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Introduction Nitrogen and oxygen are two of the most abundantly produced chemicals in the world. These gases are produced by a number of processes, but, predominately by separation of air using cryogenic distillation. However, as adsorption systems have become more efficient and better sorbents have been developed, industrial production of nitrogen and oxygen by adsorption has become an increasingly important alternative technology. 1 Commercial sorption-based air separation is normally conducted by the use of nitrogen-selective zeolites in pressure swing adsorption (PSA) systems. However, separation of air by adsorption of its less abundant component (O2) is certainly more desirable; and researchers have searched, for some time, for a material that adsorbs oxygen preferentially to nitrogen for use in industrial adsorption systems. Carbon molecular sieves (CMS) can be used as an oxygen-selective material for kinetic separation of air in a PSA system. However, even the most effective CMS materials have poor O2/N2 selectivity and are usually used for production of enriched oxygen or nitrogen rather than for the production of very high purity gases.2 Since the 1940s, considerable work has been devoted to the study of oxygen-binding transition metal complexes, mostly in attempts to model important biological oxygen carriers such as hemoglobin and myoglobin. Because of their similarity to the natural heme proteins, O2-binding iron complexes have received the most attention; but, it is the oxygen carrying complexes of cobalt that have proven the most promising as potential oxygen sorbents for air separation. Several thorough reviews are available on this subject.2-4 155PDF Image | PSA USING SUPERIOR ADSORBENTS
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