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capacity.16 None of these materials has shown the necessary combination of reversibility, capacity and stability needed for use in industrial gas separations. Recent research efforts have focused on steric hindrance as a means of protecting the oxygen-binding complex from oxidation and dimerization. The most promising approach has been to prepare the oxygen sorbent by entrapment or encapsulation as a solid state metal complex within the cages of a synthetic zeolite.17-24 None of these efforts, however, proved effective for separating oxygen from nitrogen due to instabilities and/or inadequate O2-binding capacity. Although numerous transition metal complexes with oxygen-binding ability have been reported, none of these materials has achieved commercial success as a sorbent for air separation. All these materials have suffered from one or more of the following drawbacks that have prevented commercialization: (1) chemical instability, (2) unacceptable adsorption characteristics and/or (3) unacceptable cost. In this study we have synthesized complexes of known oxygen-binding ability (specifically Co(salen) and Co(fluomine)). We have also synthesized these materials using a modified synthesis technique that resulted in complexes that were attached (immobilized) to the surface of several porous substrates. The O2-binding capacity and the stability of these resulting sorbents were then characterized. The modified procedure involved two steps. The first step was to bond Co2+ on anion sites of a substrate, by ion exchange, to form a stable ionically bonded Co2+. This was followed by attaching ligands coordinatively to Co2+ that would give Co2+ the oxygen-binding ability. The details of this reasoning was given elsewhere.25 157PDF Image | PSA USING SUPERIOR ADSORBENTS
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