Titre :

Unraveling Oxidation and Spin States of a Single Fe-Based Meso-Macroporous Silica Catalyst in Fenton-like Reaction by Magnetic Measurements

Auteur(s) :

Bellouard, Christine [Auteur]
Institut Jean Lamour [IJL]
Kim, Sanghoon [Auteur]
Laboratoire Lorrain de Chimie Moléculaire [L2CM]
Ghanbaja, Jaafar [Auteur]
Institut Jean Lamour [IJL]
Wojcieszak, Robert [Auteur]
Laboratoire Lorrain de Chimie Moléculaire [L2CM]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Canilho, Nadia [Auteur]
Laboratoire Lorrain de Chimie Moléculaire [L2CM]
Pasc, Andreea [Auteur]
Laboratoire Lorrain de Chimie Moléculaire [L2CM]

Titre de la revue :

Journal of Physical Chemistry C

Nom court de la revue :

J. Phys. Chem. C

Numéro :

128

Pagination :

8449–8457

Éditeur :

American Chemical Society (ACS)

Date de publication :

2024-05-11

ISSN :

1932-7447

Mot(s)-clé(s) en anglais :

Catalysts
Iron
Magnetic properties
Quantum mechanics
Silica

Discipline(s) HAL :

Chimie/Catalyse

Résumé en anglais : [en]

Single-atom catalysts are acknowledged for their superior efficiency compared to nanoparticles or clusters, primarily because of the enhanced accessibility of the catalytic center. Essential parameters for assessing their ...
Lire la suite >Single-atom catalysts are acknowledged for their superior efficiency compared to nanoparticles or clusters, primarily because of the enhanced accessibility of the catalytic center. Essential parameters for assessing their performance are the metal loading degree and oxidation state of the individual catalytic sites. This is particularly the case in Fe-based Fenton-like reaction, in which both Fe2+ and Fe3+ are active but react with significantly different catalytic rates. While the elemental metal loading can be easily assessed by elemental analysis, the determination of the oxidation degree is more challenging. To do so, we designed single Fe-based meso-macroporous silica materials as catalysts for the degradation of methylene blue, an organic dye serving as a well-known model for the degradation of organic pollutants in wastewater. The silica materials were successfully synthesized by a sol–gel process through a combined templating mechanism with micelles and solid lipid nanoparticles of Fe-based surfactants. Magnetic measurements have revealed that half of the iron centers are in the Fe2+ state. The tracking of the Fenton like reaction through magnetic measurements agrees with the contribution of Fe2+ in the catalytic process. The magnetic response emerges as a valuable tool for quantifying and characterizing individual catalytic centers.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois

Collections :

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

Équipe(s) de recherche :

Valorisation des alcanes et de la biomasse (VAALBIO)

Date de dépôt :

2024-06-12T21:02:07Z
2024-06-17T10:54:35Z