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Ethanol is a prototype molecule used in probing catalytic reactivity of oxide catalysts such as . In the present study, we adsorbed ethanol on (001) at room temperature (RT) and the corresponding bonding state of ethanol was systematically studied by x-ray photoemission spectroscopy (XPS) using synchrotron radiation. Especially, we compared (001) surfaces prepared in ultra-high vacuum (UHV) with different surface treatments such as -sputtering and oxidation with molecular , respectively. We find that the saturation coverage of ethanol at RT varies depending on the amount of reduced surface defects (e.g., ) which are introduced by -sputtering. We also find that the oxidized (001) surface has other type of surface defects (not related to Ti 3d state) which can dissociate ethanol for further reaction above 600 K. Our C 1s core level spectra indicate clearly resolved features for the two chemically distinct carbon atoms from ethanol adsorbed on (001), showing the adsorption of ethanol proceeds without C-C bond dissociation. No other C 1s feature for a possible oxidized intermediate was observed up to the substrate temperature of 650 K.

Photoemission Study on the Adsorption of Ethanol on Chemically Modified TiO2(001) Surfaces

Photoemission Study on the Adsorption of Ethanol on Chemically Modified TiO₂(001) Surfaces