N2O Adsorption and Photochemistry on High Area TiO2 Powder

The adsorption and photochemistry of N2O chemisorbed on TiO2 powder has been investigated. At 157 K, nitrous oxide is molecularly adsorbed on the reduced titanium dioxide. Adsorption on the TiO2 surface takes place through both the N and O ends of the nitrous oxide molecule. The photochemistry of th...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2001-04, Vol.105 (13), p.2596-2603
Main Authors: Rusu, C. N, Yates, J. T
Format: Article
Language:English
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Summary:The adsorption and photochemistry of N2O chemisorbed on TiO2 powder has been investigated. At 157 K, nitrous oxide is molecularly adsorbed on the reduced titanium dioxide. Adsorption on the TiO2 surface takes place through both the N and O ends of the nitrous oxide molecule. The photochemistry of the adsorbed N2O molecules was studied at 157 K by use of UV irradiation in the range 2.1−5.0 eV. The photoactivity of the adsorbed molecule is dependent on the N2O coverage. At low coverages, the adsorbed N2O is photodepleted to produce adsorbed nitrogen. Larger coverages of N2O are not photodepleted to N2 due to the site blocking in the adsorption process. N-bonded species show a higher photoreactivity than the O-bonded species. Photoformation of NO was not observed at any N2O coverage.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp0040345