Abstract
Sorbent stability poses significant impacts on long-term performance of direct air capture (DAC) of CO2 and levelized cost of capture (LCOC). We report the DAC performance degradation of amine-infused fiber sorbents based on poly(ethylenimine) (PEI), mesoporous SiO2, and cellulose acetate (CA) over CO2 cyclic sorption cycles in a nonoxidative environment. Infrared and nuclear magnetic resonance spectra indicate that the aminolysis reactions between CA ester moieties and PEI amine sites lead to the formation of acetamides and hence lower CO2 affinities of the sorbents. This stability issue can be remedied by hydrolysis treatment of the CA fiber sorbents before PEI impregnation or replacing CA with poly(ether sulfone). This study underscores the importance of selecting proper support or additive materials of DAC contactors that are compatible with active species of CO2 capture.
| Original language | English |
|---|---|
| Pages (from-to) | 13512-13518 |
| Number of pages | 7 |
| Journal | Industrial and Engineering Chemistry Research |
| Volume | 64 |
| Issue number | 26 |
| DOIs | |
| State | Published - Jul 2 2025 |
Funding
This research was supported by the U.S. Department of Energy, Office of Fossil Energy and Carbon Management under award no. DE-FE0032129. This work was performed in part at the Georgia Tech Institute for Electronics and Nanotechnology, a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the National Science Foundation (ECCS-2025462). The authors appreciate Dr. Johannes Leisen for his assistance with the solid-state NMR experiments.