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Adsorption Isotherms 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 in the ASAP-2010 are accurate to <0.2% for the pressure range of 0-1 atm. The sample weights were obtained using a digital laboratory balance that is accurate to ± 0.01 g. The isotherm measurements and the samples themselves were found to be highly reproducible. Helium (99.995%, prepurified), oxygen (99.6%, extra dry), nitrogen (99.998%, prepurified), and argon (99.998% prepurified) were obtained from Cryogenic Gases. Adsorption isotherms are often reported as the amount (in mmol or vol-stp) of gas adsorbed per mass (in gram) of dehydrated sorbent. However, since there is a considerable change in the density of the resultant zeolite with the ion-exchange of low mass lithium cations for the much heavier silver cations, it is more meaningful to present adsorption data as the molecules of adsorbate in each unit cell of the sorbent Li,Ag- zeolite. Conversion factors for this conversion are given for each of the samples in Table 11. Figure 4 shows the N2, O2 and Ar adsorption isotherms, measured at 25 C, for Li94.5Na1.5-LSX after vacuum dehydration at 350 C. This zeolite is used in adsorptive air separation because of its very high N2 capacity and very favorable N2:O2 selectivity (approximately 6:1 at 1 atm) as well as its N2 isotherm linearity. Figure 5 shows the 97PDF Image | PSA USING SUPERIOR ADSORBENTS
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