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Título
Preparation of activated carbon-metal oxide hybrid catalysts: textural characterization
Autor(es)
Materia
Activated carbon
Metal oxides
Hybrid catalysts
Textural characterization
Clasificación UNESCO
2303 Química Inorgánica
3321.02 Productos Químicos derivados del Carbón
Fecha de publicación
2014
Editor
Elsevier
Citación
Barroso-Bogeat, A., Alexandre-Franco, M., Fernández-González, C., Gómez-Serrano, V. (2014). Preparation of activated carbon-metal oxide hybrid catalysts: textural characterization, Fuel Processing Technology, 126 pp 95-103. http://dx.doi.org/10.1016/j.fuproc.2014.04.022
Resumen
[EN] In catalysis processes, activated carbon (AC) and metal oxides (MOs) are used as catalysts and catalyst supports
because of their textural and chemical properties. A combination of AC andMO properties in a single catalyst entails
changes in the catalytic activity and behaviour which would redound to the number of applications. The
present study aims at preparing AC-MO hybrid catalysts by chemical interaction of MO precursors in aqueous
medium with AC and at carrying out the textural characterization of the samples. From a commercial AC and
six MO precursors (i.e. Fe3+, Al3+, Zn2+, SnCl2, TiO2, andWO4 2 −), three series of hybrid catalysts were prepared
by wet impregnation and oven-drying at 120 °C and subsequent heat treatment of the resulting products at 200
or 850 °C in inert atmosphere. The samples were characterized texturally by N2 adsorption at−196 °C, mercury
porosimetry, and density measurements. Therefore, the influence of theMO precursor and heating conditions on
the porous texture is studied. Yield varies more widely for the samples prepared at 120 °C and 850 °C than at
200 °C. The mass increase after oven-drying at 120 °C and the mass decrease after heating at 850 °C are much
greater for the Sn catalysts. Because of the support ofMO precursors on AC, in general, macro-, meso-, and microporosity
significantly decrease. The effects on the texture of AC are by far more important for the Sn catalyst and
also, though less, for the Fe catalyst. However, they are weaker for theW and Ti catalysts. In general, the heat
treatment at 200 °C only causes small changes in the porous texture of the samples. By heating at 850 °C the
pore size distribution becomes more uniform in the three porosity regions. Microporosity develops chiefly for
the Sn catalyst, whereas mesoporosity does mainly for the Sn and Fe catalysts. The textural modifications have
been associated with mass, composition, and structural modifications.
URI
ISSN
0378-3820
DOI
10.1016/j.fuproc.2014.04.022
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