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Surface oxygen vacancies in gold based catalysts for CO oxidation

Opened Access Surface oxygen vacancies in gold based catalysts for CO oxidation

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Autor: Romero Sarria, Francisca
Plata Ramos, José Javier
Laguna Espitia, Oscar Hernando
Márquez Cruz, Antonio Marcial
Centeno Gallego, Miguel Ángel
Fernández Sanz, Javier
Odriozola Gordón, José Antonio
Departamento: Universidad de Sevilla. Departamento de Química Inorgánica
Universidad de Sevilla. Departamento de Química Física
Fecha: 2014
Publicado en: RSC Advances: An International Journal to Further the Chemical Sciences, 4, 13145-13152.
Tipo de documento: Artículo
Resumen: Experimental catalytic activity measurements, Diffuse Reflectance Infrared Fourier Spectroscopy, and Density Functional Theory calculations are used to investigate the role and dynamics of surface oxygen vacancies in the CO oxidation with O2 catalyzed by Au nanoparticles supported on a Y-doped TiO2 catalyst. Catalytic activity measurements show that the CO conversion is improved in a second cycle of reaction if the reactive flow is composed by CO and O2 (and inert) while if water is present in the flow, the catalyst shows a similar behaviour in two successive cycles. DRIFTS-MS studies indicate the occurrence of two simultaneous phenomena during the first cycle in dry conditions: the surface is dehydroxylated and a band at 2194 cm-1 increases (proportionally to the number of surface oxygen vacancies). Theoretical calculations were conducted in order to explain these observations. On one hand, the calculations show that there is a competition between gold nanoparticles and OH to occupy...
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Cita: Romero Sarria, F., Plata Ramos, J.J., Laguna Espitia, O.H., Márquez Cruz, A.M., Centeno Gallego, M.Á., Fernández Sanz, J. y Odriozola Gordón, J.A. (2014). Surface oxygen vacancies in gold based catalysts for CO oxidation. RSC Advances: An International Journal to Further the Chemical Sciences, 4, 13145-13152.
Tamaño: 450.4Kb
Formato: PDF

URI: http://hdl.handle.net/11441/56065

DOI: 10.1039/C3RA46662K

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