Photooxidation of formic acid vs formate and ethanol vs ethoxy on TiO2 and effect of adsorbed water on the rates of formate and formic acid photooxidation

Li Fen Liao; Wen Chun Wu; Chia Yuan Chen; Jong Liang Lin

doi:10.1021/jp003541j

Photooxidation of formic acid vs formate and ethanol vs ethoxy on TiO₂ and effect of adsorbed water on the rates of formate and formic acid photooxidation

Li Fen Liao, Wen Chun Wu, Chia Yuan Chen, Jong Liang Lin

Department of Chemistry

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

141 Citations (Scopus)

Abstract

Comparison of photooxidation rates of formic acid and formate on TiO₂ as well as the effect of adsorbed water on formate and formic acid photodecomposition rates have been investigated by Fourier transformed infrared spectroscopy. Adsorbed formic acid and formate are all photooxidized to CO₂ in O₂. Formic acid on TiO₂ shows a photoreaction rate that is roughly 53 times that of formate groups for a same surface concentration. The presence of H₂O can increase formate and formic acid photooxidation rates by a factor close to 2. In addition, photochemistry of adsorbed ethanol and ethoxy is also compared. It is found that ethanol is important for the formation of acetaldehyde, while ethoxy groups are photooxidized to adsorbed acetate, formate, and water. Possible reasons for these differences are discussed.

Original language	English
Pages (from-to)	7678-7685
Number of pages	8
Journal	Journal of Physical Chemistry B
Volume	105
Issue number	32
DOIs	https://doi.org/10.1021/jp003541j
Publication status	Published - 2001 Aug 16

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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abstract = "Comparison of photooxidation rates of formic acid and formate on TiO2 as well as the effect of adsorbed water on formate and formic acid photodecomposition rates have been investigated by Fourier transformed infrared spectroscopy. Adsorbed formic acid and formate are all photooxidized to CO2 in O2. Formic acid on TiO2 shows a photoreaction rate that is roughly 53 times that of formate groups for a same surface concentration. The presence of H2O can increase formate and formic acid photooxidation rates by a factor close to 2. In addition, photochemistry of adsorbed ethanol and ethoxy is also compared. It is found that ethanol is important for the formation of acetaldehyde, while ethoxy groups are photooxidized to adsorbed acetate, formate, and water. Possible reasons for these differences are discussed.",

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T1 - Photooxidation of formic acid vs formate and ethanol vs ethoxy on TiO2 and effect of adsorbed water on the rates of formate and formic acid photooxidation

AU - Liao, Li Fen

AU - Wu, Wen Chun

AU - Chen, Chia Yuan

AU - Lin, Jong Liang

PY - 2001/8/16

Y1 - 2001/8/16

N2 - Comparison of photooxidation rates of formic acid and formate on TiO2 as well as the effect of adsorbed water on formate and formic acid photodecomposition rates have been investigated by Fourier transformed infrared spectroscopy. Adsorbed formic acid and formate are all photooxidized to CO2 in O2. Formic acid on TiO2 shows a photoreaction rate that is roughly 53 times that of formate groups for a same surface concentration. The presence of H2O can increase formate and formic acid photooxidation rates by a factor close to 2. In addition, photochemistry of adsorbed ethanol and ethoxy is also compared. It is found that ethanol is important for the formation of acetaldehyde, while ethoxy groups are photooxidized to adsorbed acetate, formate, and water. Possible reasons for these differences are discussed.

AB - Comparison of photooxidation rates of formic acid and formate on TiO2 as well as the effect of adsorbed water on formate and formic acid photodecomposition rates have been investigated by Fourier transformed infrared spectroscopy. Adsorbed formic acid and formate are all photooxidized to CO2 in O2. Formic acid on TiO2 shows a photoreaction rate that is roughly 53 times that of formate groups for a same surface concentration. The presence of H2O can increase formate and formic acid photooxidation rates by a factor close to 2. In addition, photochemistry of adsorbed ethanol and ethoxy is also compared. It is found that ethanol is important for the formation of acetaldehyde, while ethoxy groups are photooxidized to adsorbed acetate, formate, and water. Possible reasons for these differences are discussed.

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Photooxidation of formic acid vs formate and ethanol vs ethoxy on TiO₂ and effect of adsorbed water on the rates of formate and formic acid photooxidation

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