Hydrogen purification for fuel cell using CuO/CeO sub(2)-Al sub(2)O sub(3) catalyst

CuO/CeO sub(2), CuO/Al sub(2)O sub(3) and CuO/CeO sub(2)-Al sub(2)O sub(3) catalysts, with CuO loading varying from 1 to 5 wt.%, were prepared by the citrate method and applied to the preferential oxidation of carbon monoxide in a reaction medium containing large amounts of hydrogen (PROX-CO). The c...

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Bibliographic Details
Published in:Journal of power sources 2011-01, Vol.196 (2), p.747-753
Main Authors: Maciel, Cristhiane Guimaraes, Profeti, Luciene Paula Roberto, Assaf, Elisabete Moreira, Assaf, Jose Mansur
Format: Article
Language:English
Subjects:
ALUMINUM OXIDE
Carbon monoxide
CATALYSTS
CERIUM ALLOYS (0 TO 50 CE)
Cerium oxide
COPPER OXIDE
Dispersions
FUEL CELLS
HYDROGEN
Metal particles
PURIFICATION
Reduction
Specific surface
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Summary:CuO/CeO sub(2), CuO/Al sub(2)O sub(3) and CuO/CeO sub(2)-Al sub(2)O sub(3) catalysts, with CuO loading varying from 1 to 5 wt.%, were prepared by the citrate method and applied to the preferential oxidation of carbon monoxide in a reaction medium containing large amounts of hydrogen (PROX-CO). The compounds were characterized ex situ by X-ray diffraction, specific surface area measurements, temperature-programmed reduction and temperature-programmed reduction of oxidized surfaces; XANES-PROX in situ experiments were also carried out to study the copper oxidation state under PROX-CO conditions. These analyses showed that in the reaction medium the Cu super(0) is present as dispersed particles. On the ceria, these metallic particles are smaller and more finely dispersed, resulting in a stronger metal-support interaction than in CuO/Al sub(2)O sub(3) or CuO/CeO sub(2)-Al sub(2)O sub(3) catalysts, providing higher PROX-CO activity and better selectivity in the conversion of CO to CO sub(2) despite the greater BET area presented by samples supported on alumina. It is also shown that the lower CuO content, the higher metal dispersion and consequently the catalytic activity. The redox properties of the ceria support also contributed to catalytic performance.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2010.07.061