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The very high heat of binding of the N2 molecules at very low pressures is probably due to very high electrostatic fields near the exposed charged Ag-clusters and their interaction with the quadrupole moment of the N2 molecule. However, because there is also an increase in the adsorption of argon, which does not have a quadrupole moment, these charged clusters must also contribute to the total energy of physical adsorption by increased van der Waals and field-induced dipole energies and could possibly have a higher polarizing power than that of isolated silver cations. Physical adsorption, however, is likely not the only contribution to N2 adsorption in silver-containing zeolites. Yang et al, noting the high isosteric heat of adsorption for N2 on Ag86-X-1.25 zeolites combined with a relatively slow desorption of N2 on the same, proposed some degree of weak π-complexation.15 The π-complexation character of the interaction was subsequently confirmed by ab inito molecular orbital calculations using N2 and an Ag-X cluster model and was referred to as “weak chemisorption-assisted adsorption”.16 PSA Cycle Description. A standard five-step PSA cycle that is presently used in industry for air separation (Leavitt, 1991) was used in this study. The steps involved in each cycle are as follows: (step I) pressurization with the feed gas, namely, 22% O2 (mixture of O2 and Ar) and 78% N2; (step II) high pressure adsorption with the feed gas, or feed step; (step III) cocurrent depressurization; (step IV) countercurrent blowdown; and (step V) countercurrent low pressure purge with the product of the feed step (oxygen). All the above steps were of equal duration (30 seconds); thus the time required for the completion of each PSA cycle was 2.5 minutes. The model assumed only two 64PDF Image | PSA USING SUPERIOR ADSORBENTS
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