Gas-phase photocatalytic oxidation of dichlorobutenes
| Autor: | Johannes A. C. Barth, Christopher Hardacre, Noel A. Hamill, Joseph Cunningham, Robert M. Kalin |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
chemistry.chemical_classification
Titanium Reaction mechanism Double bond Photochemistry Inorganic chemistry General Chemistry Waste Disposal Fluid Catalysis chemistry.chemical_compound Oxidants Photochemical Ozone chemistry Semiconductors Photocatalysis Hydrocarbons Chlorinated Environmental Chemistry Hydroxyl radical Aldol condensation Gases Selectivity Oxidation-Reduction Bond cleavage |
| Zdroj: | Environmental sciencetechnology. 35(13) |
| ISSN: | 0013-936X |
| Popis: | 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 chloracetaldehyde, which is the predominant intermediate observed. The variation in rate and selectivity of the oxidation reactions with O2 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. |
| Databáze: | OpenAIRE |
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