Oxidation of styrene oxide via chemical and photochemical methods using TiO2-CeO2-V2O5 catalysts

Ma Elena Manríquez, Martín Trejo Valdez, Andrea Sánchez Pliego, Laura V. Castro, Emma Ortiz-Islas

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This work reports the preparation of the TiO2-CeO2 (TiCe) catalytic support of V2O5 catalysts, which was tested in the oxidation process of styrene oxide via chemical and photochemical methods. The TiCe-V2O5 catalytic support was prepared by the co-precipitated method from the individual metal oxides, varying the amount of vanadium oxide by 3, 6, and 10 % mol with respect to the support. The obtained catalysts were characterized by different spectroscopies, as well as by the N2 adsorption-desorption technique. The catalytic reaction test was carried out in the liquid phase during 120 min with/without ultraviolet light irradiation at 50 °C. There was no V2O5 effect on the surface area, pore volume, and pore diameter since all catalysts had similar textural values. In all samples the structures identified by X-ray diffraction were the Anatase phase and CeO2 in the cubic phase. XPS results revealed the formation of surface carbonate species, which were also identified by infrared spectroscopy. The conversion rate was better when employing ultraviolet light, and the rate increased as the V2O5 amount rose. The main reaction products were 2-phenylethanol and 1-phenylethanol. However, a low amount of benzaldehyde was detected. The selectivity to the desirable product (2-phenylethanol) increased when the reaction was irradiated with UV light and the catalyst contained a higher amount of vanadium. It was observed that the effect of UV radiation on the electric mobility produces an acceleration of the reaction to 2-phenylethanol, avoiding the 1-phenylethanol formation. The bandgap value decreased as the vanadium oxide amount increased, boosting the electric mobility.

Original languageEnglish
Article number112505
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume395
DOIs
StatePublished - 15 May 2020
Externally publishedYes

Keywords

  • Catalysts
  • Chemical
  • Oxidation
  • Photochemical
  • Styrene oxide

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