Equilibrium and dynamic adsorption isotherms of water vapor on silica gels

  • Leni L. Quirit Natural Sciences Research Institute & Institute of Chemistry, University of the Philippines, Quezon City
  • Elma C. Llaguno Natural Sciences Research Institute & Institute of Chemistry, University of the Philippines, Quezon City
Keywords: silica gel, water vapor adsorption isotherms, surface areas, heats and energies of adsorption

Abstract

Static adsorption isotherms of water vapor on five silica gel samples were obtained using saturated salt solutions in a closed isothermal environment. The results were compared to dynamic isotherms generated by a fabricated set-up utilizing flowing streams of wet and dry air mixtures. Mathematical modeling of the isotherms data was used to calculate adsorbent surface characteristics and thermodynamic parameters. Conclusions based on isotherm shapes, possible pore sizes, energies of adsorption and heats of adsorption were comparable for the dynamic and static results. Surface areas however, differed by a dynamic to static factor of 1.3 to 2.0 for three silica gel samples. The surface areas from the water vapor static isotherms were within literature values of the range of surface areas from static nitrogen gas isotherms of commercial silica gels.
Published
2003-12-01
How to Cite
Quirit, L. L., & Llaguno, E. C. (2003). Equilibrium and dynamic adsorption isotherms of water vapor on silica gels. KIMIKA, 19(2), 83-89. https://doi.org/10.26534/kimika.v19i2.83-89
Section
Research Articles