Journal
CHEMICAL PAPERS
Volume 69, Issue 2, Pages 316-324Publisher
DE GRUYTER OPEN LTD
DOI: 10.1515/chempap-2015-0029
Keywords
carbon nanotubes; chemical vapour deposition; nickel; transition metals; ethylene
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The incorporation of 1 mass % of group VI metals (chromium, molybdenum, and tungsten) into 4 mass % of Ni/MgO catalysts was evaluated for the synthesis of carbon nanotubes (CNTs) by the catalytic chemical vapour deposition of ethylene. All materials were characterised by XRD, surface area, TEM, SEM, Raman spectroscopy, and TGA-DTA. The resulting data demonstrated that the addition of group VI metals improved the surface area and metal dispersion, thereby achieving a remarkable enhancement in catalytic growth activity. Among the metals of group VI, Mo was found to be the most effective promoter for catalysing the CNTs' growth. From TEM observation, long CNTs with a higher degree of graphitization were obtained on the Ni-Mo/MgO catalyst. TGA and DTA analysis showed that the as-grown CNTs over both Ni-Mo and Ni-W/MgO catalysts exhibited higher thermal stability. (C) 2014 Institute of Chemistry, Slovak Academy of Sciences
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