Titre :

The effect of the Mo/W ratio on the catalytic properties of alumina supported hydrotreating catalysts prepared from mixed SiMo6W6 and SiMo9W3 heteropolyacids

Auteur(s) :

Kokliukhin, A. [Auteur]
Nikulshina, M. [Auteur]
Mozhaev, A. [Auteur]
Lancelot, Christine [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Blanchard, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Mentre, Olivier [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Marinova, Maya [Auteur]
Institut Chevreul - FR2638
Lamonier, Carole [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Nikulshin, P. [Auteur]

Titre de la revue :

Catalysis Today

Nom court de la revue :

Catalysis Today

Numéro :

377

Pagination :

100-113

Date de publication :

2021-10

ISSN :

09205861

Mot(s)-clé(s) en anglais :

Hydrodesulfurization
hydrogenation
SiMonW12-n HPA
MoW mixed phase
DBT

Discipline(s) HAL :

Chimie/Catalyse
Chimie/Chimie inorganique

Résumé en anglais : [en]

New mixed H4[SiMonWn-12O40] (n = 6 and 9) Keggin type heteropolyacids (HPAs) have been successfully synthesized, as confirmed by single-crystal XRD, Raman and IR spectroscopy analysis. The resulting polyoxometallates were ...
Lire la suite >New mixed H4[SiMonWn-12O40] (n = 6 and 9) Keggin type heteropolyacids (HPAs) have been successfully synthesized, as confirmed by single-crystal XRD, Raman and IR spectroscopy analysis. The resulting polyoxometallates were used for preparation of hydrotreatment catalysts. Mo(W)/Al2O3 catalysts were synthesized by incipient wetness impregnation of alumina support with water solutions of prepared mixed Keggin HPAs and corresponding counterparts based on mixture of monometallic H4[SiMo12O40] and H4[SiW12O40] HPAs. Oxidic catalysts were analyzed by Raman spectroscopy to determine the precursor structure after deposition. Catalysts in sulfided state were characterized by high-resolution transmission electron microscopy (HRTEM), high angle annular dark field imaging (HAADF) and X-ray photoelectron spectroscopy (XPS) and were tested in co-hydrotreating of dibenzothiophene (DBT) and naphthalene. The use of new mixed Keggin HPAs made it possible to obtain catalysts with mixed MoWS2 active centers, which was confirmed by HAADF. Moreover, the Mo/(Mo+W) ratio has a direct effect on the structure of the active phase species. An ordered core-shell structure with Mo atoms in the core is maintained until the fraction of molybdenum in mixed MoW/Al2O3 catalyst exceeds 50%, where a more disordered structure is observed. Moreover, this Mo/(Mo+W) ratio of 0.5 is optimal to achieve a maximum catalytic activity. Indeed, the turnover frequencies (TOF) of the MoWS2 edge centers with random atoms distribution in a cluster as in Mo9W3/Al2O3, was lower compared to that of Mo6W6/Al2O3 with core-shell structure.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille

Collections :

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

Équipe(s) de recherche :

Catalyse pour l’énergie et la synthèse de molécules plateforme (CEMOP)
Matériaux inorganiques, structures, systèmes et propriétés (MISSP)
Catalyse pour l’énergie et la synthèse de molécules plateforme (CEMOP)

Date de dépôt :

2022-03-24T09:02:29Z
2023-11-09T08:53:14Z
2023-11-24T09:52:00Z