Preparation of the Thermo-Activated Silica TSi Samples

As a rule, the silica surface is covered with a layer of silanol groups (=Si-0-H) and adsorbed water, which can be removed by drying at temperatures of 600K [5,6]. With a rise in temperature, the concentration of silanol 

These reactions proceed even at 300 K at a vapor pressure of 10 2Torr. Hence, their activation energies do not exceed few kilocalories per mole. 

On the basis of the spectral and kinetic data, these groups were ascribed cyclic four-member structure (=Si-0)2Si 02 Si(0-Si=) [4]. This allows one to refine the structure of the reaction products  

The hypothesis for a possible stabilization of such groups at the silica surface was proposed by Perry in 1966 [7]. 

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