Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 35, Issue 20, Pages 11216-11228Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2010.07.026
Keywords
Anode; Carbon deposition; Ethanol; Solid oxide fuel cell (SOFC); Iron-nickel catalyst; Reforming
Categories
Funding
- Brazilian Ministry of Science and Technology (MCT)
- Rede PaCOS [01.06.0901.00]
- Rede Norte/Nordeste de Catalise (RECAT) [22.02.0289.00]
- FINEP/CT-PETRO
- FAPESB
- CNPq
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Electrocatalysts based on Fe-Ni alloys were prepared by means of modified Pechini and physical mixture methods and using on a composite of Yttria Stabilized Zirconia (YSZ) and Gadolinia-Doped Ceria (GDC) as support. The former method was based on the formation a polymeric precursor that was subsequently calcined; the later method was based on the mixture of NiO and the support. The resulting composites had 35 wt.% metal load and 65 wt.% support (70 wt.% YSZ and 30 wt.% GDC mixture) (cermets). The samples were then characterized by Temperature-Programmed Reduction (TPR) and X-Ray Diffraction (XRD) and evaluated in the ethanol steam reforming at 650 degrees C for 6 h in the temperature range of 300-900 degrees C. The XRD results showed that the bimetallic sample calcined at 800 degrees C formed a mixed oxide (NiFe(2)O(4)) with a spinel structure, which, after reduction in hydrogen, formed Ni-Fe alloys. The presence of Ni was observed to decrease the final reduction temperature of the NiFe(2)O(4) species. The addition of iron to the nickel anchored to YSZ-GDC increased the hydrogen production and inhibited carbon deposition. The resulting bimetallic 30Fe5Ni sample reached an ethanol conversion of about 95% and a hydrogen yield up to 48% at 750 degrees C. In general, ethanol conversion and hydrogen production were independent of the metal content in the electrocatalyst. However, the substitution of nickel for iron significantly reduced carbon deposition on the electrocatalyst: 74, 31, and 9 wt.% in the 35Ni, 20Fe15Ni, and 30Fe5Ni samples, respectively. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
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