CYCLIC VOLTAMMETRIC CHARACTERIZATION OF TITANIUM SILICALITE TS-1

Cyclic voltammetry has been used to characterize the Ti4+/Ti3+ redox system in titanosilicalite TS-1. The charge imbalance resulting from the reduction of Ti4+ to Ti3+ is compensated by the electrolyte cations migrating through the porous structure of the zeolite. The maximum electrochemical current was found to be proportional to the fraction of framework Ti and independent of the structure and the crystal size of the material. The technique was very sensitive to the coordination of titanium and was used to characterize titanium-peroxo species formed by framework titanium in the presence of hydrogen peroxide.