Adsorption characteristics of AQSOA zeolites and water for adsorption chillers

In this article, the authors presented the characterization and property evaluation of AQSOA zeolites by various experimental methods including X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), N2 adsorption/desorption isotherms and thermo gravimetric analysis (TGA). The amount of H2O uptakes on AQSOA-Z01 and AQSOA-Z02 were measured for the temperatures of 298 K, 313 K and 338K. It was found that the water vapor adsorption isotherm of AQSOA-Z01 was characterized by S-shape with hydrophobic behavior at the beginning of adsorption or low pressures. The enthalpies of adsorption (Q(st)) for AQSOA zeolites + water were calculated employing Clausius Clapeyron relations via experimentally measured adsorption isotherms data. The Q(st) derived from various adsorption isotherm models were also added for comparison purposes. It was found that the porous structure of AQSOA-Z01 exhibits a high H2O vapor uptakes and delivered 0.1 kg of water per kg of zeolite for one adsorption desorption cycle even at the desorption temperature of 65 degrees C. (C) 2015 Elsevier Ltd. All rights reserved.