Adsorption and reactions of CH2Br2 on TiO2:: Effects of H2O and O2

被引：10
|
作者：
Chen, MT
Lin, YF
Liao, LF
Lien, CF
Lin, JL
机构：
[1] Department of Chemistry, National Cheng Kung University, Tainan
来源：
INTERNATIONAL JOURNAL OF PHOTOENERGY | 2004年 / 6卷 / 01期
关键词：
D O I：
10.1155/S1110662X04000066
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The adsorption, thermo- and photo-reactions of CH2Br2 on powdered TiO2 as well as the effects of H2O and/or O-2 have been studied by Fourier-transform infrared spectroscopy. CH2Br2 is adsorbed molecularly on the surface at 35degreesC, interacting with the surface OH groups. It is completely desorbed or decomposes to form CH3O(a) and HCOO(a) in a vacuum by 250degreesC, probably via dioxymethylene (-OCH2O-). The presence of adsorbed H2O accelerates the formation of CH3O( a) and HCOO( a) from CH2Br2 dissociation. Adsorbed CH2Br2 decomposes to form CO(a), HCOO(a), CO3(a), and/or CO2(a) under 400 nm irradiation, depending on whether the presence of H2O and/ or O-2. The presence of O-2 increases the photoreaction rate of CH2Br2(a) and the photodecomposition is further accelerated with addition of H2O.
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页码：35 / 41
页数：7
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