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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 Pt-TiO2 Au-TiO2Ethanol Ethanol photo-oxidation FT-IR |
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. | URI: | http://hdl.handle.net/10553/49936 | 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 |
Appears in Collections: | Artículos |
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