(248c) Design, Synthesis, and Applications of Reversible Oxygen Chemisorbents

Novel high-capacity oxygen selective adsorbents are described that bind oxygen reversibly at temperatures near ambient. The class of materials described employ a redox-active cobalt(II) site embedded within a coordination environment designed to ensure facile access to active sites. The specific compositions that will be presented are well-suited to trace oxygen removal from a variety of process streams. Oxygen capacities at saturation are in excess of 1.6 mmol/g and selectivity over nitrogen is very high. Regeneration is accomplished by pressure swing and this avoids the need for reducing atmospheres and elevated temperatures that are typically required for getter materials and deoxo processes. Extensive lifetime studies will be described that are parametric in temperature, oxygen partial pressure, and residual water content. Half-life for a typical example is over 4 years with 1% oxygen at 40F under cycling conditions.