In situ QEXAFS investigation at Co K-edge of the sulfidation of a CoMo/Al2O3 hydrotreating catalyst

In situ sulfidation of a commercial alumina-supported CoMo hydrotreating catalyst (3 wt% Co, 12.3 wt% Mo) has been studied by QEXAFS at Co K-edge. Sulfidation was performed by heating progressively the oxide precursor from room temperature (RT) up to 673 K in a H2/10% H2S flow (ramp 4 K/min). XAFS s...

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Bibliographic Details
Published in:Catalysis letters 2001-05, Vol.73 (2-4), p.95-98
Main Authors: GEANTET, Christophe, SOLDO, Yvonne, GLASSON, Cécile, MATSUBAYASHI, Nobuyuki, LACROIX, Michel, PROUX, Olivier, ULRICH, Olivier, HAZEMANN, Jean-Louis
Format: Article
Language:English
Subjects:
Aluminum oxide
Catalysis
Catalysts
Catalysts: preparations and properties
Chemical Sciences
Chemistry
Exact sciences and technology
General and physical chemistry
Hydrogen sulfide
Sulfidation
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:In situ sulfidation of a commercial alumina-supported CoMo hydrotreating catalyst (3 wt% Co, 12.3 wt% Mo) has been studied by QEXAFS at Co K-edge. Sulfidation was performed by heating progressively the oxide precursor from room temperature (RT) up to 673 K in a H2/10% H2S flow (ramp 4 K/min). XAFS spectra were recorded each 10 K with an acquisition time of only 30 s. The obtained XANES and EXAFS data were compared with those of a Co/Al2O3 (2.36 wt% Co) used as reference sample. It is evidenced that sulfidation of Co atoms in a CoMo/Al2O3 catalyst starts at room temperature while the sulfidation of a Co/Al2O3 catalyst begins at 473 K.
ISSN:1011-372X
1572-879X
DOI:10.1023/A:1016645930518