Electrical behaviour of catalytic nanostructured CeO<sub>2</sub>/CuO<sub>x</sub> composites under air–methane gas impulses - Université d'Artois Accéder directement au contenu
Article Dans Une Revue Applied Surface Science Année : 2007

Electrical behaviour of catalytic nanostructured CeO2/CuOx composites under air–methane gas impulses

Résumé

Nanostructured composites based on copper oxide and cerium dioxide phases [CuO–CeO2] were elaborated from sol–gel route, with weight fractions of CuO phase ranging between 0 and 0.4. They are interesting potential catalysts allowing conversion of CH4 and CO into CO2 and H2O and might be used in miniaturized gas sensors. An electrical study of this nanostructured system was carried out to determine catalytic behaviours under air–methane impulses at 350 °C. The electrical analysis was based on a specific homemade electronic device. Time dependent interactions between gas pulses and solid catalyst (CuO/CeO2) were analyzed from a frequency modification of the electronic device. Kinetic parameters were determined from a model describing adsorption and desorption of gases adapted to short interaction time between gas and solid. These time dependent electrical behaviours were then correlated with infrared spectroscopy analyses allowing time dependent analysis of methane conversion into CO2 gas, for long interaction time between gas and solid.

Domaines

Matériaux

Dates et versions

hal-04641976 , version 1 (09-07-2024)

Identifiants

Citer

Sébastien Saitzek, Sylvie Villain, Gilles Nolibé, Jean Raymond Gavarri. Electrical behaviour of catalytic nanostructured CeO2/CuOx composites under air–methane gas impulses. Applied Surface Science, 2007, 253 (18), pp.7490-7496. ⟨10.1016/j.apsusc.2007.03.040⟩. ⟨hal-04641976⟩
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