2019 Volume 52 Issue 2 Pages 210-214
Aluminophosphate molecular sieves (AlPO-5) were substituted with seven metals (Ca, Co, Mg, Ni, Sr, Cr and Fe). From XRD measurement, all patterns of seven substituted AlPO-5 were identical to that of the AFI structure. Except for Cr substituted AlPO-5, they were mainly in a hexagonal pillar structures based on the SEM images. For Mg, Ni, Sr and Fe substituted AlPO-5, the water adsorption capacity at 30°C and the difference in the amount of adsorbed water between 30°C (adsorption temperature) and 100°C (desorption temperature) increased by the substitution. Although, for Fe substituted AlPO-5, the initial water adsorption rate was slightly decreased by the substitution, the water desorption temperature was equal for the temperature of AlPO-5. This is because Fe substituted AlPO-5 had about 1.8 times water adsorption capacity at 30°C and was able to be regenerated at 100°C, Fe substituted AlPO-5 was the most advantageous adsorbents.