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Titel
Methanation of carbon dioxide over ceria-praseodymia promoted Ni-alumina catalysts. Influence of metal loading, promoter composition and alumina modifier
Autor(es)
Schlagwort
CO2 methanation
Ni-alumina catalysts
Ceria-praseodymia promoter
Modified alumina support
Clasificación UNESCO
2303 Química Inorgánica
2303.18 Metales
Fecha de publicación
2018
Verlag
Elsevier
Citación
Lechkar, A., Barroso-Bogeat, A., Blanco, G., Pintado, J., Soussi el Begrani, M. (2018). Methanation of carbon dioxide over ceria-praseodymia promoted Nialumina catalysts. Influence of metal loading, promoter composition and alumina modifier, Fuel, 234 pp 1401-1413. https://doi.org/10.1016/j.fuel.2018.07.157
Resumen
[EN] Two series of ceria-praseodymia promoted Ni-alumina catalysts were prepared from two different commercial modified alumina supports (3.5 wt% SiO2-Al2O3 and 4.0 wt% La2O3-Al2O3) by the incipient wetness impregnation
method in two successive steps. The resulting materials were characterized in terms of their physicochemical
properties by means of N2 physical adsorption at −196 °C, powder X-ray diffraction (XRD) and temperature
programmed reduction with H2 (H2-TPR). Furthermore, the as-prepared catalysts were tested for the
CO2 methanation reaction in a fixed-bed reactor at atmospheric pressure, gas hourly space velocity (GHSV) of
72,000 cm3·(h·gcat)−1 and CO2/H2 molar ratio of 1/4 over the temperature range from 25 up to 850 °C. The
influence of the nominal Ni loading (3, 5 and 10 wt%), molar composition of the Ce/Pr mixed oxide promoter
(80/20 and 60/40), and alumina modifier (silica and lanthana) on the catalytic performance was carefully
analyzed. Among these three composition parameters, the alumina dopant and especially the Ni content appear
to have by far a much more pronounced effect on both the CO2 conversion and CH4 selectivity as compared to
the Ce/Pr mixed oxide composition. Specifically, from the catalytic tests the sample containing a 10 wt% Ni
loading, a Ce/Pr mixed oxide promoter of 80/20 molar composition, and silica as modifier provides the highest
catalytic activity in terms of CO2 conversion and CH4 selectivity. Such behaviour has been ascribed to a complex
interplay between several factors, mainly the larger fraction of catalytically active β-type NiO species
URI
ISSN
0016-2361
DOI
10.1016/j.fuel.2018.07.157
Versión del editor
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