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Mechanism of the spontaneous isotopic exchange between C16O2 and Ti18O2 with the involvement of oxygen vacancies. (a) Adsorption of C16O2 to the surface of Ti18O2. (b) Formation of a CO3 bidentate species. (c) Release of a C16O18O molecule. Reprinted with permission from ref (12). Copyright 2011 American Chemical Society.
