Water Vapor Adsorption on the Sol-Gel Composites Prepared Using Ethyl Silicate 40 as a Silica Precursor

摘要

Effective mesoporous comosite adsorbents of water vapor can be prepared using a novel "one-pot", sol-gel procedure with ethyl si8icate 40 as a silica precursor. The multilayer mechanism of water adsorption appears to be responsible for high adsorption of water on the prepared samples. In the case of the lithium bromide doped samples this adsorption takes the form of a volume filling. The Dubinin-Astakhov equation very well portrays adsorption of water by the synthesized composites in relative pressure < 0.3. The vaues of the exponent r increase wiht the dopant content while thoseof the characteristic energy E are fairly constant.