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d ln P ∆ H a d s = R d ( 1 T ) Using the data from adsorption isotherms measured at 50 C, 25 C, and 0 C, the isosteric heats of adsorption for N2 on Ag-LSX (which had been vacuum dehydrated at 450 C) and Li-LSX (Li+ ion-exchanged LSX zeolite) were determined by evaluating the slope of a plot of ln(P) versus (1/T) at several coverages and are shown in Figure 8. This plot shows that for N2 on Ag-LSX-450 there is a high initial heat of adsorption which initially drops quickly the gradually to become nearly horizontal at high adsorbate coverage. This energetic heterogeneity indicates the presence of local intra-crystalline positions where the adsorbate is preferentially adsorbed more exothermally than in the rest of the intra-crystalline volume. For comparison, the heat of adsorption for N2 on Li- LSX was also included. This is a very energetically homogeneous adsorptive surface with Li in SII having no interaction with the N2 gas. Only Li in the SIII interact with the N2.8,31 References (1) Barrer, R. M., Zeolites and Clay Minerals as Sorbents and Molecular Sieves, Academic Press: London, 1978. (2) Breck, D. W., Zeolite Molecular Sieves, R. E. Krieger Publishing: Malabar, FL, 1984. (3) Kuhl, G.H. Zeolites. 1987, 7, 451. (4) Habgood, H. W. Can. J. Chem. 1964, 42, 2340. (5) Huang, Y. J. Catalysis 1974, 32, 482. ( 6 ) n 30PDF Image | PSA USING SUPERIOR ADSORBENTS
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