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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Published inCatalysis letters Vol. 73; no. 2-4; pp. 95 - 98
Main Authors GEANTET, Christophe, SOLDO, Yvonne, GLASSON, Cécile, MATSUBAYASHI, Nobuyuki, LACROIX, Michel, PROUX, Olivier, ULRICH, Olivier, HAZEMANN, Jean-Louis
Format Journal Article
LanguageEnglish
Published Dordrecht Springer 01.05.2001
Springer Nature B.V
Springer Verlag
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
Mixed catalyst
Heterogeneous catalysis
XANES spectrometry
Hydrotreating
In situ
Transition metal
Alumina
Cobalt
Molybdenum
Supported catalyst
EXAFS spectrometry
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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