Photocatalytic Oxidation of Ethanol During Hydrogen Generation front Water-Ethanol Mixture over Gadolinium-Doped Titania

摘要

Photocatalytic hydrogen generation from water in the presence of ethanol as a sacrificial reagent was studied over gadolinium doped TiO2 photocatalyst. Photocatalytic pathways of ethanol oxidation were studied with liquid ~1H NMR spectroscopy. The ~1H NMR results were compared with amounts of evolved hydrogen and carhon dioxide. Acetal-dehyde, acetic acid, glycolic acid and glyoxylic acid were found as major intermediates of this process, whereas carbon dioxide evolution was the last step during ethanol photooxidation process. The mechanism of ethanol photooxidation has been proposed.