Abstract
A detailed characterization of catalysts prepared within zeolite cavities and their photocatalytic reactivities have been investigated usingin situ photo-luminescence, diffuse reflectance absorption, XAFS (XANES and FT-EXAFS) and ESR techniques. With the Ag+/ZSM-5 catalyst, it was found that Ag+ ions are highly dispersed in an isolated state within the zeolite cavities. UV irradiation of the Ag+/ZSM-5 catalyst in the presence of NO leads to the decomposition of NO into N2, O2 and N2O at 275 K. Dynamic studies show that the electron transfer from the excited state of the Ag+ ions (4d95s1) plays a significant role in initiating the decomposition of NO. Titanium oxide catalysts prepared within the Y-zeolite cavities via an ion-exchange method exhibit high and unique photocatalytic reactivities for the decomposition of NO into N2 and O2 as well as the reduction of CO2 with H2O showing a high selectivity for the formation of CH3OH. It was also found that the charge transfer excited state of the titanium oxide species, (T3+ -O-)*, plays a vital role in these unique photocatalytic reactions.
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