Gas-Phase Photocatalytic Oxidation of Dichlorobutenes

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• 作者：Noel A. Hamill ; Christopher Hardacre ; Johannes A. C. Barth ; Robert M. Kalin ; and Joseph F. Cunningham
• 刊名：Environmental Science & Technology
• 出版年：2001
• 出版时间：July 1, 2001
• 年：2001
• 卷：35
• 期：13
• 页码：2823 - 2827
• 全文大小：76K
• 年卷期：v.35,no.13(July 1, 2001)
• ISSN：1520-5851

文摘

Gas-phase photocatalysis of 1,4-dichlorobut-2-enes and3,4-dichlorobut-1-ene (DCB) has been studied using TiO₂ and3%WO₃/TiO₂ supported on SiO₂. DCB was found tooxidize efficiently over these catalysts; however, only lowrates of CO₂ formation were observed. With thesechlorinated hydrocarbons, the catalysts were found todeactivate over time, probably via the formation of aldolcondensation products of chloroacetaldehyde, which is thepredominant intermediate observed. The variation in rateand selectivity of the oxidation reactions with O₂ concentrationis reported and a mechanism is proposed. Using isotoperatio mass spectrometry, the initial step for the DCB removalhas been shown not to be a carbon bond cleavage butis likely to be hydroxyl radical addition to the carbon-carbon double bond.