Functional Composition of the Surface of Thermally Modified Porous Glasses

This paper presents the results of determining the content of various acid-base sites (Brønsted basic, Brønsted acid, Lewis basic) on the inner surface of the pore space of high-silica porous glasses (PGs), obtained as a result of the through leaching of alkali borosilicate glass with a two-frame structure and modified by isothermal exposure at various temperatures in the range of 120–750°C. The relationship between changes in the content of the centers under consideration and the processes of hydroxylation and dehydroxylation of the PG surface is analyzed depending on the heat treatment temperature.