Photocatalytic Oxidation of CO on TiO2: Chemisorption of O2, CO, and H2

被引：30

作者：

Dai, Wenxin ^{[1
]}

Chen, Xun ^{[1
]}

Zheng, Xiangping ^{[1
]}

Ding, Zhengxin ^{[1
]}

Wang, Xuxu ^{[1
]}

Liu, Ping ^{[1
]}

Fu, Xianzhi ^{[1
]}

机构：

[1] Fuzhou Univ, State Key Lab Breeding Base Photocatolysis, Res Inst Photocatalysis, Fuzhou 350002, Peoples R China

来源：

CHEMPHYSCHEM | 2009年 / 10卷 / 02期

基金：

中国国家自然科学基金;

关键词：

carbon monoxide; chemisorption; hydrogen; photooxidation; surface chemistry; RUTILE TIO2(110); SELECTIVE OXIDATION; SURFACE-PROPERTIES; OXYGEN VACANCIES; H-2-RICH GAS; ADSORPTION; CATALYSTS; DEFECTS; PHOTOOXIDATION; SITES;

D O I：

10.1002/cphc.200800465

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：

Photocatalytic oxidation of CO over vacuum-pretreated TiO2 is performed in a series of systems with the introduction of O-2, CO, and H, in different orders. The photocotalytic oxidation of CO is dependent on the order of introduction of O-2, CO, or H, and introducing O-2, prior to CO promotes the oxidation of CO. Moreover, an increase of reaction temperature suppresses the oxidation of CO, but the preintroduction of H, reduces this suppression effect. The results of the chemisorption of O-2, CO, and H-2. at the TiO2, surface reveal that the adsorbed O-2, heals the surface oxygen vacancy (SOV) sites of TiO2 while the adsorbed CO and H, promote the formation of new SOVs. It is proposed that changes in the amounts of adsorbed O-2, and SOVs are mainly responsible for the differences of CO conversion in different systems.

引用

页码：411 / 419

页数：9

共 32 条

[1] Single-site photocatalytic solids for the decomposition of undesirable molecules [J].