Adsorption characteristics of nitrogen and oxygen onto the ion-exchanged X-type zeolites
through pressure swing adsorption (PSA) process were investigated. On the basis of Na-X zeolite, a
series of ion-exchanged X-type zeolites containing Ag, Li, Ca, Sr, Br, and K were prepared and
investigated in this work. It was revealed that the ion-exchanged X-type zeolites showed a remarkably
improved and selective adsorption capability for nitrogen. At equilibrium pressure under 0.5 atm,
adsorption capability for nitrogen was decreased in the order of Ag-X > Li-X > Sr-X > Ca-X > Na-X
> Ba-X > K-X. At equilibrium pressure over 1 atm, however, the capability was decreased in the order
of Li-X > Ag-X > Sr-X > Ca-X > Na-X > Ba-X > K-X. The Li-X zeolite exhibited the selective
adsorption capability for nitrogen in the air separation process at high pressure. The separation factor
for nitrogen/oxygen (= N2/O2) in the Li-X zeolite was ca. 13.
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