To determine the role of acid-base sites on GaInTiO2, ammonia and acetaldehyde adsorption were examined at different temperatures using a specially designed ultra-high vacuum (UHV) infrared cell.  The UHV cell is attached to a vacuum manifold which is continually pumped by a 60 L turbomolecular pump and a diaphragm roughing pump to obtain a routine pressure of 1x10-8 Torr.  It was found that at 233 K, acetaldehyde adsorbed through hydrogen bonding to surface hydroxyl groups as well as through Lewis acid sites over pretreated GaInTiO2 surface.  The formation of 2-butenal was observed as the product of aldol condensation reaction.  This C-C bond formation is found to be due to the presence of Bronsted and Lewis acid sites.  Upon controlling these sites with NH3 adsorption, the C-C bond formation can be totally suppressed, which in turn indicates that acid sites indeed are responsible for C-C bond formation.

Spectroscopic investigation of the role of acid-base sites toward C-C bond formation on TiO<sub>2</sub>-based nanomaterials

247th National Meeting (2014)

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Spectroscopic investigation of the role of acid-base sites toward C-C bond formation on TiO2-based nanomaterials

Spectroscopic investigation of the role of acid-base sites toward C-C bond formation on TiO₂-based nanomaterials