溴代烷烃光氧化的研究

Study on the Photooxidation of Brominated Alkanes

本文模拟大气条件，研究了ＣＨ３Ｂｒ＋Ｈ２Ｏ２＋Ｏ２，ＣＨ３Ｂｒ＋Ｏ２，ＣＨＢｒ３＋Ｈ２Ｏ２＋Ｏ２，和ＣＨＢｒ３＋Ｏ２４个体系的光化学反应。这些体系在２５３．７ｎｍ的紫外光照射下Ｈ２Ｏ２产生了ＯＨ自由基，ＯＨ自由基与ＣＨ３Ｂｒ和ＣＨＢｒ３反应，在２０ｍ的长光程气体池中用ＦＴＩＲ测量这些反应产物，发现在ＣＨ３Ｂｒ＋Ｈ２Ｏ２＋Ｏ２和ＣＨ３Ｂｒ＋Ｏ２体系其光化学反应产物为ＣＯ，ＣＯ２，ＣＨ２Ｏ和Ｈ２Ｏ，对ＣＨＢｒ３＋Ｈ２Ｏ２＋Ｏ２其光化学反应产物为ＣＯ，ＣＯ２和Ｈ２Ｏ，对ＣＨＢｒ３十Ｏ２其光化学反应产物为ＣＯ和ＣＯ２，并从这些产物推出可能发生的光化学反应。

Under simulated atmospheric conditions, thephotochemical reactions were studied in' the foursystems of CH3Br + H2O2 + O2, CH3Br + O2,CHBr3 + H2O2 + O2, and CHBr3 + O2. Irradiatedby UV at 253. 7 urn, H2O2 in these systems wasdecomposed to give OH radical which then reacted with CH3Br and CHBr3. The products of thesereactions were determinated with a FourierTransform infrared Spectroscopy in a 20 m longpath cell. As the prodllcts of photochemical reactions, CO, CO2, CH2O and H2O were detected inboth systems of CH3Br+H2O2+O2 and CH2Br+O2, CO, CO2 and H2O were detected in the system of CHBr3 +H2O2 +O2; and CO and CO2 wrerdetected in the system of CHBr3 +O2. Based onthese products, the photochemical reactionswhich possibly occurred were suggested and reasonable explanations were given.