Chromatographic Adsorption Measurement of Chlorinated Hydrocarbons into Y-Type High Silica Zeolite

Abstract

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 and Pentasile-2 were used as adsorbent. Each adsorption measurement was performed to get the heat of adsorption and the activation energy of micro pore 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.