FAHED, Simon; POINTECOUTEAU, Rémy; AOUINE, Mimoun; BOREAVE, Antoinette; GIL, Sonia; MEILLE, Valérie; BAZIN, Philippe; TOULEMONDE, Olivier; DEMOURGUES, Alain; DATURI, Marco; VERNOUX, P.

doi:10.1016/j.apcata.2022.118800

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FAHED, Simon
Institut de recherches sur la catalyse et l'environnement de Lyon [IRCELYON]
Laboratoire catalyse et spectrochimie [LCS]

POINTECOUTEAU, Rémy
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]

AOUINE, Mimoun
Institut de recherches sur la catalyse et l'environnement de Lyon [IRCELYON]

Langue

Article de revue

Ce document a été publié dans

Applied Catalysis A : General. 2022, vol. 644, p. 118800 (11 p.)

Elsevier

Résumé en anglais

This study describes the textural, structural, redox properties, oxygen reactivity of two Pr-rich cerium-zirconium-praseodymium (CZP) oxides (Ce 0.45 Zr 0.10 Pr 0.45 O 2-x and Ce 0.475 Zr 0.05 Pr 0.475 O 2-x) and their catalytic activity for propane and CO oxidation in both stoichiometric and lean conditions, two important reactions for automotive exhaust emission control. The concentration of oxygen vacancies can be tuned by the quantity of Pr 3+ cations which depend both on the preparation method and the composition. The Pr 4+ (4f 1)/Pr 3+ (4f 2) ratio was accurately determined by magnetic measurement. A highly energetic grinding step was found to double this Pr 3+ concentration, resulting in a strong enhancement of the lowtemperature reducibility, bulk oxygen mobility and catalytic activity for propane deep oxidation. Pr-rich CZP oxides seem to be less relevant for CO oxidation, which is mainly driven by the specific surface areas. These Pr-rich CZP mixed oxides present better performances for lean conditions, suggesting their possible role in diesel oxidation catalysts applications.< Réduire

Mots clés en anglais

mixed metal oxides

emission abatement

automotive exhaust control

TWC

oxidation catalysts

DOI

http://dx.doi.org/10.1016/j.apcata.2022.118800

Project ANR

Nouveaux composés pour le stockage de l'oxygène, l'oxydation et la réduction en dépollution automobile - ANR-17-CE08-0022

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026