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Article Dans Une Revue ACS Applied Nano Materials Année : 2021

Nanoporous CeO 2 –ZrO 2 Oxides for Oxidation of Volatile Organic Compounds

Florian Jonas
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Jean-Luc Blin

Résumé

Here, mixed nanostructured ceria/zirconia oxides have been prepared either by wet impregnation on nanostructured ZrO2 or by co-condensation through an evaporation-induced self-assembly (EISA)-derived pathway. This latter method and impregnation on amorphous ZrO2, followed or not by heating at 480 °C, lead to a uniform cerium distribution in the zirconia framework, and solid solutions are formed. Stabilization of the tetragonal structure of nano-ZrO2 with the increase of the cerium content is observed by X-ray diffraction (XRD) and Raman spectroscopy. The surface Ce/Zr molar ratio determined by X-ray photoelectron spectrometry (XPS) is very close to the bulk one, calculated from the X-ray fluorescence analysis. In contrast to the appearance of nanosized ceria particles with the increase of the cerium content, a monoclinic/tetragonal mixture and enrichment of the surface in cerium are noted if the impregnation is carried out on nanostructured ZrO2 previously calcined at 480 °C. The obtained catalysts have been tested for the oxidation of toluene, used as a model volatile organic compound. The catalytic efficiency of the mixed oxides has also been compared to that of pure commercial ceria. Results show that the preparation method has a significant effect on the catalytic properties of the materials. Although pure ceria presents the best activity and selectivity, the nanostructured ZrO2 previously calcined at 480 °C and impregnated by 10 mol % CeO2 is almost as efficient as pure ceria.
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Dates et versions

hal-03162218 , version 1 (08-03-2021)

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Florian Jonas, Bénédicte Lebeau, Stéphane Siffert, Laure Michelin, Christophe Poupin, et al.. Nanoporous CeO 2 –ZrO 2 Oxides for Oxidation of Volatile Organic Compounds. ACS Applied Nano Materials, 2021, 4 (2), pp.1786-1797. ⟨10.1021/acsanm.0c03212⟩. ⟨hal-03162218⟩
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