Abstract
Chabazite with Si/Al of 2.4 ratio was synthesized and exchanged with cations viz. K+, Li+ and Ca2 +. N2, O2 and Ar adsorption isotherms were measured in the pressure range 0–1000 torr and temperatures viz. 0, 30 and 50 ∘C. K-CHA showed better O2/Ar selectivity than Ca-CHA although adsorption capacity was larger for Ca-CHA. Zero loading isosteric heat of adsorption values for K-CHA, were considerably lower than Ca-CHA which reflect diminished charge density of the K cation. The high O2/Ar selectivity is possibly due to partial pore blockage as a result of the large potassium cation located near the 8-member ring leading to the 20-hedron cage. The O2/Ar selectivity may be exploited to produce high purity oxygen (> 99%) from a two stage PSA system employing K-CHA in the second stage.
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