| 초록 |
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 ( = ΔN2/ΔO2) in the Li-X zeolite was ca. 13. |
