Title :

Hierarchical porous epsilon-MnO2 from perovskite precursor: application to the formaldehyde total oxidation

Author(s) :

Xu, Yin [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Wuhan University [China]
Dhainaut, Jeremy [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Rochard, Guillaume [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Dacquin, Jean-Philippe [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Mamede, Anne-Sophie [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Giraudon, Jean-Marc [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Lamonier, Jean-Francois [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Zhang, Hui [Auteur]
Wuhan University [China]
royer, sebastien [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]

Journal title :

Chemical engineering journal (Lausanne, Switzerland . 1996)

Abbreviated title :

Chem. Eng. J.

Volume number :

388

Publisher :

Elsevier

Publication date :

2020-05-15

ISSN :

1385-8947

Keyword(s) :

Hierarchical epsilon-MnO2
Perovskite acid treatment
Formaldehyde oxidation
Heterogeneous catalysis
Pseudomorphic process

HAL domain(s) :

Chimie/Catalyse

English abstract : [en]

A simple template-free method, based on a mineral acid etching process using manganite perovskite (LaMnO3) as precursor, was successfully developed to obtain a series of 3D meso/macro-porous materials. The LaMnO3 transformation ...
Show more >A simple template-free method, based on a mineral acid etching process using manganite perovskite (LaMnO3) as precursor, was successfully developed to obtain a series of 3D meso/macro-porous materials. The LaMnO3 transformation was fully investigated using ICP, XRD, N2 physisorption, TPR, TPD, SEM, TEM/EDS and XPS. This transformation proceeds through a soft-chemical process involving the dissolution of trivalent lanthanum and manganese from the perovskite structure and the dismutation of Mn3+ cations into MnO2 and Mn2+ species. Strength and oxidizing properties of the acid used as modifying agent strongly impact textural and redox surface properties of the resulting materials. Specifically, extending the acid etching duration promotes the surface area and pore volume of the materials while developing interconnected macro-mesoporous networks. In our case, this soft process allowed us to obtain the ε-MnO2 phase with hierarchical porosity without any template. Superior catalytic properties of ε-MnO2 were observed toward HCHO oxidation as well as a good catalytic stability with respect to other macro-mesoporous counterparts. In the light of the experimental results, such performances can be related to the formation of a meso/macro porous structure conferring high surface area and good accessibilityShow less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille

Collections :

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

Research team(s) :

Matériaux pour la catalyse (MATCAT)
Remédiation et matériaux catalytiques (REMCAT)

Submission date :

2022-03-02T07:14:47Z
2023-03-23T12:28:13Z
2023-03-24T13:55:23Z
2023-03-24T13:59:46Z
2023-03-24T14:04:23Z