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Volume 183, 2015
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Highly optimized CO2 capture by inexpensive nanoporous covalent organic polymers and their amine composites

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Abstract

Carbon dioxide (CO2) storage and utilization requires effective capture strategies that limit energy penalties. Polyethylenimine (PEI)-impregnated covalent organic polymers (COPs) with a high CO2 adsorption capacity are successfully prepared in this study. A low cost COP with a high specific surface area is suitable for PEI loading to achieve high CO2 adsorption, and the optimal PEI loading is 36 wt%. Though the adsorbed amount of CO2 on amine impregnated COPs slightly decreased with increasing adsorption temperature, CO2/N2 selectivity is significantly improved at higher temperatures. The adsorption of CO2 on the sorbent is very fast, and a sorption equilibrium (10% wt) was achieved within 5 min at 313 K under the flow of simulated flue gas streams. The CO2 capture efficiency of this sorbent is not affected under repetitive adsorption–desorption cycles. The highest CO2 capture capacity of 75 mg g−1 at 0.15 bar is achieved under dry CO2 capture however it is enhanced to 100 mg g−1 in the mixed gas flow containing humid 15% CO2. Sorbents were found to be thermally stable up to at least 200 °C. TGA and FTIR studies confirmed the loading of PEIs on COPs. This sorbent with high and fast CO2 sorption exhibits a very promising application in direct CO2 capture from flue gas.

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Publication details

The article was received on 30 May 2015, accepted on 16 Jun 2015 and first published on 17 Jun 2015


Article type: Paper
DOI: 10.1039/C5FD00099H
Citation: Faraday Discuss., 2015,183, 401-412
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    Highly optimized CO2 capture by inexpensive nanoporous covalent organic polymers and their amine composites

    H. A. Patel and C. T. Yavuz, Faraday Discuss., 2015, 183, 401
    DOI: 10.1039/C5FD00099H

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