Preparation and Permeation Properties of PESU-Based Mixed Matrix Membranes with Nano-Sized CHA Zeolites

摘要

CHA-type SAPO-34 and SSZ-13 zeolites with different homogeneous crystal sizes were prepared and used as fillers for fabricating polyethersulfone (PESU) based mixed matrix membranes (MMMs). These CHA-type crystals and the obtained MMMs were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). H_(2), N_(2), CO_(2) and CH_(4) gas permeation properties of MMMs with 20% and 30% zeolite weight loadings were investigated at 35°C under the pressure drop of 0.3?MPa. All gas permeabilities were enhanced after filling these zeolites into PESU polymer. The defective MMMs were formed when using the smallest 100?nm SAPO-34 crystals. High permselectivity MMMs were obtained with 200?nm SAPO-34 crystals, and high gas permeability MMMs were obtained when filled with 400?nm SSZ-13 zeolites.