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Sorption and Separation of CO₂ from Syngas by a Quaternary Ammonium-Based Poly(ionic liquid)
- Huang, Mengting, Cao, Jieying, Hong, Yanzhen, Su, Yuzhong, Wang, Hongtao, Li, Jun
- Industrial & engineering chemistry process design and development 2019 v.58 no.19 pp. 8317-8322
- X-ray diffraction, absorption, carbon dioxide, carbon monoxide, crystal structure, differential scanning calorimetry, freeze drying, ionic liquids, polymerization, synthesis gas
- Poly(ionic liquid)s (PILs) have received great attention recently for their potential applications in gas capture. In this work, a quaternization reaction and radical polymerization were applied to the synthesis of a quaternary ammonium-based PIL which was further characterized for its structure and properties. Interestingly, although X-ray diffraction showed an amorphous structure, differential scanning calorimetry evidenced that the PIL prepared by freeze-drying possessed low crystallinity compared to PILs prepared by other drying methods, which contributed to its high CO₂ absorption (236 mg/g) and good CO₂/CO selectivity (6.0) at 303.0 K and 5.0 MPa. To the best of our knowledge, this is the first CO₂/CO selectivity observed for PIL material. An absorption–desorption process by the PIL for CO₂ separation from syngas at 303.0 K and 5.0 MPa was investigated and revealed a complete separation of CO₂ from the syngas. Furthermore, a cyclic absorption experiment confirmed good regeneration of the PIL, suggesting that it could be a potential material to separate and recover CO₂ from syngas.