In order to elucidate the effect of solvent structure on the formation of oxidation active species over TS-1, the stability of Ti-H
2O
2-solvent clusters, which are expected to be the precursor of oxidation active species, was estimated by means of the density functional theory calculation. The order of the stability, Ti-H
20
2- CH
3OH>Ti-H
2O
2-C
2H
5OH>Ti-H
2O
2-C
3H
7OH, was in agreement with that of the yield of hydroquinone and catechol for 3h in these solvent, 20.2% (CH
3OH)>6.3% (C
2H
5OH)>1.4% (C
3H
7OH). These results suggest that the co-adsorbed solvent affects the stability of H
2O
2 adsorption on Ti, and consequently determines the reaction rate.
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