Anomalous adsorption of nitrogen and argon in silver exchanged zeolite A

A new adsorbent based on zeolite AgA having N2 adsorption capacity of 22.3 cc g–1 at 101.3 kPa and N2/O2 selectivity in the range of 5 to 14.6 at 303 K, the highest known so far for any zeolite A type of adsorbent, is reported; furthermore, this adsorbent also shows argon selectivity over oxygen.