IngentaConnect Efficient Production of Hydrogen over Supported Cobalt Catalysts ...

Authors: Llorca J.; Homs N.; Sales J.; de la Piscina P.R.

Source: Journal of Catalysis, Volume 209, Number 2, July 2002 , pp. 306-317(12)

Abstract:

The reaction between ethanol and water was studied in the temperature range 573–723 K at atmospheric pressure over supported cobalt catalysts. Cobalt-loaded catalysts (1%) were prepared by impregnation of Co₂(CO)₈ on MgO, gamma -Al₂O₃, SiO₂, TiO₂, V₂O₅, ZnO, La₂O₃, CeO₂, and Sm₂O₃. Ethanol steam reforming occurred to a large degree over ZnO-, La₂O₃-, Sm₂O₃-, and CeO₂-supported catalysts; CO-free hydrogen was produced. Samples were characterized after catalytic tests by high-resolution transmission electron microscopy, electron diffraction, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and temperature-programmed hydrogen reaction. Depending on the support, different cobalt-based phases were identified: metallic cobalt particles, Co₂C, CoO, and La₂CoO₄. The extent and nature of carbon deposition depended on the sample and on the reaction temperature. ZnO-supported samples showed the best catalytic performances. Under 100% ethanol conversion, selectivity up to 73.8% to H₂ and 24.2% to CO₂ was obtained. © 2002 Elsevier Science (USA).

Language: English

Document Type: Research article

Affiliations: Departament de Química Inorgànica, Facultat de Química, Universitat de Barcelona, C/Martí i Franquès 1-11, Barcelona, 08028, Spain:

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Efficient Production of Hydrogen over Supported Cobalt Catalysts from Ethanol Steam Reforming