The adsorption and photochemistry of N 2 O chemisorbed on TiO 2 powder has been investigated. At 157 K, nitrous oxide is molecularly adsorbed on the reduced titanium dioxide. Adsorption on the TiO 2 surface takes place through both the N and O ends of the nitrous oxide molecule. The photochemistry of the adsorbed N 2 O 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 N 2 O coverage. At low coverages, the adsorbed N 2 O is photodepleted to produce adsorbed nitrogen. Larger coverages of N 2 O are not photodepleted to N 2 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 N 2 O coverage.
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Rusu et al. (2001) studied this question.
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