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exchanged A and X zeolites with lithium and an alkaline earth metal (e.g., Ca2+, Sr2+). In this case the zeolite contained lithium and the alkaline earth cations in a mixture of 10% to 70% alkaline earth and 30% to 90% lithium. These mixed cation zeolites provided high adsorption capacity and high thermal stability. Fitch et al. (1995) reported good N2/O2 selectivity and N2 capacity with mixed LixAly-X zeolite (i.e., using Al3+ as the non- framework charge-compensating cation). Silver is also known to have very strong effects on the adsorption characteristics of zeolites (Habgood, 1964; Huang, 1974; Hutson et al., 2000). Yang et al. (1996) reported the synthesis of a mixed lithium-silver (80/20) ion-exchanged X-type zeolite (Si/Al 1.25 with approximately 17 Ag+ per unit cell), and discussed its potential use in air separation. This sorbent utilized the very strong adsorptive properties of the Ag+ ion that 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. Ab inito molecular orbital calculations showed the adsorption of nitrogen was enhanced by weak chemical interaction (through a classical π-complexation bond) with the Ag+ cation on the zeolite framework (Chen and Yang, 1996). Hutson et al. (1999) have reported the synthesis of mixed Li,Ag low-silica X-type zeolite in which the addition of very small amounts of silver and specific dehydration conditions resulted in enhanced adsorptive characteristics and increased energetic heterogeneity relative to those of the fully (or near-fully) exchanged Li+-zeolites. The performance for air separation by the best of these sorbents, containing, on average, only one Ag per unit cell, was compared to that of the fully (or near-fully) Li+-exchanged zeolite using a standard pressure swing adsorption (PSA) cycle by numerical simulation. 87PDF Image | PSA USING SUPERIOR ADSORBENTS
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