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the amount adsorbed. This would be an indication that there are some local intracrystalline positions where the guest molecules are preferentially sorbed more exothermally than in the rest of the intracrystalline volume. At intermediate uptakes, the slope of this plot will usually decrease and become nearly constant. The measurement of adsorption isotherms at different temperatures permits the calculation of the heat of adsorption as a function of surface coverage. When experimental data are reported as a set of adsorption isotherms for a particular gas- adsorbent system, the isosteric heat of adsorption is usually calculated.25 The isosteric heat of adsorption can be calculated from a series of isotherms by application of the Clausius-Claperyron equation as follows: d ln P ∆ H a d s = R d ( 1 T ) Using the data from nitrogen and oxygen adsorption isotherms measured at 50 C, 25 C, and 0 C, the isosteric heats of adsorption were determined by evaluating the slope of a plot of ln(P) versus (1/T) at several coverages. The plots of ln(PN2) versus (1/T) at several coverages for Li94.5Na1.5-X-1.0 (top) and Li94.2Na0.7Ag1.1-X-1.0 (bottom) are shown in Figure 6. The isosteric heats of adsorption at different coverages were calculated for each of these materials (and for the fully exchanged Ag-X-1.0) and are shown in Figure 7. A similar analysis was also done for the oxygen and argon data, but these results are not shown. From the plots of the heats of nitrogen adsorption, shown in Figure 7, one can see that the isosteric heat of adsorption for N2 on Li94.2Na0.7Ag1.1-X-1.0 is quite high ( 8 kcal/mol) at low coverages, but immediately drops sharply to become nearly horizontal. This indicates the presence of local intracrystalline sites where the N2 is preferentially sorbed more strongly than at other sites within the intracrystalline (3) n 60PDF Image | PSA USING SUPERIOR ADSORBENTS
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