Ch2I2 adsorption and reactions on TiO2

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

doi:10.1039/b212387h

Ch₂I₂ adsorption and reactions on TiO₂

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

Department of Chemistry

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

4 Citations (Scopus)

Abstract

Fourier-transform infrared spectroscopy has been employed to study the adsorption, thermal transformation, and photoreactions of CH₂I₂ on powdered TiO₂. At 35 °C, CH₂I₂ is adsorbed molecularly or dissociatively to form a surface species with CH_x and C-O functional groups possibly derived from C-I bond scission of CH₂I₂. As the surface temperature is raised above 100°C, the adsorbed CH₂I₂ is transformed into CH₃O_(a) and HCOO_(a) simultaneously, very likely via disproportionation of the reaction intermediate of dioxymethylene (-OCH₂O-). Under UV irradiation in the presence of O₂, adsorbed CH₂I₂ on TiO₂ decomposes to form CO_(a), HCOO_(a), H₂O_(a), and CO_2(g). But the CH₂I₂ photoreaction is almost terminated in the absence of O₂. The possible initiation species involved in the CH₂I₂ photodecomposition is discussed.

Original language	English
Pages (from-to)	1912-1916
Number of pages	5
Journal	Physical Chemistry Chemical Physics
Volume	5
Issue number	9
DOIs	https://doi.org/10.1039/b212387h
Publication status	Published - 2003 May 1

All Science Journal Classification (ASJC) codes

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1039/b212387h

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title = "Ch2I2 adsorption and reactions on TiO2",

abstract = "Fourier-transform infrared spectroscopy has been employed to study the adsorption, thermal transformation, and photoreactions of CH2I2 on powdered TiO2. At 35 °C, CH2I2 is adsorbed molecularly or dissociatively to form a surface species with CHx and C-O functional groups possibly derived from C-I bond scission of CH2I2. As the surface temperature is raised above 100°C, the adsorbed CH2I2 is transformed into CH3O(a) and HCOO(a) simultaneously, very likely via disproportionation of the reaction intermediate of dioxymethylene (-OCH2O-). Under UV irradiation in the presence of O2, adsorbed CH2I2 on TiO2 decomposes to form CO(a), HCOO(a), H2O(a), and CO2(g). But the CH2I2 photoreaction is almost terminated in the absence of O2. The possible initiation species involved in the CH2I2 photodecomposition is discussed.",

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

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T1 - Ch2I2 adsorption and reactions on TiO2

AU - Liao, Li Fen

AU - Lien, Chen Fu

AU - Chen, Meng Tso

AU - Lin, Yu Feng

AU - Lin, Jong Liang

PY - 2003/5/1

Y1 - 2003/5/1

N2 - Fourier-transform infrared spectroscopy has been employed to study the adsorption, thermal transformation, and photoreactions of CH2I2 on powdered TiO2. At 35 °C, CH2I2 is adsorbed molecularly or dissociatively to form a surface species with CHx and C-O functional groups possibly derived from C-I bond scission of CH2I2. As the surface temperature is raised above 100°C, the adsorbed CH2I2 is transformed into CH3O(a) and HCOO(a) simultaneously, very likely via disproportionation of the reaction intermediate of dioxymethylene (-OCH2O-). Under UV irradiation in the presence of O2, adsorbed CH2I2 on TiO2 decomposes to form CO(a), HCOO(a), H2O(a), and CO2(g). But the CH2I2 photoreaction is almost terminated in the absence of O2. The possible initiation species involved in the CH2I2 photodecomposition is discussed.

AB - Fourier-transform infrared spectroscopy has been employed to study the adsorption, thermal transformation, and photoreactions of CH2I2 on powdered TiO2. At 35 °C, CH2I2 is adsorbed molecularly or dissociatively to form a surface species with CHx and C-O functional groups possibly derived from C-I bond scission of CH2I2. As the surface temperature is raised above 100°C, the adsorbed CH2I2 is transformed into CH3O(a) and HCOO(a) simultaneously, very likely via disproportionation of the reaction intermediate of dioxymethylene (-OCH2O-). Under UV irradiation in the presence of O2, adsorbed CH2I2 on TiO2 decomposes to form CO(a), HCOO(a), H2O(a), and CO2(g). But the CH2I2 photoreaction is almost terminated in the absence of O2. The possible initiation species involved in the CH2I2 photodecomposition is discussed.

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Ch₂I₂ adsorption and reactions on TiO₂

Abstract

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