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dc.contributor.author
Collins, Sebastián Enrique
dc.contributor.author
Cíes, José M.
dc.contributor.author
del Río, Eloy
dc.contributor.author
Lopez Haro, Miguel
dc.contributor.author
Trasobares, Susana
dc.contributor.author
Calvino, José J.
dc.contributor.author
Pintado, José M.
dc.contributor.author
Bernal, Serafín
dc.date.available
2017-07-18T15:46:55Z
dc.date.issued
2007-12
dc.identifier.citation
Collins, Sebastián Enrique; Cíes, José M.; del Río, Eloy; Lopez Haro, Miguel; Trasobares, Susana; et al.; Hydrogen interaction with a ceria-zirconia supported gold catalyst. Influence of CO co-adsorption and pre-treatment conditions; American Chemical Society; Journal of Physical Chemistry C; 111; 39; 12-2007; 14371-14379
dc.identifier.issn
1932-7447
dc.identifier.uri
http://hdl.handle.net/11336/20793
dc.description.abstract
This work reports on the hydrogen interaction with a 3 wt % Au/Ce0.62Zr0.38O2 (Au/CZ) catalyst prepared by deposition−precipitation. As deduced from X-ray powder diffraction, electron microscopy (scanning transmission electron microscopy−high-angle angular dark field and high-resolution electron microscopy), and CO volumetric/Fourier transform IR (FTIR) adsorption studies, the investigated catalyst shows a good metal dispersion. By combining FTIR spectroscopy and volumetric chemisorption studies, it is shown that upon treating the Au/CZ catalyst with 40 Torr of H2 at room temperature a fast and very intense spillover effect occurs. As determined from the recorded isotherm, very high values of the apparent H/Au ratio (>8.0) and of the atomic hydrogen surface density (>11.0 H/nm2) are reached. In parallel with this observation, the onset of a characteristic IR band at 2133 cm-1 shows the occurrence of significant support reduction with inherent appearance of Ce3+ species. Moreover, the simultaneous growth of the IR band at 1630 cm-1 due to molecular water strongly suggests that even at room temperature oxygen vacancies are also formed. Additional FTIR spectroscopy studies have shown that the hydrogen spillover is strongly inhibited by either co-adsorption of CO or a reducing pretreatment with flowing 5% H2/Ar at 673 K. These deactivation effects, however, may be reverted by very mild regeneration treatments at room temperature.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Chemical Society
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject.classification
Ingeniería Química
dc.subject.classification
Ingeniería Química
dc.subject.classification
INGENIERÍAS Y TECNOLOGÍAS
dc.title
Hydrogen interaction with a ceria-zirconia supported gold catalyst. Influence of CO co-adsorption and pre-treatment conditions
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-07-13T18:46:36Z
dc.journal.volume
111
dc.journal.number
39
dc.journal.pagination
14371-14379
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Collins, Sebastián Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
dc.description.fil
Fil: Cíes, José M.. Universidad de Cádiz; España
dc.description.fil
Fil: del Río, Eloy. Universidad de Cádiz; España
dc.description.fil
Fil: Lopez Haro, Miguel. Universidad de Cádiz; España
dc.description.fil
Fil: Trasobares, Susana. Universidad de Cádiz; España
dc.description.fil
Fil: Calvino, José J.. Universidad de Cádiz; España
dc.description.fil
Fil: Pintado, José M.. Universidad de Cádiz; España
dc.description.fil
Fil: Bernal, Serafín. Universidad de Cádiz; España
dc.journal.title
Journal of Physical Chemistry C
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1021/jp071968l
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://pubs.acs.org/doi/abs/10.1021/jp071968l


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