Aluminum silicate complex and high performance adsorbent comprising the complex

摘要

Provided is an adsorbent having superior adsorption properties for use as a dehumidifying agent for desiccant air conditioning which exhibits high adsorption properties at mid and high humidity ranges, and for use as a gas adsorbent of carbon dioxide, ammonia, formaldehyde and the like. A precursor suspension having a Si/Al ratio of 0.70 to 1.0 is prepared, and the precursor suspension is subsequently heated at 110°C or higher for 2 days to synthesize a complex of a layered low-crystalline clay mineral and an amorphous aluminum silicate. The obtained complex of the layered low-crystalline clay mineral and the amorphous aluminum silicate yields excellent water vapor adsorption performance of 45 wt% or more at a relative humidity of 60%, and therefore can be used as an adsorbent for desiccant air conditioning. The complex also yields excellent carbon dioxide absorption/desorption performance of 12 wt% or more at 100 kPa to 900 kPa, and therefore can be used as a gas adsorbent for gas such as ammonia and formaldehyde.