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Chemical Fixation of CO2 Into Cyclic Carbonates via Porous Hyper-Crosslinked Polymers Containing Salen(Zn) and Multi-Ionic Sites
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DOI：10.1002/ajoc.70484.png)
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Abstract
En 中文
The integration of CO2 capture and conversion into a single heterogeneous catalyst represents a pivotal step toward sustainable carbon resource utilization. Herein, we report a facile synthesis of porous hyper-crosslinked polymers (Salen(Zn)-iHCP) containing salen(Zn) complex and multi-ionic sites via a one-pot Friedel–Crafts alkylation and quaternization strategy. This strategy elegantly overcomes the porosity limitations typically encountered during direct polymerization of charged ionic monomers. The resulting Salen(Zn)-iHCP features a high specific surface area, good CO2-selective affinity, and a uniform distribution of proximal Lewis acidic Zn(II) centers and nucleophilic Br− sites. Owing to the synergistic effect between the Zn and Br− sites, coupled with a good CO2 adsorption capacity, Salen(Zn)-iHCP exhibits high catalytic activity for the cycloaddition of CO2 with various epoxides in the absence of any additives and solvents. At 100°C and 1.0 MPa, Salen(Zn)-iHCP2 achieves 99% conversion of epichlorohydrin with 97% yield of corresponding cyclic carbonate. Notably, Salen(Zn)-iHCP2 maintains high activity even using simulated flue gas (15% CO2 in 85% N2) as the carbon source and demonstrates robust recyclability over five cycles. This work provides a promising strategy for constructing high‑performance heterogeneous catalysts for integrated CO2 capture and conversion.
Keywords:
carbon dioxide
cyclic carbonate
hyper-crosslinked polymers
salen complex
synergistic effect
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