Gas-phase photocatalytic oxidation of dichlorobutenes

N.A. Hamill, C. Hardacre, J.A.C. Barth, R.M. Kalin, J.F. Cunningham

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Abstract

Gas-phase photocatalysis of 1,4-dichlorobut-2-enes and 3,4-dichlorobut-1-ene (DCB) has been studied using TiO2 and 3%WO3/TiO2 supported on SiO2. DCB was found to oxidize efficiently over these catalysts; however, only low rates of CO2 formation were observed. With these chlorinated hydrocarbons, the catalysts were found to deactivate over time, probably via the formation of aldol condensation products of chloroacetaldehyde, which is the predominant intermediate observed. The variation in rate and selectivity of the oxidation reactions with O-2 concentration is reported and a mechanism is proposed. Using isotope ratio mass spectrometry, the initial step for the DCB removal has been shown not to be a carbon bond cleavage but is likely to be hydroxyl radical addition to the carbon-carbon double bond.
Original languageEnglish
Pages (from-to)2823-2827
Number of pages5
JournalEnvironmental Science and Technology
Volume35
Issue number13
DOIs
Publication statusPublished - 1 Jul 2001

Keywords

  • Gas-phase photocatalysis
  • oxidation
  • isotope ratio mass spectrometry

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    Hamill, N. A., Hardacre, C., Barth, J. A. C., Kalin, R. M., & Cunningham, J. F. (2001). Gas-phase photocatalytic oxidation of dichlorobutenes. Environmental Science and Technology , 35(13), 2823-2827. https://doi.org/10.1021/es001939n