Abstract
Quantitative 17O MAS NMR investigation of the 16/17O isotope exchange on pure-anatase TiO2/A and mixed-phase TiO2/A+R with an anatase to rutile ratio of 1:1 has been performed. Evaluation of the exchange kinetics hints to a strong decrease of the activation energy of this reaction on mixed-phase TiO2/A+R material (61 (A) and 70kJ/mol (R)) compared with pure-anatase TiO2/A (105kJ/mol). Furthermore, a very rapid increase of the 17O MAS NMR signals of surface oxygen species indicates a preferred 16/17O isotope exchange at these sites and a subsequently exchange with 16O framework atoms in the anatase and rutile domains.
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