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(99.998% prepurified) were obtained from Cryogenic Gases. Deionized water was used for all ion-exchanges and for all washings. Preparation of Li-LSX. The lithium zeolites were prepared by 5 consecutive static ion-exchanges using a 6.3-fold excess (over that necessary for full ion-exchange) of a 2.2 M solution of LiCl. This was done in a 0.01 M solution of LiOH at a pH 9. The lithium ion-exchange solution was heated to a mild boil and then allowed to cool and settle. The solution was decanted, a fresh 6.3X LiCl solution was added, and the procedure was repeated for a total of 5 exchanges. After the final ion-exchange, the material was vacuum filtered and washed with copious amounts of deionized water until no free ions were present in the filter water (i.e., no AgCl precipitation upon treatment with Ag+). The resulting lithium exchanged zeolites were dried overnight at room temperature before being dehydrated in vacuo prior to measurement of adsorption isotherms. Characterization. The composition of Li-LSX samples which had been synthesized using the prescribed procedure (given above) were characterized previously using neutron activation analysis (NAA) and inductively coupled plasma mass spectrometry (ICP-MS).20 The samples were found to be nearly fully Li+ exchanged, containing, on average, less than one Na+ per unit cell. The adsorption isotherms were measured using a static volumetric system (Micromeritics ASAP-2010). Additions of the analysis gas were made at volumes required to achieve a targeted set of pressures. A minimum equilibrium interval of 9 seconds with a tolerance of 5% of the target pressure (or 0.007 atm, whichever is smaller) was used to determine equilibrium for each measurement point. The pressure transducers 132PDF Image | PSA USING SUPERIOR ADSORBENTS
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