Development of oxygen selective adsorbents for gas separation and purification

Abstract

Development, characterization, and testing of oxygen selective chemical adsorbents (chemisorbents) for cyclic gas separation and purification applications using pressure cycling are described herein. Three structurally related compositions, designated IA-1, IA-2, and IA-3 offer high oxygen capacities and selectivities coupled with fast uptake kinetics. Extended lifetime tests for IA-3 indicate a half-life of 17 years with 0.01 % oxygen at 60 °F under cycling conditions. Hazard testing results are presented and these data impose some restrictions on handling and use. For practical applications using packed beds of adsorbent in pressure-swing cycles, agglomeration is required to produce larger particles using formulations and methods that minimize the impact on oxygen binding. Methods are described herein using polymeric binders that provide the necessary physical features while maintaining adequate adsorption performance characteristics. Proof of concept oxygen removal test results are also described.