Journal of Chemical Engineering of Japan, Vol.52, No.2, 210-214, 2019
Enhancement of Water Adsorption-desorption Performance of Aluminophosphate Molecular Sieves (AIPO-5) Substituted with Several Metals
Aluminophosphate molecular sieves (AIPO-5) were substituted with seven metals (Ca, Co, Mg, Ni, Sr, Cr and Fe). From XRD measurement, all patterns of seven substituted AIPO-5 were identical to that of the AFI structure. Except for Cr substituted AIPO-5, they were mainly in a hexagonal pillar structures based on the SEM images. For Mg, Ni, Sr and Fe substituted AIPO-5, the water adsorption capacity at 30 degrees C and the difference in the amount of adsorbed water between 30 degrees C (adsorption temperature) and 100 degrees C (desorption temperature) increased by the substitution. Although, for Fe substituted AIPO-5, the initial water adsorption rate was slightly decreased by the substitution, the water desorption temperature was equal for the temperature of AIPO-5. This is because Fe substituted AIPO-5 had about 1.8 times water adsorption capacity at 30 degrees C and was able to be regenerated at 100 degrees C, Fe substituted AIPO-5 was the most advantageous adsorbents.