CYCLIC VOLTAMMETRIC CHARACTERIZATION OF TITANIUM SILICALITE TS-1

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