Title :

Calcium and copper substitution in stoichiometric and La-deficient LaFeO3 compositions: A starting point in next generation of Three-Way-Catalysts for gasoline engines

Author(s) :

Wu, Jianxiong [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Dacquin, Jean-Philippe [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Djelal, Nora [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
CORDIER, Catherine [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Dujardin, Christophe [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Granger, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]

Journal title :

Applied Catalysis B: Environmental

Volume number :

282

Pages :

119621

Publisher :

Elsevier BV

Publication date :

2021-03

ISSN :

0926-3373

English keyword(s) :

Perovskites
Three-Way-Catalyst
La-deficient La1-xFeO3
Dual calcium copper substitution
CO and propene oxidation

HAL domain(s) :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]

English abstract : [en]

Calcium and copper substitutions, in A-site and B-site respectively, of parent stoichiometric LaFeO3 and La-deficient La0.7FeO3 perovskites led to significant improvements in the kinetics of CO and propene oxidation in ...
Show more >Calcium and copper substitutions, in A-site and B-site respectively, of parent stoichiometric LaFeO3 and La-deficient La0.7FeO3 perovskites led to significant improvements in the kinetics of CO and propene oxidation in typical three-way operating conditions. La-deficient La0.7Fe1-yCuyO3 perovskites were found more prone to surface copper oxide segregation leading to more active extra-framework copper oxide species in CO oxidation. Optimal performances were obtained on La0.7Fe0.8Cu0.2O3 composition. At higher Cu content, strong copper agglomeration leads to deactivation. More stable systems were obtained on dual substituted samples thanks to calcium substitution stabilizing copper inside the perovskite lattice and slowing down subsequent surface agglomeration. Rate enhancements in propene oxidation is observed on A-site deficient La0.6CaxFe0.8Cu0.2O3 with x ≤ 0.2 but a sharp loss in rate is observed on stoichiometric La0.6Ca0.4Fe0.8Cu0.2O3 perovskite explained by a progressive shift from suprafacial to intrafacial mechanism involving in this latter case the redox Fe4+/Fe3+ couple and lattice oxygen species.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Métallurgie Physique et Génie des Matériaux
Matériaux pour la catalyse (MATCAT)
Remédiation et matériaux catalytiques (REMCAT)

Submission date :

2021-04-19T11:59:17Z
2021-04-30T13:45:04Z