FAHED, Simon; POINTECOUTEAU, Rémy; AOUINE, M.; BOREAVE, A.; GIL, S.; BAZIN, Philippe; DEMOURGUES, Alain; DATURI, Marco; VERNOUX, P.

doi:10.3390/catal12080827

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FAHED, Simon
IRCELYON-Catalytic and Atmospheric Reactivity for the Environment [CARE]

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, M.
IRCELYON-Microscopie [MICROSCOPIE]

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Article de revue

Ce document a été publié dans

Catalysts. 2022, vol. 12, n° 8, p. 827 (19 p.)

MDPI

Résumé en anglais

The activity of emission control catalysts must be improved in urban mode at low temperatures. One possible way is to tailor the metal-support interaction between platinum group metals (PGMs) and ceria to stabilize small clusters or single atoms, optimizing the utilization of costly PGMs. In this study, a small loading of Pd (<0.2 wt.%) was dispersed on Pr-rich cerium–zirconium–praseodymium mixed oxides (CZP45: Ce0.45Zr0.10Pr0.45O2−x). After the initial calcination at 800 °C, Pd was mainly in the form of dispersed isolated cations which were found to be efficient for low-temperature CO oxidation but inactive for propane combustion. Nevertheless, a pre-reduction step can trigger the formation of Pd nanoparticles and promote the propane oxidation. Pd nanoparticles, formed during the reduction step, coupled with the high oxygen mobility of CZP45, lead to outstanding catalytic activity for propane oxidation starting from 250 °C. However, the re-oxidation of Pd nanoparticles and their partial re-dispersion, promoted by the fast oxygen mobility of the mixed oxide, rapidly deactivate the catalysts in lean conditions.< Réduire

Mots clés en anglais

mixed cerium oxides

emission control

single-atom catalysts

bulk oxygen mobility

DOI

http://dx.doi.org/10.3390/catal12080827

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