Gas-Phase Photocatalytic Oxidation of Dichlorobutenes
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...
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| Veröffentlicht in: | Environmental science & technology 2001-07, Vol.35 (13), p.2823-2827 |
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| creator | Hamill, Noel A Hardacre, Christopher Barth, Johannes A. C Kalin, Robert M Cunningham, Joseph F |
| description | 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 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. |
| doi_str_mv | 10.1021/es001939n |
| format | Article |
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C</creatorcontrib><creatorcontrib>Kalin, Robert M</creatorcontrib><creatorcontrib>Cunningham, Joseph F</creatorcontrib><title>Gas-Phase Photocatalytic Oxidation of Dichlorobutenes</title><title>Environmental science & technology</title><addtitle>Environ. Sci. Technol</addtitle><description>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 O2 concentration is reported and a mechanism is proposed. 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| subjects | Applied sciences Atmospheric pollution Catalysis Catalysts Chemistry Exact sciences and technology Gases General and physical chemistry General processes of purification and dust removal Hydrocarbons, Chlorinated - chemistry Oxidants, Photochemical - chemistry Oxidation Oxidation-Reduction Ozone - chemistry Photocatalysis Photochemistry Physical chemistry of induced reactions (with radiations, particles and ultrasonics) Pollution Prevention and purification methods Scientific imaging Semiconductors Titanium - chemistry Waste disposal Waste Disposal, Fluid - methods Water treatment |
| title | Gas-Phase Photocatalytic Oxidation of Dichlorobutenes |
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