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capacity, CEC) by creating zeolites with high aluminum content, and (2) by synthesizing zeolites containing various combinations of alkaline and alkaline earth cations. Kuhl reported a procedure for the synthesis of low silica X-type zeolite (LSX). This material is an aluminum saturated X-type zeolite with a silica-to-alumina ratio of 2.0 (or Si/Al = 1.0).3 Commercial X-zeolite, which is typically available as the Na+ form (known commercially as 13X), is not aluminum saturated and contains 86 aluminum atoms per unit cell, while the LSX zeolite contains 96 aluminum atoms per unit cell. Silver is known to strongly influence the adsorption characteristics of some aluminosilicate zeolites. Habgood measured isotherms for N2, O2, C2H6 and C2H4 adsorbed on Ag-X zeolite and compared to those same gas isotherms measured on alkali and alkaline earth cation exchanged X zeolite.4 The author points out that the alkali and alkaline earth cations are all of a stable noble metal electronic configuration whereas the d orbitals of the silver ion give it much more intense directional properties. The author concluded that the silver ion has a much stronger polarizing power than the sodium ion which is of the same total charge and very similar in size. Huang measured adsorption of CO, N2, O2, CO2 and C2H4 on Ag-X and Ag-Y zeolites.5 Yang et al. reported the synthesis of a mixed Li/Ag ion-exchanged X-type zeolite (Si/Al = 1.25 with approximately 17 Ag+ per unit cell), and discussed its possible superior properties for air separation.6 This sorbent utilized the very strong adsorptive properties of the Ag+ ion which provided for increased capacity over that of the Li-X while maintaining some degree of the advantageous isotherm linearity that is seen with Li-X. Noting the high isosteric heat of adsorption for N2 on Ag-X zeolites combined with a relatively slow desorption of N2 on the same, the author proposed some degree of 9PDF Image | PSA USING SUPERIOR ADSORBENTS
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