文档介绍：2486 Chem. Mater. 1997, 9, 2486-2490
Effective anic Hybrid Adsorbents of Water Vapor
by the Sol-Gel Method
Julita Mrowiec-Białon´,† Andrzej B. Jarze¸bski,*,†,§ Andrzej I. Lachowski,†
Janusz J. Malinowski,† and Yuri I. Aristov‡
Institute of Chemical Engineering, Polish Academy of Sciences, 44-100 Gliwice,
Bałtycka 5, Poland; Institute of Catalysis, Russian Academy of Sciences, 630090 Novosibirsk,
Laurentieva 5, Russia; and Silesian Technical University, Department of Chemical
Engineering, 44-100 Gliwice, M. Strzody 7, Poland
Received May 7, 1997. Revised Manuscript Received August 7, 1997X
The SiO2/CaCl2 hybrid porous materials were obtained by the two-step hydrolysis and
condensation of tetraethoxysilane with (a) replacement of ethanol from alcogel by supercritical
CO2 to obtain aerogel morphology and (b) drying alcogel at ambient to obtain xerogel
structures. Aerogels and xerogels containing ∼17 and ∼30 wt % of CaCl2 (dry matter) were
prepared and investigated for adsorptivity of water vapor to obtain sorption capacities in
excess of 1 kg of water/kg of adsorbate. The adsorbates obtained can be dried and reused.
No notable loss in adsorption capacity was observed during 50 cycles.
Introduction convenient but too simple to ensure the desired end
content of the HS and its uniform distribution within
The need to improve effectiveness of heat