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Titre
Preparation and Microstructural Characterization of Activated Carbon-Metal Oxide Hybrid Catalysts: New Insights into Reaction Paths
Autor(es)
Sujet
Activated carbon
Metal oxides
Hybrid catalysts
Preparation
Microstructural characterization
X-ray diffraction
Clasificación UNESCO
2303 Química Inorgánica
2306.15 Mecanismos de Reacción
Fecha de publicación
2015
Éditeur
Elsevier
Citación
Barroso-Bogeat, A., Alexandre-Franco, M., Fernández-González, C., Gómez-Serrano, V. (2015). Preparation and Microstructural Characterization of Activated Carbon-Metal Oxide Hybrid Catalysts: New Insights into Reaction Paths, Journal of Materials Science & Technology, 31 pp 806-814. http://dx.doi.org/10.1016/j.jmst.2015.06.004
Resumen
[EN] In catalysis processes, activated carbon (AC) and metal oxides (MOs) are widely used either as catalysts or
as catalyst supports because of their unique properties. A combination of AC and MO nanoparticles in a
single hybrid material usually entails both chemical and microstructural changes, which may largely
influence the potential catalytic suitability and performance of the resulting product. Here, the preparation
of a wide series of AC MO hybrid catalysts is studied. Three series of such catalysts are prepared
by support first of MO (Al2O3, Fe2O3, SnO2, TiO2, WO3, and ZnO) precursors on a granular AC by wet
impregnation and oven-drying at 120 ºC, and by subsequent heat treatment at 200 or 850 ºC in inert
atmosphere. Both the chemical composition and microstructure are mainly investigated by powder X-ray
diffraction. Yield and ash content are often strongly dependent on the MO precursor and heat treatment
temperature, in particular for the Sn catalysts. With the temperature rise, trends are towards the
transformation of metal hydroxides into metal oxides, crystallinity improvement, and occurrence of
drastic composition changes, ultimately leading to the formation of metals in elemental state and even
metal carbides. Reaction paths during the preparation are explored for various hybrid catalysts and new
insights into them are provided.
URI
ISSN
1005-0302
DOI
10.1016/j.jmst.2015.06.004
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