CARBON DIOXIDE ADSORBENT CAPABLE OF ADSORPTION/DESORPTION IN DEPENDENCE ON PRESSURE OF ATMOSPHERIC PRESSURE OR HIGHER

摘要

An adsorbent adapted to adsorb carbon dioxide upon an increase of pressure and to carry out 10 wt.% or more adsorption/desorption without vacuuming, etc. with respect to the adsorbed carbon dioxide by lowering the pressure so as to fall within the range of 100 to 900 kPa at atmospheric pressure or higher. The adsorbent comprises an amorphous aluminum silicate of 0.7 to 1 Si/Al ratio having a peak around the region of -78 to -87 ppm in its ²⁹Si solid NMR spectrum. This adsorbent is capable of carrying out 10 wt.% or more adsorption/desorption at a pressure falling within the range of 100 to 900 kPa and finds major application in the use as a carbon dioxide adsorbent in a pressure swing adsorption method.