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site II location. Vacuum dehydration at 450 C induced thermal migration of Ag+ from site II to site II* and gives rise to the superior properties for air separation. The effects of residual water on adsorption properties are studied. Li-LSX zeolite (Si/Al = 1.0) is chosen because it is currently the best sorbent in industrial use for air separation. In this present work we have synthesized fully exchanged Li-LSX zeolite and measured the room temperature equilibrium adsorption isotherms for N2, O2 and Ar after various degrees of dehydration. The effect of the residual water on the adsorption of theseatmosphericgaseswasthensimulatedusingMonteCarlotechniques. Verysmall amounts of water in the Li-LSX zeolite have a significant effect on the adsorptive capacity of these atmospheric gases with the capacity for N2 dropping from approximately 17.4 molecules N2 adsorbed per unit cell for the fully dehydrated material to less than 2 molecules adsorbed per unit cell when the sample contained 32 residual water molecules per unit cell, an indication that the N2 molecules only interact with the supercage SIII Li+ cations. In Chapter 5, we describe the syntheses and adsorption properties of oxygen selective sorbents. We have measured O2 and N2 adsorption and desorption isotherms for Co(salen), and Co(fluomine), and for Co(fluomine) immobilized on LSX zeolite, on MCM-41, and on ion-exchange resin. The immobilized samples were prepared by first ion exchange with Co2+, followed by attachment of fluomine ligand. Attempts to increase the stability by attaching the cobalt center of Co(fluomine) complex were not successful. However, we were able to improve the characteristics of the binding isotherm to make the oxygenation significantly more reversible, as well as to obtain a possible slope for the binding isotherm, both were desirable for applications. The Co(fluomine)-MCM-41 190PDF Image | PSA USING SUPERIOR ADSORBENTS
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