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

被引：136

作者：

Liao, LF ^{[1
]}

Wu, WC ^{[1
]}

Chen, CY ^{[1
]}

Lin, JL ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Chem, Tainan 701, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2001年 / 105卷 / 32期

关键词：

D O I：

10.1021/jp003541j

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 O-2. 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.

引用

页码：7678 / 7685

页数：8

共 37 条

[1] PHOTOCATALYSIS ON NATIVE AND PLATINUM-LOADED TIO2 AND ZNO CATALYSTS-ORIGIN OF DIFFERENT REACTIVITIES ON WET AND DRY METAL-OXIDES [J].