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

In situ FT-IR studies of NO decomposition on Pt/TiO2 catalyst under UV irradiation 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 500°C, no evidence upon NO decomposition was observed under UV irradiation. While reducing the catalyst at 300°C in the hydrogen flow, it not only exhibited an intense NO adsorption but also conducted a direct decomposition of NO to N2 and O2 under UV irradiation. The hydrogen reduction at 200°C 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

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

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Publisher
Springer Netherlands
Copyright
Copyright © 2003 by Springer
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856703322601825
Publisher site
See Article on Publisher Site

Abstract

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 500°C, no evidence upon NO decomposition was observed under UV irradiation. While reducing the catalyst at 300°C in the hydrogen flow, it not only exhibited an intense NO adsorption but also conducted a direct decomposition of NO to N2 and O2 under UV irradiation. The hydrogen reduction at 200°C 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.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jul 8, 2009

References

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