Titre :

Molecular approach to prepare mixed MoW alumina supported hydrotreatment catalysts using H4SiMonW12−nO40 heteropolyacids

Auteur(s) :

Nikulshina, Maria [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Blanchard, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Mozhaev, Alexander [Auteur]
Lancelot, Christine [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Constant, Anne [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Fournier, Michel [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Payen, Edmond [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Mentre, Olivier [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Briois, Valérie [Auteur]
Synchrotron SOLEIL [SSOLEIL]
Nikulshin, Pavel [Auteur]
Lamonier, Carole [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]

Titre de la revue :

Catalysis Science & Technology

Numéro :

8

Pagination :

5557-5572

Éditeur :

Royal Society of Chemistry (RSC)

Date de publication :

2018-09-12

ISSN :

2044-4753

Discipline(s) HAL :

Chimie/Catalyse
Chimie/Chimie inorganique

Résumé en anglais : [en]

H4[SiMonW12−nO40] heteropolyacids (HPAs) are interesting precursors for the preparation of alumina-supported hydrotreatment catalysts to introduce both metals simultaneously while maintaining a Mo–W nanoscale proximity. ...
Lire la suite >H4[SiMonW12−nO40] heteropolyacids (HPAs) are interesting precursors for the preparation of alumina-supported hydrotreatment catalysts to introduce both metals simultaneously while maintaining a Mo–W nanoscale proximity. Two heteropolyacids (n = 1 and 3) have been synthesized and used for the first time to prepare hydrotreatment catalysts. Crystal structure refinement has been performed and evidenced the formation of β-H4[SiMo3W9O40] with three ordered Mo sites forming a face. The purity of the samples in aqueous solution has been determined by Raman spectroscopy and polarographic characterization. These heteropolyacids were then impregnated on alumina to prepare supported MoW-based catalysts. As references, catalysts with the same Mo/W ratios have been prepared using monometallic H4SiMo12O40 and H4SiW12O40 HPAs (mixture of these 2 HPAs in the impregnating solution). EXAFS characterization after drying performed simultaneously at the Mo K and W LIII edges indicates preservation of the mixed heteropolyanion SiMonW12−nO404− at the alumina surface even if partial decomposition to Keggin lacunary species could not be excluded and evidences the mixed MoW–S2 slab formation after sulfidation. Better catalytic hydrogenation properties for dibenzothiophene hydrodesulfurization and naphthalene hydrogenation have been obtained when using β-H4[SiMo3W9O40], which is explained by the formation of the mixed MoW–S2 active phase.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

ENSCL
Université de Lille
CNRS
Centrale Lille
Univ. Artois

Collections :

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

Équipe(s) de recherche :

Catalyse pour l’énergie (CATEN)
Matériaux inorganiques, structures, systèmes et propriétés (MISSP)

Date de dépôt :

2019-09-25T15:06:58Z
2019-10-25T14:48:53Z
2023-05-04T09:41:28Z