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An investigation of carbon nanotubes obtained from the decomposition of methane over reduced Mg1− xM xAl2O4 spinel catalysts

Govindaraj, Achutharao and Flahaut, Emmanuel and Laurent, Christophe and Peigney, Alain and Rousset, Abel and Rao, Chintamani Nagesa Ramachandra An investigation of carbon nanotubes obtained from the decomposition of methane over reduced Mg1− xM xAl2O4 spinel catalysts. (1999) Journal of Materials Research, 14 (6). 2567-2576. ISSN 0884-2914

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Official URL: http://dx.doi.org/10.1557/JMR.1999.0344

Abstract

Carbon nanotubes produced by the treatment of Mg1−xMxAl2O4 (M = Fe, Co, or Ni; x = 0.1, 0.2, 0.3, or 0.4) spinels with an H2–CH4 mixture at 1070 °C have been investigated systematically. The grains of the oxide-metal composite particles are uniformly covered by a weblike network of carbon nanotube bundles, several tens of micrometers long, made up of single-wall nanotubes with a diameter close to 4 nm. Only the smallest metal particles (<5 nm) are involved in the formation of the nanotubes. A macroscopic characterization method involving surface area measurements and chemical analysis has been developed in order to compare the different nanotube specimens. An increase in the transition metal content of the catalyst yields more carbon nanotubes (up to a metal content of 10.0 wt% or x = 0.3), but causes a decrease in carbon quality. The best compromise is to use 6.7 wt% of metal (x = 0.2) in the catalyst. Co gives superior results with respect to both the quantity and quality of the nanotubes. In the case of Fe, the quality is notably hampered by the formation of Fe3C particles.

Item Type:Article
Additional Information:Thanks to Cambridge University Press editor. The definitive version is available at http://journals.cambridge.org The original PDF of the article can be found at Journal of Materials Research website : http://dx.doi.org/10.1557/JMR.1999.0344
HAL Id:hal-01102341
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Jawaharlal Nehru Centre for Advanced Scientific Research - JNCASR (INDIA)
Laboratory name:
Funders:
Indo-French Centre for the Promotion of Advanced Research (New Delhi)
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Deposited By: cirimat webmestre
Deposited On:10 Mar 2014 10:34

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