Direct gas-phase photocatalytic epoxidation of propylene with molecular oxygen by photocatalysts

Van Huy Nguyen, Hsiang Yu Chan, Jeffrey C.S. Wu*, Hsun-Ling Bai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The photocatalytic epoxidation of propylene by molecular oxygen is one of the best methods to produce propylene oxide (PO) from the environmental viewpoints. The key is using photo-energy to achieve high PO selectivity and yield at mild conditions. A series of photocatalysts including SiO 2, TiO 2, V-Ti/MCM-41, V 2O 5/SiO 2, Au/TiO 2 and TS-1, were used to evaluate their performance in the photo-epoxidation. The photocatalytic epoxidation of propylene was carried out in the gas mixture of C 3H 6:O 2:N 2=1:1:18 at atmospheric pressure. In addition to PO, other products, such as propionaldehyde, acetone, acetaldehyde, ethanol and methanol, were detected. The results indicated that the most favorable photocatalysts for photocatalytic epoxidation were silicates supported group. The highest PO formation rate of 114μmolgcat -1h -1 with selectivity of 47% was obtained over V-Ti/MCM-41 on stream after 4h at 50°C and atmospheric pressure under UVA irradiation of 0.2mW/cm 2. In addition, the selectivity of products was very stable on stream. A possible reaction mechanism was proposed based on the knowledge of species presented during the photocatalytic reaction.

Original languageEnglish
Pages (from-to)285-294
Number of pages10
JournalChemical Engineering Journal
Volume179
DOIs
StatePublished - 1 Jan 2012

Keywords

  • Epoxidation
  • MCM-41
  • Molecular oxygen
  • Photocatalysis
  • Propylene oxide
  • TiO

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