Abstract
Twenty three kinds of metal oxides were screened as supports for Au nanoparticles (Au NPs) in the gas phase oxidation of ethanol. Mild oxidation to acetaldehyde, which is economically preferable, is catalyzed by Au NPs deposited on catalytically inert metal oxides, in particular, strongly acidic MoO3 or weakly basic La2O3. Deep oxidation to acetic acid takes place over Au NPs deposited on n-type semiconductive metal oxides such as ZnO and V2O5, which exhibit a little catalytic activity for ethanol oxidation at 200 °C. Complete oxidation to CO2 and H2O preferentially takes place over p-type semiconductive metal oxides such as MnO2 and Co3O4, and CeO2 which has oxygen-storage and discharge capability. These metal oxides show catalytic activity for ethanol oxidation even at 100 °C producing mainly acetaldehyde, and their catalytic activity is noticeably enhanced in the conversion of ethanol and the selectivity to CO2 by the deposition of Au NPs. The wide range of product tunability can be explained by the adsorption structures of ethanol and by the reactivities of oxygen species on the metal oxide supports.
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