Title :

Genesis of active phase in mow/al2o3 hydrotreating catalysts monitored by haadf and in situ qexafs combined to mcr-als analysis

Author(s) :

Nikul'shina, M. S. [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Samara State University [SSAU]
Blanchard, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Lancelot, Christine [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Constant, Anne [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Marinova, Maya [Auteur]
Institut Chevreul - FR2638
Briois, Valerie [Auteur]
Synchrotron SOLEIL [SSOLEIL]
Nikul'shin, P. A. [Auteur]
Samara State University [SSAU]
Lamonier, Carole [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Journal title :

Applied Catalysis B: Environmental

Abbreviated title :

Appl. Catal. B-Environ.

Volume number :

269

Publication date :

2020-07-15

ISSN :

0926-3373

Keyword(s) :

HAADF
MoW catalyst
Time-resolved XAS
Chemometric methods
Sulfidation i ntermediates

HAL domain(s) :

Chimie/Catalyse

English abstract : [en]

Alumina supported MoW hydrotreating catalyst was synthesized by using bimetallic H4[SiMo3W9O40] Keggin heteropolyacid (HPA). Catalysts based on monometallic H4[SiMo12O40] and H4[SiW12O40] and their mixture were also studied. ...
Show more >Alumina supported MoW hydrotreating catalyst was synthesized by using bimetallic H4[SiMo3W9O40] Keggin heteropolyacid (HPA). Catalysts based on monometallic H4[SiMo12O40] and H4[SiW12O40] and their mixture were also studied. Genesis of the active phase was studied during atmospheric gas sulfidation by H2S/H2 of the catalysts by in-situ Quick X-ray absorption spectroscopy (XAS) and High-Angle Annular Dark-Field (HAADF) imaging. The combination of different chemometric tools such as Principal Component Analysis (PCA) and Multivariate Curve Resolution with Alternating Least Squares (MCR-ALS) allowed to determine the number of intermediate species, their chemical nature and concentration profiles during sulfidation. It was found that tungsten sulfidation using bimetallic HPA precursor started at lower temperature, compared to W sulfidation in the monometallic and in the mixture of monometallic HPA catalysts. Simultaneous sulfidation of Mo and W atoms in case of the bimetallic molecular precursor can govern the formation of mixed MoWS2 phase, which formation during activation was evidenced by HAADF.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille

Collections :

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

Research team(s) :

Catalyse pour l’énergie et la synthèse de molécules plateforme (CEMOP)

Submission date :

2022-03-02T07:14:35Z
2024-01-16T10:50:14Z