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Nanostructured pure and doped ceria catalysts for gas sensor applications

Saitzek S., Villain S., Fremy M.-A., Leroux C., Nolibe G., Gavarri J.-R.

Inżynieria Materiałowa

2004

R. XXV, nr 3

231-233

For many years, CeO2 -based materials have been used as three-ways catalysts (TWC). They are also of great interest as solid electrolytes. It was already shown that nano-structured powders of cerium dioxide are more sensitive than micronic powders, for the detection of carbon monoxide CO or methane CH4 in air. By doping the cerium dioxide with various elements (Cu, V, Mn, ...), we try to improve the selectivity of the detection. The nanopowders of pure and doped cerium oxide were elaborated from "Sol-Gel" process. The structural characterization of these powders was carried out by X-ray diffraction and transmission electron microscopy. The atom fraction of doping element and the homogeneity of the powders were investigated by Energy Dispersive Spectrometry (EDS) microanalysis techniques. Finally, the catalytic activity was determined from (BET) adsorption techniques, spectrometry IR and electrical measurements involing a homemade device.