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Joint use of electron probe microanalysis and of electron microscopy for the study of the oxidic precursory state of Co-Mo supported on SiO/sub 2/ and gamma -Al/sub 2/O/sub 3/ hydrotreating catalysts

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Delannay, Francis [UCL] Gajardo, P. Grange, Paul [UCL]

Analytical electron microscopy is used to describe the oxidic precursory state of Co-Mo supported on SiO/sub 2/ and gamma -Al /sub 2/O/sub 3/ catalysts. A method is developed to evaluate by EPMA the concentration of the phases dispersed on the surface of the carrier at a scale lower than the resolution limit of the microscopic observation. The catalysts supported on SiO/sub 2/ exhibit a large mutual affinity of cobalt and molybdenum to form crystallized CoMoO/sub 4/ aggregates. The dispersion of cobalt on gamma -Al/sub 2/O/sub 3/ appears highly favoured by the previous dispersion of molybdenum. Some factors working against the dispersion of the active phases are pointed.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 1978
Journal information "Journal de Microscopie et de Spectroscopie Electroniques" - Vol. 3, no. 5, p. 411-426 (1978)
Peer reviewed yes
issn 0395-9279
Publication status Publié
Affiliation UCL - Autre
Links
Bibliographic reference Delannay, Francis ; Gajardo, P. ; Grange, Paul. Joint use of electron probe microanalysis and of electron microscopy for the study of the oxidic precursory state of Co-Mo supported on SiO/sub 2/ and gamma -Al/sub 2/O/sub 3/ hydrotreating catalysts. In: Journal de Microscopie et de Spectroscopie Electroniques, Vol. 3, no. 5, p. 411-426 (1978)
Permanent URL http://hdl.handle.net/2078.1/66571