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must be dried. Differential thermal analysis (DTA) of zeolite X has shown a continuous loss of water over a broad range of temperatures, starting at slightly above room temperature up to 623 K with a maximum at about 573 K.4 Because of the near limitless zeolitic structural possibilities, it seems probable that a zeolite can be tailored for nearly any desired gas separation. Ideally, molecular simulation of the gas adsorption would provide a quick and cost effective evaluation of potential sorbents. And, indeed, several studies have been reported in which grand canonical Monte Carlo simulations have been used to predict gas adsorption in zeolites.11- 16 Razmus and Hall used Monte Carlo simulation to reproduce experimental single component adsorption isotherms for N2, O2 and Ar in 5A zeolite.17 Watanabe et al. used Monte Carlo methods to study the air separation properties of zeolite types A, X, and Y;18 and Richards et al. used computer simulation to study the gas separation properties specifically of Li-X zeolite.19 In this present work we have synthesized fully exchanged Li-LSX zeolite and measured the room temperature adsorption isotherms for N2, O2 and Ar after various degrees of dehydration. The effect of the residual water on the adsorption of these atmospheric gases was then simulated using Monte Carlo techniques. Experimental Details Materials. A binderless, fully hydrated K,Na-LSX zeolite (Si/Al =1, Praxair, #16193-42) was the starting material for these experiments. Helium (99.995%, prepurified), oxygen (99.6%, extra dry), nitrogen (99.998%, prepurified), and argon 131PDF Image | PSA USING SUPERIOR ADSORBENTS
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