Loading…

EXAFS Characterization of New Active Phases for Catalytic Hydrotreatment: Two Cations Disulfide Layers in the MoxW(1-x)S2 Lamellar Solid Solution

Synchrotron and Neutron Solutions to Oil Industry ProblemBulk and alumina-supported Mo0.5W0.5S2 compounds were prepared. The presence of both molybdenum and tungsten in every [MS2] layer (intralayer solid solution) was evidenced using EXAFS spectroscopy, the only local method which can provide such...

Full description

Saved in:
Bibliographic Details
Published in:Oil & gas science and technology 2005-09, Vol.60 (5), p.781-790
Main Authors: Thomazeau, C., Geantet, C., Lacroix, M., Danot, M., Harle, V.
Format: Article
Language:English
Subjects:
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Synchrotron and Neutron Solutions to Oil Industry ProblemBulk and alumina-supported Mo0.5W0.5S2 compounds were prepared. The presence of both molybdenum and tungsten in every [MS2] layer (intralayer solid solution) was evidenced using EXAFS spectroscopy, the only local method which can provide such relevant structural information. The catalytic interest of such solid solution is to provide a continuous variation of M-S bond strength which is considered as the key parameter of the catalytic activity transition metal sulfides. The solid solution is maintained after promotion by Ni either on unsupported or supported state. Des composés Mo0.5W0.5S2 ont été préparés à l'état massique et à l'état dispersé sur alumine. L'absorption X, seule technique permettant d'obtenir cette information, montre que les deux cations Mo et W sont présents au sein de chaque couche [MS2], selon un modèle de solution solide intrafeuillet. L'intérêt de ce système mixte est de pouvoir moduler la force de liaison Métal-Soufre considérée comme le paramètre clé de l'activité catalytique des sulfures de métaux de transition. Cette solution solide est toujours présente après promotion par le Ni des systèmes massiques ou supportés sur alumine.
ISSN:1294-4475
1953-8189
DOI:10.2516/ogst:2005055