Cooperative role of cobalt and gallium under the ethanol steam reforming on Co/CeGaOx |
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Affiliation: | 1. Instituto de Desarrollo Tecnológico para la Industria Química, UNL-CONICET, 3000, Santa Fe, Argentina;2. Facultad de Ingeniería y Ciencias Hídricas, Universidad Nacional del Litoral, Ciudad Universitaria, Ruta Nacional N° 168 - Km 472,4, 3000, Santa Fe, Argentina;3. Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Universidad de Cádiz, Campus Universitario de Puerto Real, 11510, Puerto Real, Cádiz, Spain;4. Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, 3000, Santa Fe, Argentina |
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Abstract: | The performance of gallium promoted cobalt-ceria catalysts for ethanol steam reforming (ESR) was studied using H2O/C2H5OH = 6/1 mol/mol at 500 °C. The catalysts were synthetized via cerium-gallium co-precipitation and wetness impregnation of cobalt. A detailed characterization by N2-physisorption, XRD, H2-TPR and TEM allowed the normalization of contact time and rationalization of the role of each catalysts component for ESR. The gallium promoted catalyst, Co/Ce90Ga10Ox, was more efficient for the ethanol conversion to H2 and CO2, and the production of oxygenated by-products (such as, acetaldehyde and acetone) than Co/CeO2. The catalytic performance is explained assuming that: (i) bare ceria is able to dehydrogenate ethanol to ethylene; (ii) Ce–O–Ga interface catalyzes ethanol reforming; (iii) both Ce–O–Co and Ce–O–Ga interfaces takes part in acetone production; and (iv) cobalt sites further allow C–C scission. It is suggested that a cooperative role between Co and Ce–O–Ga sites enhance the H2 and CO2 yields under ESR conditions. |
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Keywords: | Bioethanol Hydrogen production Ceria Stability Green hydrogen Cobalt-gallium cooperation effect |
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