UV-enhanced exchange of O{sub 2} with H{sub 2}O adsorbed on TiO{sub 2}
- Univ. of Colorado, Boulder, CO (United States). Dept. of Chemical Engineering
Ultraviolet light dramatically increases the rate of isotope exchange between gas-phase O{sub 2} and water adsorbed on TiO{sub 2} at room temperature, but it does not affect the rate of CO{sub 2}-water exchange. Both ethanol and acetaldehyde, when coadsorbed with H{sub 2}{sup 18}O, dramatically decrease the rate of O{sub 2} exchange, but not CO{sub 2} exchange, with adsorbed H{sub 2}{sup 18}O. The decrease is attributed to a combination of competition for adsorbed oxygen between exchange and photocatalytic oxidation of the adsorbed organic and blocking of the oxygen adsorption sites by the organic. The same oxygen species participate in O{sub 2}-H{sub 2}{sup 18}O exchange and photocatalytic oxidation.
- OSTI ID:
- 316319
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 181; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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