Water Adsorption on AQSOA-FAM-Z02 Beads

Water/AQSOA-FAM-Z02 adsorption equilibrium data have been measured using two gravimetric systems at 30 degrees C, 50 degrees C, and 70 degrees C in the range 1-90% relative humidity (RH). The data were found to conform to a type IV adsorption isotherm and have been correlated with the Rigid Adsorbent Lattice Fluid dual site model in the range 1-50% RH, which has been shown to reproduce the experimental results with an average absolute deviation in line with uncertainties measured from duplicate and replicate experiments. The adsorption and desorption data were found not to overlap even at 1% RH, resulting in an open hysteresis under the experimental conditions studied. The Rigid Adsorbent Lattice Fluid dual site model adapted to take into account a nondesorbing fraction of pores reproduced the experimental desorption curves providing an overall description of the system for use in adsorption process simulations. The isosteric heats of adsorption obtained show a complex concentration dependence with a local maximum (84.2 kJ mol(-1)) and minimum (55.8 kJ mol(-1)) which are values consistent with the ranges found in the literature.

Automated summary

This study measured the adsorption equilibrium data of Water/AQSOA-FAM-Z02 using two gravimetric systems under different temperatures and humidity levels. It was found that the data conformed to the IV type adsorption isotherm. The Rigid Adsorbent Lattice Fluid dual site model used in the study was able to reproduce the experimental results and showed an open hysteresis at 1% RH. The improved model, which considered the non-desorbing fraction of pores, successfully reproduced the experimental desorption curves. The obtained isosteric heats of adsorption exhibited a complex concentration dependence.