Adsorption of hidrogen peroxide on the surface of silica – titania mixed oxide obtained by the sol-gel processing method
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to heat treatment a 773 K, STC. SEM and EDS images show, within magnification used, a uniform
distribution of the TiO 2 particles in SiO 2 /TiO 2 matrix. Both, ST and STC adsorb hydrogen peroxide on the
surface and through EPR and UV-Vis diffuse reflectance spectra, it was possible to conclude that the
species on the surface is the peroxide molecule attached to the Lewis acid site of titanium particle
surface, α Ti(H 2 O 2 ) + . As the material is very porous, presumably the hydrogen peroxide molecule is
confined in the matrix pores on the surface, a reason why the adsorbed species presents an exceptional
long lived stability.
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