In situ FT-IR studies of NO decomposition on Pt/TiO2 catalyst under UV irradiation

被引：5
|
作者：
Lee, BJ
Kuo, MC
Chien, SH [1 ]
机构：
[1] Acad Sinica, Inst Chem, Taipei 11529, Taiwan
[2] Natl Taiwan Univ, Dept Chem, Taipei 10764, Taiwan
来源：
RESEARCH ON CHEMICAL INTERMEDIATES | 2003年 / 29卷 / 7-9期
关键词：
D O I：
10.1163/156856703322601825
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Photodecomposition of NO on the well-dispersed Pt/TiO2 catalyst under UV irradiation was studied by in situ DRIFT (Diffuse-Reflectance Infrared Fourier-Transform) spectroscopy. 2 wt% Pt/TiO2 catalyst was prepared by photochemical deposition method. The photocatalytic activity of Pt/TiO2 is highly dependent on its pretreatment. Although the catalyst exhibited a highly adsorption capability to NO after hydrogen reduction or thermal evacuation at 500degreesC, no evidence upon NO decomposition was observed under UV irradiation. While reducing the catalyst at 300degreesC in the hydrogen flow, it not only exhibited an intense NO adsorption but also conducted a direct decomposition of NO to N-2 and O-2 under UV irradiation. The hydrogen reduction at 200degreesC led to a weaker NO adsorption. During UV irradiation, the IR peaks of NO fully disappeared and N2O was formed. It is concluded that the photochemical prepared Pt/TiO2 catalyst after activating at mild reduction conditions is highly active for NO photodecomposition. The effective oxidation states of the active components, the surface structure and the reaction mechanisms will be discussed.
引用
收藏
页码：817 / 826
页数：10
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