Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 283, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119620
Keywords
Multiple-site integration; CO2 capture; CO2 conversion; Atmospheric conditions; Cocatalyst-free
Funding
- National Natural Science Foundation of China [U1810125, 51776133, U1710110]
- Key R&D Program of Shanxi Province [201903D121031]
- Natural Science Foundation of Shanxi Province [201901D111082]
- Shanxi Scholarship Council of China
- Technology Innovation Project of Higher Education of Shanxi Province [201802054]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Research Chairs Program
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This study introduces a facile multiple-site integration strategy for capturing and converting low-concentration CO2 into cyclic carbonates under atmospheric conditions. By adjusting the type and content of multiple sites, the nucleophilicity, basicity and acidity can be flexibly modulated to optimize catalytic activity.
The capture of CO2 and subsequent conversion into high value-added chemicals under atmospheric conditions is an on-going challenge. This work reports a facile multiple-site integration strategy for the capture of low-concentration CO2 and subsequent cocatalyst/metal/solvent-free coupling with epoxides to synthesize cyclic carbonates under atmospheric conditions. Through the one-step integration of commonly-used imidazolium ionic liquids (ILs) and quaternary ammonium salt, porous polyILs with acidic/basic moieties (-NH2, -COOH), active cations (imidazolium, quaternary ammonium) and nucleophilic counterions (Br-, Cl-, OH-) have been fabricated. The cooperation of nucleophilicity, basicity and acidity, which is critical for the activation of CO2 and epoxides, has been flexibly modulated via regulating the type and content of the multiple-sites. The polyILs show good low concentration CO2 affinity, high catalytic activity under atmospheric conditions, efficient recyclability and excellent tolerance for a variety of epoxides, and the new strategy developed shows great potential for practical applications in low-energy fixation of CO2.
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