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Title: In situ FT-IR study of the adsorption and photocatalytic oxidation of ethanol over sulfated and metallized TiO2
Authors: Murcia Mesa, Julie Joseane
Hidalgo, M. Carmen
Navío, Jose Antonio
Araña, J. 
Doña-Rodríguez, J. M. 
UNESCO Clasification: 221001 Catálisis
Keywords: Sulfated TiO2 photocatalysts
Ethanol photo-oxidation
Issue Date: 2013
Journal: Applied Catalysis B: Environmental 
Abstract: TiO2 Degussa P25, TiO2 prepared by sol–gel submitted to sulfation pre-treatment and some metallized catalysts obtained by photodeposition of Au or Pt over the sulfated TiO2, were evaluated in the reaction of ethanol photo-oxidation. FT-IR spectroscopy was used to investigate the surface features of the photocatalysts, identifying adsorbed species and following the evolution of intermediate products in the ethanol photo-oxidation reaction. Nature of surface acidity in terms of Brönsted and Lewis centers was also studied. Results showed that sulfation pre-treatment and metallization were important factors influencing the selectivity. Acetaldehyde was the main oxidation product on sulfated TiO2; in the case of P25 also acetates production was observed. The photodeposition of metals had a detrimental effect on the selectivity to acetaldehyde; on metallized catalysts the formation of stable secondary intermediates was detected. Based on these findings, a reaction pathway for the ethanol photo-oxidation over the different photocatalysts, via acetaldehyde or via acetate formation is proposed.
ISSN: 0926-3373
DOI: 10.1016/j.apcatb.2013.05.022
Source: Applied Catalysis B: Environmental [ISSN 0926-3373], v. 142-143, p. 205-213
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