Characterization of surface and photooxidative properties of supported metal oxide photocatalysts using solid-state NMR.
In situ solid-state NMR (SSNMR) methodologies have been used to investigate the surface properties and photooxidative reactivities of a number of metal oxide photocatalysts. Adsorption of ethanol on single monolayers of TiO2, SnO2, V205, and WO3 supported on porous Vycor glass results in the formation of hydrogen-bonded ethanol species and metal-bound ethoxide species. The chemical shift of the metal-bound ethoxide species varies with the metal oxide catalyst while the chemical shift of the hydrogen-bonded species is independent of the metal oxide. X-ray powder diffraction, UV-VIS spectroscopy, and SSNMR investigations of ethanol adsorption show that increasing the number of monolayers of TiO2 on the Vycor surface changes the morphology of the catalyst from amorphous at a single monolayer coverage to anatase at a four monolayer coverage. The rate of photocatalytic oxidation of ethanol, acetone, and 2-propanol also increases with increasing TiO2 monolayer coverage.
Pilkenton
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Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393, USA.
Xu
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Raftery
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D019840:2-Propanol / Q000737:chemistry; D000096:Acetone / Q000737:chemistry; D000327:Adsorption; D002384:Catalysis; D000431:Ethanol / Q000737:chemistry; D005898:Glass; D009682:Magnetic Resonance Spectroscopy; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D010083:Oxidants, Photochemical; D000096:Acetone; C009495:titanium dioxide; D000431:Ethanol; D014025:Titanium; D019840:2-Propanol