Adsorption and reactions of CH2Br2 on TiO 2: Effects of H2O and O2

Meng Tso Chen, Yu Feng Lin, Li Fen Liao, Chen Fu Lien, Jong Liang Lin

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8 Citations (Scopus)

Abstract

The adsorption, thermo- and photo-reactions of CH2Br2 on powdered TiO2 as well as the effects of H2O and/or O2 have been studied by Fourier-transform infrared spectroscopy. CH2Br2 is adsorbed molecularly on the surface at 35 °C, interacting with the surface OH groups. It is completely desorbed or decomposes to form CH3O(a) and HCOO(a) in a vacuum by 250 °C, probably via dioxymethylene (-OCH2O-). The presence of adsorbed H2O accelerates the formation of CH 3O(a) and HCOO(a) from CH2Br 2 dissociation. Adsorbed CH2Br2 decomposes to form CO(a), HCOO(a), CO3(a), and/or CO 2(a) under 400nm irradiation, depending on whether the presence of H2O and/or O2. The presence of O2 increases the photoreaction rate of CH2Br2(a) and the photodecomposition is further accelerated with addition of H2O.

Original languageEnglish
Pages (from-to)35-41
Number of pages7
JournalInternational Journal of Photoenergy
Volume6
Issue number1
DOIs
Publication statusPublished - 2004

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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