Pd Supported on Pr-Rich Cerium-Zirconium-Praseodymium Mixed Oxides for Propane and CO Oxidation
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]]
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Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]
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]]
< Leer menos
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]
Idioma
en
Article de revue
Este ítem está publicado en
Catalysts. 2022, vol. 12, n° 8, p. 827 (19 p.)
MDPI
Resumen en inglés
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 ...Leer más >
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.< Leer menos
Palabras clave en inglés
mixed cerium oxides
emission control
Pd
single-atom catalysts
bulk oxygen mobility
Proyecto ANR
Nouveaux composés pour le stockage de l'oxygène, l'oxydation et la réduction en dépollution automobile - ANR-17-CE08-0022
Orígen
Importado de HalCentros de investigación