Adsorption Measurement of Chlorinated Hydrocarbons into High-silica Zeolite by Chromatographic Method

In this study, adsorption measurement of various chlorinated hydrocarbons on Y-type zeolites were performed using the chromatographic method to examine the adsorption phenomena. Dichloromethane (DCM), chloroform (TCM), trichloroethylene (TCE), and tetrachloroethylene (PCE), were used as the chlorinated hydrocarbons, and PQ-USY, USY-6.18, Na-Y, HSZ-390HUD, Pentasile-2 and Pentacil-1 were used as adsorbent. Each adsorption measurement was performed to get the heat of adsorption and the activation energy of micropore diffusivity. The amount adsorbed and isosteric heats of adsorption became low, when SiO2/Al2O3 ratio of zeolite became high. The isosteric heats of adsorption were roughly 1.4 to 2.0 of the heats of vaporization. The activation energies of diffusion in the micropore of zeolite were found to be almost 40% to 60% of the isosteric heats of adsorption.