Title :

Tuning the A-site Element in LaCo_0.8Fe_0.2O₃ Perovskite-based Catalyst for High Temperature N₂O Decomposition in Nitric Acid Plant

Author(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

Journal title :

ChemistrySelect

Abbreviated title :

ChemistrySelect

Volume number :

9

Pages :

-

Publication date :

2024-04-27

ISSN :

2365-6549

English keyword(s) :

Cerium
Strontium
Perovskite
Nitric acid plant
N2O decomposition

HAL domain(s) :

Chimie

English abstract : [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 ...
Show more >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.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois

Collections :

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

Submission date :

2024-05-25T21:09:48Z
2024-06-05T07:26:45Z