The kinetics of water desorption from porous glasses |
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| Authors: | V Dondur D Fidler B Adnadjević V Rakić |
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| Institution: | 1. Institute of Physical Chemistry, Faculty of Science and Matematics, Belgrade University, P.O. Box 550, Belgrade, Yugoslavia
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| Abstract: | The kinetics of water desorption from porous glasses silica gel and porous aluminosilicates were followed through the TG and DTG methods. In all cases only one thermodesorption peak appeared. The kinetic parameters were determined by standard nonisothermal methods. The activation energy is constant and independent of the coverage degree and pore diameter in the system porous glass-water. The functionE(θ) were determined for the silica gel and porous aluminosilicatesE=E 0+a exp (-bθ). The parametersE 0,a andb depend on the SiO2/Al2O3 ratio and on the distribution of active centers on the surface. |
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