Hierarchical porous carbon beads for selective CO2 capture

Su Yeong Jung, Jae Rang Lee, Yooseob Won, Dong Ho Lee, Young Cheol Park, Youn Sang Bae, Hyunuk Kim

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3 Citations (Scopus)


Excessive CO2 emissions from increased energy consumption are causing an environmental disaster that threatens humanity. Herein, we report the development of hierarchical porous carbon beads with interconnected micro- and mesopores for selective CO2 capture. Hierarchical porous carbon beads were prepared by the carbonization of potassium-exchanged phenol formaldehyde resin (PFR) beads obtained from exchange of K+ to the PFR OH groups. Interestingly, the carbonized K2CO3-treated PFR (CPFRs) exhibited notably high surface areas and total pore volumes with interconnected micro- and mesopores. Based on their high porosities and nitrogen contents, the K2CO3-treated CPFR beads adsorbed 7.80 wt% CO2 at 0.15 bar and 298 K, which is an adsorption result that is much higher than those (4.41 wt% and 5.33 wt%) of pristine and KOH-treated CPFR beads, respectively. More importantly, the ideal CO2/N2 selectivity (52.6) of K2CO3-treated CPFR beads, as determined by Henry's constant at room temperature, is superior to those (24.2 and 28.6) of pristine and KOH-treated CPFR beads, respectively. Breakthrough experiments with 15 % CO2 in N2, which has a similar partial pressure to the CO2 partial pressure in flue gases from coal power plants, revealed that K2CO3-treated CPFR beads selectively adsorb 5.5 wt% of CO2 over N2. This selective CO2 capacity is superior to those reported in other porous carbon materials. Therefore, to reduce CO2 emissions, hierarchical porous carbon beads with interconnected micro- and mesopores can play an important role in CO2 capture and separation.

Original languageEnglish
Article number101659
JournalJournal of CO2 Utilization
Publication statusPublished - 2021 Sept

Bibliographical note

Funding Information:
This study was conducted within the framework of the Research and Development Program of the Korea Institute of Energy Research (KIER) ( C1-2436 & C1-2439-01 ). It was also supported by the Center for Advanced Meta-Materials (CAMM) , which is funded by the Korean Ministry of Science and ICT (MSIT) as a Global Frontier Program ( 2019M3A6B3030636 ).

Publisher Copyright:
© 2021

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Process Chemistry and Technology


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