Adsorption of Organics onto High Silica Zeolite

Abstract Liquid phase adsorption equilibria of aromatic species onto high silica zeolite pellets were determined by the so-called batch bottle technique at 298.2K. While benzene compounds showed unfavorable S-shape isotherm, isotherms of pyridine compounds were favorable-types. Because phenyl compounds among adsorbates used here have negative charge within the ring and pyridine compounds have positive charge within the ring, thus-electrostatic affinity seems to be the main factors of adsorbate dependency of isotherms. For the same systems, concentration decay curves were obtained by agitated batch technique at 298.2K. By comparison of the curves with theoretical one, apparent intraparticle diffusivity was determined. Phenols and aminopyridine showed constant diffusivities based on bulk phase concentration difference. For methylpyridine systems, concentration dependency appeared and mass transfer resistance other than molecular diffusion seemed to affect the dependency.