Titre :

Bulk hydrotreating MonW12-nS2 catalysts based on SiMonW12-n heteropolyacids prepared by alumina elimination method

Auteur(s) :

Kokliukhin, Aleksandr [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Samara State University [SSAU]
Nikulshina, Maria [Auteur]
Samara State University [SSAU]
Mozhaev, Alexander [Auteur]
Samara State University [SSAU]
Lancelot, Christine [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Lamonier, Carole [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Nuns, Nicolas [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Blanchard, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Bugaev, A. [Auteur]
Southern Federal University [Rostov-on-Don] [SFEDU]
Nikulshin, Pavel [Auteur]
Samara State University [SSAU]

Titre de la revue :

Catalysis Today

Nom court de la revue :

Catal. Today

Numéro :

377

Pagination :

26-37

Éditeur :

Elsevier

Date de publication :

2021-10-01

ISSN :

0920-5861

Discipline(s) HAL :

Chimie/Catalyse

Résumé en anglais : [en]

A series of unsupported mono- and bimetallic MonW12-nS2 catalysts were synthesized by alumina elimination from supported MonW12-nS2/Al2O3 samples using acid etching. Alumina supported catalysts have been in turn prepared ...
Lire la suite >A series of unsupported mono- and bimetallic MonW12-nS2 catalysts were synthesized by alumina elimination from supported MonW12-nS2/Al2O3 samples using acid etching. Alumina supported catalysts have been in turn prepared by using monometallic H4SiMo12O40 and H4SiW12O40 heteropolyacids (HPAs), their mixture with Mo/W atomic ratio equal to 1/11 and 3/9, and mixed bimetallic H4SiMo1W11O40 and H4SiMo3W9O40 HPAs. All catalysts were characterized by N2 adsorption, temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM), time-of-flight secondary ion mass spectrometry (ToF-SIMS), extended X-ray absorption fine structure (EXAFS) spectroscopy and powder X-ray diffraction (XRD) and their performance were evaluated in simultaneous hydrodesulfurization (HDS) of dibenzothiophene (DBT) and hydrogenation (HYD) of naphthalene. The etching process led to a successful removal of all the support and of the partially sulfided species, with sulfidation degrees of both Mo and W above 90 % on the final bulk solids. The active phase also underwent a rearrangement, as higher average length and stacking were measured on the bulk catalysts than on the original supported ones. Mixed MoWS2 phase was evidenced in all solids, prepared from mixed HPAs (MonW12-nS2) or from the mixture of monometallic HPAs (RefMonW12-nS2), by EXAFS and ToF-SIMS, with however a larger quantity on the MoW solids. It seems that the mixed MoWS2 phase observed on the supported MoW catalysts is maintained through the etching process, while on RefMonW12-nS2 the mixed phase, observed in a much lesser extent in the corresponding supported catalyst, could result from the aggregation of the monometallic slabs. MonW12-nS2 catalysts were found more effective than the monometallic catalysts and than the corresponding RefMonW12-nS2, in both dibenzothiophene hydrodesulfurization and naphthalene hydrogenation, which was related to the presence of the mixed phase maintained through the etching of the support.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)

Date de dépôt :

2022-03-24T09:02:31Z
2023-05-04T13:03:32Z
2023-11-14T13:57:53Z