title: Solid-state NMR studies of the adsorption and photooxidation of ethanol on mixed TiO2--SnO2 photocatalysts.
abstract: In situ solid-state NMR methodologies have been used to investigate the photocatalytic oxidation of ethanol (CH3CH2OH) over a series of SnO2-based photocatalysts. The adsorption of ethanol on commercially available SnO2 powder was studied using both cross-polarization 13C NMR and REDOR experiments, and showed the formation of two surface ethanol species, hydrogen-bonded ethanol at surface hydroxyl groups and ethanol chemisorbed to the SnO2 surface (Sn--OCH2CH3). 13C NMR of the adsorbed ethanol was used to characterize the surface of monolayer SnO2--TiO2 coupled photocatalysts supported on porous Vycor glass. In situ solid-state NMR studies showed that the photooxidation of ethanol over the monolayer photocatalysts was slower than that over a supported TiO2 monolayer photocatalyst due to the build-up of reaction intermediates such as acetic acid on the catalyst surface. 119Sn NMR experiments characterized the tin species on the porous Vycor glass support.
authors.affiliation: 1393 Herbert C. Brown Laboratory of Chemistry, Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393, USA.
authors.forename: Sarah
authors.initials: S
authors.lastname: Pilkenton
authors.forename: Daniel
authors.initials: D
authors.lastname: Raftery
mesh_terms: D000327:Adsorption / Q000528:radiation effects; D002384:Catalysis / Q000528:radiation effects; D000431:Ethanol / Q000737:chemistry* / Q000528:radiation effects*; D008027:Light; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008422:Materials Testing / Q000379:methods; D010084:Oxidation-Reduction / Q000528:radiation effects*; D010777:Photochemistry / Q000295:instrumentation / Q000379:methods*; D017971:Tin Compounds / Q000737:chemistry* / Q000528:radiation effects; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D017971:Tin Compounds; C009495:titanium dioxide; D000431:Ethanol; D014025:Titanium; C045358:stannic oxide