In-situ FTIR study of adsorption and photoreactions of CH 2Cl2 on powdered TiO2

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

研究成果: Article同行評審

33 引文 斯高帕斯(Scopus)

摘要

The adsorption and photoreactions of CH2Cl2 on powdered TiO2 have been investigated by Fourier transform infrared spectroscopy. CH2Cl2 is adsorbed molecularly or dissociatively to form chloromethoxy (CClH2O(a)) at 35 °C. CClH2O(a) decomposes into CH3Oj (a) and HCOO(a) in a vacuum at temperatures higher than ~100 °C. As TiO2 in contact with gaseous CH2Cl 2 is heated in a closed cell, HCI from Cl(a) and OH (a) recombination, CH2O from CH3O(a) decomposition, and CO and CO2 from HCOO(a) decomposition are detected. In the CH2Cl2(a) photodecomposition in the absence of O2, CO(a), CO 3(a), and HCOO(a) are generated. The TiO 2-mediated CH2Cl2(a) photodecomposition is likely initiated by surface-active oxygen species instead of direct hole transfer. In the presence of O2, CH2Cl 2(a) photodecomposition is accelerated. In addition to CO(a), CO3(a), and HCOO(a), H 2O(a) and CO2(a) are generated as well. In the case of CO(a) formation, O2 is also involved in addition to TiO2 lattice oxygen. The O2 participation may be via oxygen anion species.

原文English
頁(從 - 到)3837-3843
頁數7
期刊Journal of Physical Chemistry B
107
發行號16
DOIs
出版狀態Published - 2003 4月 24

All Science Journal Classification (ASJC) codes

  • 物理與理論化學
  • 表面、塗料和薄膜
  • 材料化學

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