AMORPHOUS ALUMINUM SILICATE HAVING EXCELLENT MOISTURE ADSORPTION/DESORPTION CHARACTERISTICS IN MEDIUM HUMIDITY RANGE

摘要

PROBLEM TO BE SOLVED: To provide an adsorbent having excellent adsorption performance in a relative humidity range of 5-60%. SOLUTION: An amorphous aluminum silicate having peaks around -78 and -87 ppm in29Si solid NMR spectra is synthesized by setting the Si/Al ratio in a mixture solution at 0.7-1, which is higher than in the condition for synthesizing imogolite or amorphous imogolite, adjusting the pH to 6-8 with an acid or an alkali, and performing desalting and heating. The resultant amorphous aluminum silicate has an excellent water vapor adsorption performance of 30 wt.% or more in the relative humidity of 5-60%, and can be used as a desiccant air conditioning adsorbent. COPYRIGHT: (C)2008,JPO&INPIT