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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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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)