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1135725495

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The previous studies on the interactions of acetaldehyde with TiO2(001) surfaces,however, indicated that aldol condensation occurs on both{011}
- and{114}-faceted TiO2(001) surfaces and that aldol condensation, although a bimolecular reaction, is relatively insensitive to the surface structures based on the comparison of the results obtained from the {011}- and{114}-facetedsurfaces. The{011}-faceted surface, in their studies, was thought to be a fully oxidized surface exposing only five-coordinated cations. The STM study, however, showed a certain number of mixed coordination sites on the same surface. Comparing the results obtained in this study with the interpretations of the previous studies, and assuming that the STM results revealed the correct structural information on the{011}-faceted surface, we suggest that the nonuniform cation sites on the fully oxidized surfaces are responsible for the initiation of aldol condensation.The{011}- and{114}-faceted surfaces containing four-, five-,and six-coordinated cations are capable of initiating aldol condensation, whereas the fully oxidized SrTiO3(100) surface lacks unsaturated cation sites and is, therefore, inert to aldol condensation. Thus, the enhanced reactivity of CH3CHO on theTiO2(100) surfaces can be related to the unique structures of the faceted TiO2 (001) surfaces that possess a variety of surface sites, many of which are very active toward the reactions of
organic molecules adsorbed on these surfaces.
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