Methane oxidation over SOFC anodes with nanocrystalline ceria-based phases

The electrocatalytic performance of cermet anodes comprising Pt and nanocrystalline ceria-based components, Pt-modified Ce 0.45Zr 0.45La 0.10O 2− δ  (CZLO) and Ce 0.8Gd 0.2O 2− δ (CGO), was evaluated for the oxidation of dry CH 4 in a SOFC-type reactor with zirconia-based electrolyte. At temperature...

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Bibliographic Details
Published in:Solid state ionics 2006-10, Vol.177 (19), p.2179-2183
Main Authors: Kharton, V.V., Yaremchenko, A.A., Valente, A.A., Frolova, E.V., Ivanovskaya, M.I., Frade, J.R., Marques, F.M.B., Rocha, J.
Format: Article
Language:English
Subjects:
Catalyst
Methane oxidation
Nanocrystalline ceria
SOFC anode
Syngas generation
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Summary:The electrocatalytic performance of cermet anodes comprising Pt and nanocrystalline ceria-based components, Pt-modified Ce 0.45Zr 0.45La 0.10O 2− δ  (CZLO) and Ce 0.8Gd 0.2O 2− δ (CGO), was evaluated for the oxidation of dry CH 4 in a SOFC-type reactor with zirconia-based electrolyte. At temperatures above 1100 K, CZLO-containing cermet exhibits a high activity towards the partial oxidation of methane, probably promoted by instability of the cubic fluorite lattice. For the stoichiometric O 2:CH 4 ratio equal to 0.5, the CO yield over CZLO/Pt anode is 73% with 54% conversion at 1173 K. Further increase in the CO selectivity and CH 4 conversion, up to 84% and 87% respectively, can be achieved by incorporating Pt-modified CZLO catalyst at the reactor outlet.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2006.04.037