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Experimental Details The Co(salen) used in these studies was prepared using procedures similar to those previously provided by Bailes and Calvin.9 The Co(fluomine) was prepared using modifications of procedures provided by Bailes and Calvin and Adduci.9,12 The immobilized Co(salen) and Co(fluomine) sorbents were prepared using modifications of those procedures. Materials. Several substrates with cation exchange capacities were used in the course of this work. They were (1) a binderless, hydrated type-X zeolite powder with a Si/Al of 1.0 (sometimes referred to as LSX or low silica X-zeolite), (2) a mesoporous material, MCM-41 with Si/Al 5, and (3) a sulfonated polystyrene cation exchange resin (Rhom and Haas Amberlyst-15). MCM-41 is a mesoporous material from the M41S family discovered in 1992 by researchers at Mobil Corporation.26 These silicate/aluminosilicate mesoporous molecular sieves have pore structures that are nearly as regular as those in zeolites; but, they are considerably larger; and, depending upon the amount of tetrahedrally coordinated aluminum in the framework structure, may also posses cation exchange capacity.27 The unit cell of low silica X zeolite is (M+)96(SiO2)96(AlO2)96 while the unit cell of MCM-41 is (M+)16(SiO2)80(AlO2)16 (where M+ is the non-framework charge-compensating cation). Helium (99.995%, prepurified), oxygen (99.6%, extra dry), nitrogen (99.998%, prepurified), and argon (99.99%, prepurified) were obtained from Cryogenic Gases. Deionized water was used for all ion-exchanges and washings. Synthesis of Co(salen). For these studies, Co(salen) was prepared by dissolving 0.1 mol cobaltous acetate tetrahydrate (97%, ACROS Organics) in 250 mL boiling DI water 158PDF Image | PSA USING SUPERIOR ADSORBENTS
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