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Electrical properties and reactivity under air–CO flows of composite systems based on ceria coated carbon nanotubes

David, Marjorie and Arab, Madjid and Guinneton, Frédéric and Flahaut, Emmanuel and Bakiz, Bahcine and Nowakowski, Pawel and Gavarri, Jean Raymond Electrical properties and reactivity under air–CO flows of composite systems based on ceria coated carbon nanotubes. (2011) Chemical Engineering Journal, 171 (1). 272-278. ISSN 1385-8947

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Official URL: http://dx.doi.org/10.1016/j.cej.2011.03.079

Abstract

Nanocomposite systems of ceria nanoparticles and Double Walled Carbon Nanotubes (DWNTs) coated with nanoceria (nCeO2) were elaborated using a classical sol gel method. Three samples noted as [nCeO2 + xDWNTs] with variable weight fractions x = 0, 5 and 15 wt.% of DWNTs were obtained. The samples were characterized by Xray diffraction and electron microscopy. The electrical conductivity of [nCeO2 + xDWNTs] compacted pellets systems was determined from electrical impedance spectrometry, under air, between 120 and 400 °C. In this temperature range, all samples were semiconducting with a weak variation of activation energy. However, the conductivity strongly increased with the weight fraction of ceria coated carbon nanotubes. Finally, the solid–gas interactions between air–CO flows and these systems were studied as a function of time and temperature, by means of Fourier transform infrared (FTIR) spectroscopy. The oxidation kinetics of CO into CO2 was analyzed from the evolutions of FTIR absorption band intensities. As the carbon nanotube fraction x increased, the conversion efficiency was strongly improved.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com/science/article/pii/S1385894711004050
HAL Id:hal-00857438
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 > Université du Sud Toulon-Var - USTV (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:25 Jul 2013 07:37

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