Tuning the A-site Element in LaCo<sub>0. ...
Type de document :
Article dans une revue scientifique: Article original
DOI :
URL permanente :
Titre :
Tuning the A-site Element in LaCo<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3</sub> Perovskite-based Catalyst for High Temperature N<sub>2</sub>O Decomposition in Nitric Acid Plant
Auteur(s) :
Zheng, P. [Auteur]
He, F. Q. [Auteur]
Wu, Y. H. [Auteur]
Yang, J. H. [Auteur]
Jing, F. L. [Auteur]
Granger, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
He, F. Q. [Auteur]
Wu, Y. H. [Auteur]
Yang, J. H. [Auteur]
Jing, F. L. [Auteur]
Granger, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Titre de la revue :
ChemistrySelect
Nom court de la revue :
ChemistrySelect
Numéro :
9
Pagination :
-
Date de publication :
2024-04-27
ISSN :
2365-6549
Mot(s)-clé(s) en anglais :
Cerium
Strontium
Perovskite
Nitric acid plant
N2O decomposition
Strontium
Perovskite
Nitric acid plant
N2O decomposition
Discipline(s) HAL :
Chimie
Résumé en anglais : [en]
The effect of La-deficiency and Ce/Sr-substitution in the benchmark LaCo0.8Fe0.2O3 has been investigated for the decomposition of N2O between 500 and 900 °C. Real inlet gas composition and space velocity reveal that ...
Lire la suite >The effect of La-deficiency and Ce/Sr-substitution in the benchmark LaCo0.8Fe0.2O3 has been investigated for the decomposition of N2O between 500 and 900 °C. Real inlet gas composition and space velocity reveal that La-deficiency and Ce/Sr-substitution can improve the thermal stability of catalyst, while La1-xSrxCo0.8Fe0.2O3 with x≥0.1 was highlighted as a promising formula due to the strongest resistance to deactivation and suppressed undesired NOx decomposition at high space velocity. This phenomenon is mainly ascribed to the incorporation of Sr2+ into the perovskite lattice during the reaction consequently stabilizing the Co3+ species and creating the oxygen vacancies in La1-xSrxCoO3-δ. On the contrary, the loss of activity on Ce-substituted LaCo0.8Fe0.2O3 has been preferentially related to the cobalt exsolution to extra framework of perovskite making the catalytic cycle with Co3+ unfavorable. All these bulk and surface changes are accompanied with opposite evolution of apparent activation energy and pre-exponential factor which can be discussed based on a redox mechanism.Lire moins >
Lire la suite >The effect of La-deficiency and Ce/Sr-substitution in the benchmark LaCo0.8Fe0.2O3 has been investigated for the decomposition of N2O between 500 and 900 °C. Real inlet gas composition and space velocity reveal that La-deficiency and Ce/Sr-substitution can improve the thermal stability of catalyst, while La1-xSrxCo0.8Fe0.2O3 with x≥0.1 was highlighted as a promising formula due to the strongest resistance to deactivation and suppressed undesired NOx decomposition at high space velocity. This phenomenon is mainly ascribed to the incorporation of Sr2+ into the perovskite lattice during the reaction consequently stabilizing the Co3+ species and creating the oxygen vacancies in La1-xSrxCoO3-δ. On the contrary, the loss of activity on Ce-substituted LaCo0.8Fe0.2O3 has been preferentially related to the cobalt exsolution to extra framework of perovskite making the catalytic cycle with Co3+ unfavorable. All these bulk and surface changes are accompanied with opposite evolution of apparent activation energy and pre-exponential factor which can be discussed based on a redox mechanism.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois
CNRS
Centrale Lille
ENSCL
Univ. Artois
Collections :
Date de dépôt :
2024-05-25T21:09:48Z
2024-06-05T07:26:45Z
2024-06-05T07:26:45Z