| 초록 |
As water vapor is one of the most undesirable impurities in many chemical processes, the demand for moisture removal from products has continuously increased. In the study, the adsorption isotherms of water vapor on alumina/zeolite 13X composite and silica gel were measured using a volumetric method. Equilibrium experiments were conducted at 293.15, 303.15 and 313.15 K and at relative pressure up to 0.95. The experimental data were correlated by Dubinin–Astakhov model and the Aranovich–Donohue model using Sips and Toth isotherms. Also, isosteric heats of adsorption were estimated by using Gibbs-Helmholtz equation and Clapeyron-Clausius equation. The adsorbed amount of water on alumina/zeolite 13X composite was higher than silica gel in low pressure range. And the order of isosteric heat of adsorption of alumina/zeolite 13X composite was higher than that of silica gel. The adsorption isotherms on alumina/zeolite 13X composite were Type II isotherms in the IUPAC classification. On the other hand, the isotherms of silica gel were classified as Type Ⅳ in the IUPAC classification. |
