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

doi:10.1021/jp0220884

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

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 CH₂Cl_2(a) photodecomposition in the absence of O₂, CO_(a), CO _3(a), and HCOO_(a) are generated. The TiO ₂-mediated CH₂Cl_2(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), CO_3(a), and HCOO_(a), H ₂O_(a) and CO_2(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.

Original language	English
Pages (from-to)	3837-3843
Number of pages	7
Journal	Journal of Physical Chemistry B
Volume	107
Issue number	16
DOIs	https://doi.org/10.1021/jp0220884
Publication status	Published - 2003 Apr 24

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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@article{0d9e46a81af24e7d9203371c8f2c826a,

title = "In-situ FTIR study of adsorption and photoreactions of CH 2Cl2 on powdered TiO2",

abstract = "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.",

author = "Chen, {Meng Tso} and Lien, {Chen Fu} and Liao, {Li Fen} and Lin, {Jong Liang}",

year = "2003",

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T1 - In-situ FTIR study of adsorption and photoreactions of CH 2Cl2 on powdered TiO2

AU - Chen, Meng Tso

AU - Lien, Chen Fu

AU - Liao, Li Fen

AU - Lin, Jong Liang

PY - 2003/4/24

Y1 - 2003/4/24

N2 - 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.

AB - 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.

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