Table of Contents
ISRN Materials Science
Volume 2012 (2012), Article ID 804763, 9 pages
http://dx.doi.org/10.5402/2012/804763
Research Article

Time-Dependent Oxidative Capacities of , , , and Materials Interacting with Air-CO or Air- Flows

1Institut Matériaux Microélectronique et Nanosciences de Provence (IM2NP), UMR CNRS 6242, Université du Sud Toulon-Var, BP 20132, 83957 La Garde Cedex, France
2Laboratoire Matériaux et Environnement (LME), Faculté des Sciences, Université Ibn Zohr, BP 32/S, Cité Dakhla, Agadir 8106, Morocco

Received 22 August 2012; Accepted 29 September 2012

Academic Editors: I. Imae, G. C. Mather, and R. A. Varin

Copyright © 2012 Bahcine Bakiz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Using Fourier transform infrared (FTIR) spectroscopy analyses, we have studied the oxidation processes of methane or carbon monoxide in air-CH4 or air-CO flows interacting with polycrystalline catalytic oxides, as a function of temperature (T) and time (t). The gas flows crossed through La2O3, Lu2O3, CeO2, or Bi2O3 porous walls with constant composition and rate. The oxidation capacities of materials were determined from the intensities of CO2 vibrational bands resulting from the total oxidation of CH4 or CO into CO2. To interpret the time-dependent variations of these intensities, we have applied a model derived from Johnson-Mehl-Avrami approaches. This simple approach delivers pertinent parameters describing time-dependent oxidation rates.