Title :

Kinetics of methane combustion on model supported Pd/LaxMnO3 natural gas vehicle catalysts: Sensitivity of La-stoichiometry on the catalytic properties of Pd

Author(s) :

Zheng, Yuanshuang [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Marinova, Maya [Auteur]
Institut Chevreul - FR2638
Granger, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]

Journal title :

Chemical Engineering Journal

Abbreviated title :

Chem. Eng. J.

Volume number :

475

Pages :

146389

Publisher :

Elsevier

Publication date :

2023-11-01

ISSN :

1385-8947

English keyword(s) :

Methane combustion
Post-combustion catalysis
Palladium
Perovskite
Kinetics

HAL domain(s) :

Chimie/Catalyse

English abstract : [en]

The kinetics of the catalytic CH4/O2 reaction has been studied on 1 wt% Pd/LaxMnO3 with x = 0.7, 1.0 and 1.3. Steady-state kinetic measurements have been performed in lean conditions at 400 °C on pre-reduced and on aged ...
Show more >The kinetics of the catalytic CH4/O2 reaction has been studied on 1 wt% Pd/LaxMnO3 with x = 0.7, 1.0 and 1.3. Steady-state kinetic measurements have been performed in lean conditions at 400 °C on pre-reduced and on aged catalysts after exposure to wet atmosphere at 750 °C. A single site reaction mechanism occurs preferentially on Pd/La1.3MnO3 exhibiting a La-rich surface. In contrast a dual-site reaction mechanism, combining Pd and surface reactive oxygen species from the support, is preferentially involved on Pd-La0.7MnO3 characterized by a Mn-rich surface. Pd/LaMnO3 exhibits a mixed regime but subsequent deterioration of the Pd-LaxMnO3 interface during thermal aging leads to increasing contribution of the single site reaction mechanism. High surface Pd/Mn ratio and high concentration of Pdn+ with n > 2 can be considered as good descriptors to probe the efficacy of Pd/LaxMnO3 catalysts. Remarkably, the high thermal stability of the Pd-La0.7MnO3 interface, preserving the Pd dispersion on Pd/La0.7MnO3, leads to lower sensitivity to deactivation.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

ANR Project :

Catalyseurs de post-traitement intelligent adaptés à l'usage de carburants alternatifs
Plateforme intégREe AppLiquée au criblage haut débit de CATalyseurs pour les bioraffineries

Other project(s) or funding source(s) :

Région Nord Pas-de-Calais
FEDER

Administrative institution(s) :

Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

Remédiation et matériaux catalytiques (REMCAT)

Submission date :

2024-01-20T00:54:53Z
2024-01-30T14:23:43Z