/MgO catalyst produced better results regarding number of CNT and their diameters under Ar/NG atmospheres than under H2/NG atmospheres. The system Mg1−x Fe x MoO4 produced MWCNT according to the expectations.
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Acknowledgements
Authors are grateful to the members of Laboratory of Ceramic Materials (LACER) for their contribution to the development of this study, to the CME/UFRGS (Electron Microscopy Center of the Federal University of Rio Grande do Sul) staff, who made the SEM and TEM analysis possible, and to the High Pressures Laboratory of the UFRGS Physics Institute personnel.
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Bonadiman, R., Lima, M.D., de Andrade, M.J. et al. Production of single and multi-walled carbon nanotubes using natural gas as a precursor compound. J Mater Sci 41, 7288–7295 (2006). https://doi.org/10.1007/s10853-006-0938-2
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DOI: https://doi.org/10.1007/s10853-006-0938-2