Tracing the Reaction Steps Involving Oxygen and IR Observable Species in Ethanol Photocatalytic Oxidation on TiO2

被引：57

作者：

Guzman, Felipe ^{[1
]}

Chuang, Steven S. C. ^{[1
]}

机构：

[1] Univ Akron, Dept Chem & Biomol Engn, Akron, OH 44325 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 05期

关键词：

PARTICLES; KINETICS;

D O I：

10.1021/ja907256x

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The rate-determining step of ethanol photocatalytic oxidation was identified to be the adsorption of O-2 by an infrared (IR) spectroscopy coupled with mass spectrometry method. Dosing O-2 during reaction showed that adsorption of O-2 controls the accumulation of photogenerated electrons and the formation of acetate (CH3COOad-), acyl species (CH3COad), acetaldehyde (CH3CHOad), CO2, and H2O. Accumulation of CH3COOad- on the TiO2 surface slowed down the conversion of ethanol to CO2, and H2O. Removal of CH3COOad- from the TiO2 surface holds the key to accelerating the rate of ethanol photocatalytic oxidation. This Study bridges the gap between results of nanosecond and millisecond transient absorption studies and those of minute scale photocatalytic oxidation studies.

引用

页码：1502 / +

页数：3

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