Titre :

Catalytic Ammonia Synthesis by Supported Molybdenum Nitride: Insight into the Support Effect

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]
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Marinova, Maya [Auteur]
Institut Michel Eugène Chevreul - FR 2638 [IMEC]
Dacquin, Jean-Philippe [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Laassiri, S. [Auteur]
Université Mohammed VI Polytechnique = Mohammed VI Polytechnic University [Ben Guerir] [UM6P]
Royer, sebastien [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]

Titre de la revue :

ChemCatChem

Nom court de la revue :

ChemCatChem

Numéro :

e202400494

Pagination :

-

Date de publication :

2024-11-30

ISSN :

1867-3880

Mot(s)-clé(s) en anglais :

Ammonia decomposition
Ammonia synthesis
Molybdenum nitride
Nanoparticles
SMSI effect

Discipline(s) HAL :

Chimie/Chimie théorique et/ou physique

Résumé en anglais : [en]

The influence of the support on the performance of Mo nitrides has been investigated in ammonia synthesis and decomposition. A series of Mo–N catalysts supported on different materials, namely SiO2 (commercial, SBA-15), ...
Lire la suite >The influence of the support on the performance of Mo nitrides has been investigated in ammonia synthesis and decomposition. A series of Mo–N catalysts supported on different materials, namely SiO2 (commercial, SBA-15), Al2O3, and CeO2, were prepared. The results indicated that, despite the high dispersion of Mo species in all catalysts, large disparities in the activity for ammonia synthesis exist. Initial rates of ∼1208, ∼481, and ∼372 µmol gactive phase−1 h−1 are obtained over 10-Mo–N/SBA-15, 10-Mo–N/SiO2, and 10-Mo–N/Al2O3 respectively. However, no catalytic activity was registered when Mo species were supported on CeO2. Furthermore, 10-Mo–N/Al2O3 deactivated after few hours of reaction. The surface composition was studied by means of XPS to probe the origin of the catalytic activity differences, and the results indicated that a range of various oxidation states of Mo was detected depending on the support. The difference in catalytic behavior could not be solely explained by the differences in Mo–N species concentrations. In situ EPR analysis exhibited that the mechanism of MoO3 nitridation could differ depending on the support, leading to the formation of different Mo–N species. The effect of support was, however, not as severe in ammonia decomposition as it was the case of ammonia synthesis.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS

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

Date de dépôt :

2024-12-02T22:00:36Z
2024-12-11T08:58:50Z
2024-12-11T09:01:43Z