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ChemComm
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COMMUNICATION
Journal Name
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separation of CO and N2 (see the comparison in ESI, Table
S4).16a,16c-16e
In summary, we developed an efficient method for the high
efficient and reversible capture of CO. During the absorption of
CO in the PCILs at elevated pressures, a phase change from
liquid to solid happens. As a result, up to 0.96 molCO/molIL
absorption capacity was obtained, which is at least 150 times
higher than that in the well-known [BMIM][PF6] IL. 11b The CO
releases from the PCILs can be well controlled by pressure
swing, temperature swing, stirring, solvent addition, or
microwave radiation (releasing time: 1 to 3000 mins). These
new PCILs can be easily reused without obvious loss of
absorption and desorption efficiency. Compared to the well
known COSORB absorbent, PCILs possess the advantage of low
viscosity, large absorption capacity and organic solvent-free. In
addition, these new PCILs show also great potential in the
selective membrane separation of CO from N2 that may offer a
better alternative to the current methods.
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Acknowledgement
This work was supported by National Natural Science
Foundation of China (No.21576129, 21676134, and 21878141).
Conflicts of interest
We have no conflicts of interest to declare.
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