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Título: | Role of interface contact in CeO2-TiO2 photocatalytic composite materials |
Autor: | Muñoz-Batista, Mario J. CSIC ORCID; Gómez-Cerezo, María Natividad; Kubacka, Anna CSIC ORCID; Tudela, David; Fernández, M. | Palabras clave: | Ceria Pollutant Degradation Spectro-kinetic study Anatase |
Fecha de publicación: | 2014 | Editor: | American Chemical Society | Citación: | ACS Catalysis 4(1): 63-72 (2014) | Resumen: | The role of interface contact between two oxides, CeO2 and TiO2, for the photocatalytic elimination of toluene is examined in a series of samples with variable quantities of ceria. Samples having ceria contents in the 1 to 10 mol % range improve significantly, exhibiting up to 3.5 times the activity of the bare nano-TiO2 catalyst. To interpret the photocatalytic behavior, this contribution develops a novel spectro-kinetic approach where a joined analysis of the kinetics of the reaction and the fate of charge charriers is merged with the mathematical modeling of the light–catalyst interaction at the photoreactor. This produces a self-consistent approach that simultaneously validates the kinetic model and interprets the activity on rigorous bases. The study is completed with a multitechnique examination of the solids using X-ray diffraction and electron paramagnetic resonance, UV–vis, and X-ray photoelectron spectroscopies as well as high-resolution transmission electron microscopy. The results provide quantitative evidence that the oxide–oxide contact controls the photoactivity through the number of hole-related species available at the surface of the composite materials and that this number is in turn related to the stabilization of reduced Ce species present at the Ce–Ti interface. | Versión del editor: | https://doi.org/10.1021/cs400878b | URI: | http://hdl.handle.net/10261/187221 | DOI: | 10.1021/cs400878b | E-ISSN: | 2155-5435 |
Aparece en las colecciones: | (ICP) Artículos |
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