Open AccessQEXAFS study of the sulfidation of NiMo/Al 2 O 3 hydrotreating catalysts
Author(s) -
Cattaneo Riccardo,
Shido Takafumi,
Prins Roel
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500020343
Subject(s) - sulfidation , hydrodesulfurization , catalysis , materials science , chemistry , chemical engineering , organic chemistry , engineering
Quick‐scanning extended X‐ray absorption fine structure (QEXAFS) spectroscopy was employed to investigate in situ the sulfidation of Mo and Ni in γ‐Al 2 O 3 ‐supported hydrotreating catalysts modified with chelating ligands. Mo K ‐edge QEXAFS enabled the detection of an intermediate product in the sulfidation of Mo. The parameters obtained from the fits of the QEXAFS spectra showed that this product consists of compounds similar to Mo 2 S or Mo 3 S. QEXAFS also demonstrated that the sulfidation of Ni is strongly influenced by the presence of chelating ligands. Classical EXAFS spectra of the sulfided catalysts showed that Ni forms small sulfided clusters, the size of which is influenced by the presence or absence of the chelating agents.