Mostrar el registro sencillo del ítem
dc.contributor.author
Fernández García, Susana
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.contributor.author
Collins, Sebastián Enrique
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.contributor.author
Tinoco, Miguel
dc.contributor.author
Hungría, Ana B.
dc.contributor.author
Calvino, José J.
dc.contributor.author
Cauqui, Miguel A.
dc.contributor.author
Chen, Xiaowei
dc.date.available
2020-05-19T22:52:44Z
dc.date.issued
2019-01
dc.identifier.citation
Fernández García, Susana; Collins, Sebastián Enrique; Tinoco, Miguel; Hungría, Ana B.; Calvino, José J.; et al.; Influence of {111} nanofaceting on the dynamics of CO adsorption and oxidation over Au supported on CeO 2 nanocubes: An operando DRIFT insight; Elsevier Science; Catalysis Today; 1-2019
dc.identifier.issn
0920-5861
dc.identifier.uri
http://hdl.handle.net/11336/105527
dc.description.abstract
CO adsorption and further reaction with O 2 on two Au/CeO 2 model systems have been investigated by operando diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) in order to unveil the active sites for CO oxidation. One of the ceria supports was constituted by crystallites depicting a nanocube shape bounded mostly by {100} planes, whilst the second one was consisted of nanocubes whose {110} surfaces were reconstructed into {111}-nanofacets with a zig-zag shape. The deconvolution of the CO adsorption bands and a detailed analysis of the time-evolution of these bands were also carried out. These studies evidenced a fast adsorption of CO over Au° and then Au δ- -CO bands appeared during exposure to CO, in parallel with the appearance of Ce 3+ features. Such changes suggest that CO adsorption process starts on Au sites on the low coordinated sites of the surface of the Au nanoparticles and their transfer to the interface sites. By comparing the nanostructure of the two catalysts, the Au δ- -CO species could be fruitfully related to CO adsorption on sites located at the Au||CeO 2 perimeter. The sample containing gold nanoparticles dispersed over the {111}-nanofaceted CeO 2 nanocubes, which retained a higher amount of gold nanoparticles, depicts higher contribution of Au δ− −CO bands than the other Au catalyst in the DRIFT spectra. The dynamic DRIFT study clearly revealed that the CO species adsorbed on Au δ- sites were the most reactive ones in both gold supported systems for CO oxidation. This explains much higher TOF values observed on the catalyst prepared on the surface reconstructed support. A detailed analysis on the reactivity was performed by modulation excitation spectroscopy (MES). The presence of peroxide surface species (O 2 2- ) in nanofaceted {111} could lead to higher catalytic activity than that of gold on the non-reconstructed catalyst.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
C-MES
dc.subject
CERIA
dc.subject
CO OXIDATION
dc.subject
DRIFT
dc.subject
GOLD
dc.subject
NANOCUBES
dc.subject.classification
Otras Ciencias Químicas
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.subject.classification
Ciencias Químicas
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.title
Influence of {111} nanofaceting on the dynamics of CO adsorption and oxidation over Au supported on CeO 2 nanocubes: An operando DRIFT insight
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-05-19T19:49:33Z
dc.journal.pais
Países Bajos
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Fernández García, Susana. Universidad de Cádiz; España
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: Tinoco, Miguel. Universidad de Cádiz; España
dc.description.fil
Fil: Hungría, Ana B.. Universidad de Cádiz; España
dc.description.fil
Fil: Calvino, José J.. Universidad de Cádiz; España
dc.description.fil
Fil: Cauqui, Miguel A.. Universidad de Cádiz; España
dc.description.fil
Fil: Chen, Xiaowei. Universidad de Cádiz; España
dc.journal.title
Catalysis Today
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.cattod.2019.01.078
Archivos asociados