PLSS Scale Demonstration of MTSA Temperature Swing Adsorption Bed Concept for CO ₂ Removal/Rejection

Metabolic heat regenerated temperature swing adsorption (MTSA) that is incorporated into a Portable Life Support System (PLSS) is being explored as a viable means of removing and rejecting carbon dioxide (CO₂) from an astronaut's ventilation loop. Sorbent pellets, which were used in previous work, are inherently difficult to heat and cool quickly. Further, their use in packed beds creates a large, undesirable pressure drop. Work has thus been done to assess the application and performance of aluminum foam that has been washcoated with a layer of sorbent. A to-scale sorbent bed, which is envisioned for use by a Martian PLSS, was designed, built, and tested. Performance of the assembly in regards to CO₂ adsorption and pressure drop was assessed, and the results are presented here.