Accelerated Testing of PEI-Silica Sorbent Pellets for Direct Air Capture.

Amine-based sorbents have shown exceptional CO uptake for direct air capture (DAC). However, amine degradation is a major issue for this class of materials, hindering their deployment for large-scale DAC. In this study, a comprehensive evaluation of polyethylenimine (PEI) sorbents was conducted to understand their degradation under process-relevant environments for the DAC of CO.