Titre :

Switching on/off molybdenum nitride catalytic activity in ammonia synthesis through modulating metal-support interaction.

Auteur(s) :

Sfeir, Amanda [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Abreu Teles, Camila [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Marinova, Maya [Auteur]
Institut Chevreul - FR2638
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Dacquin, Jean-Philippe [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Löfberg, Axel [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Laassiri, S. [Auteur]
Royer, sebastien [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]

Titre de la revue :

Faraday Discuss

Date de publication :

2023-04-15

ISSN :

1364-5498

Discipline(s) HAL :

Chimie/Catalyse

Résumé en anglais : [en]

Modulating the interaction between Mo nanoparticles and their support is an elegant approach to finely tune the structural, physico-chemical, redox and electronic properties of the active site. In this work, a series of ...
Lire la suite >Modulating the interaction between Mo nanoparticles and their support is an elegant approach to finely tune the structural, physico-chemical, redox and electronic properties of the active site. In this work, a series of molybdenum nitride catalysts supported on TiO2, and SBA-15 has been prepared and fully characterized. The results of characterization confirmed the high dispersion of Mo and the formation of small molybdenum nanoparticles in both the 10-Mo-N/SBA-15 and 10-Mo-N/TiO2 catalysts. In this context, we have shown that the catalytic activity of Mo species was strongly impacted by the nature of the catalytic support. Amongst the studied supports, SBA-15 was found to be the most appropriate for Mo dispersion. In comparison, when supported on a reducible oxide (TiO2), Mo species showed poor catalytic activity in both ammonia synthesis and decomposition and were prone to quick deactivation in the ammonia synthesis reaction. Evidence of charge transfer from the reducible support to the active phase, indicative of possible SMSI behaviour, has been observed by XPS and EPR. Differences in the oxidation states, redox behaviours, and electronic properties have been further studied by means of EPR, H2-TPR and H2-TPD.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Équipe(s) de recherche :

Matériaux pour la catalyse (MATCAT)
Propriétés magnéto structurales des matériaux (PMSM)
Valorisation des alcanes et de la biomasse (VAALBIO)

Date de dépôt :

2023-04-24T04:06:29Z
2023-05-02T07:58:23Z
2023-05-02T08:08:26Z
2023-06-23T09:04:59Z
2023-09-13T12:23:25Z