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Peer-reviewedCC BY-NC-ND 4.0ACS Omega

Modular Solvent-Free Carbon Removal: A Solid–Sorbent Reactor for Sequential Direct Air Capture and Flue Gas Decarbonization

  • Jung Sug Hong1
  • Hyunji Yu1
  • Jun Ho Jang1
  • Young In Jo1
  • Moo Young Lee1
  • Jeonghyun Kim1
  • Sunghak Park2,3
  • Ki Tae Nam1
  1. 1Seoul National University , , ,
  2. 2Sungkyunkwan University (SKKU) , , ,
  3. 3Sungkyunkwan University , , ,
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Abstract

Scaling carbon removal to gigatonne-per-year levels requires capture technologies that are simultaneously efficient, environmentally clean, and deployable across heterogeneous emission sources, from dilute atmospheric CO2 (∼420 ppm) to concentrated industrial flue gas (1–33 vol %). Established amine- and hydroxide-based systems typically employ circulating liquid capture media and cyclic regeneration, making solvent handling, regeneration energy, and capture-medium degradation central to process complexity and economics. Here, an alternative solvent-free carbon capture process is demonstrated that addresses both source types within a single sequential platform. A composite sodium hydroxide–sodium percarbonate sorbent captures ambient CO2 via humidity-activated sodium peroxide (Na2O2) formation, fully converting NaOH to Na2CO3 with a capacity of 0.545 gCO2 gNaOH–1. The resulting carbonate is subsequently converted to bicarbonate under 15 vol % CO2 through water-mediated trona-phase growth, and is stacked in a modular reactor to achieve complete sequential capture at 0.612 gCO2 gsorbent–1. The end product, sodium bicarbonate, may be stored or used as feedstock for downstream electrochemical and chemical syntheses, offering a complementary solvent-free pathway for sequential carbon capture.

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Cite

BibTeXRIS
BibTeX
@article{hong2026modular,
  title = {{Modular Solvent-Free Carbon Removal: A Solid–Sorbent Reactor for Sequential Direct Air Capture and Flue Gas Decarbonization}},
  author = {Jung Sug Hong and Hyunji Yu and Jun Ho Jang and Young In Jo and Moo Young Lee and Jeonghyun Kim and Sunghak Park and Ki Tae Nam},
  journal = {ACS Omega},
  year = {2026},
  month = oct,
  doi = {10.1021/acsomega.6c07660},
  url = {https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c07660/5455685/Modular-Solvent-Free-Carbon-Removal-A-Solid},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - JOUR
TI  - Modular Solvent-Free Carbon Removal: A Solid–Sorbent Reactor for Sequential Direct Air Capture and Flue Gas Decarbonization
AU  - Jung Sug Hong
AU  - Hyunji Yu
AU  - Jun Ho Jang
AU  - Young In Jo
AU  - Moo Young Lee
AU  - Jeonghyun Kim
AU  - Sunghak Park
AU  - Ki Tae Nam
PY  - 2026
DA  - 2026/10/21
JO  - ACS Omega
DO  - 10.1021/acsomega.6c07660
UR  - https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c07660/5455685/Modular-Solvent-Free-Carbon-Removal-A-Solid
AB  - Scaling carbon removal to gigatonne-per-year levels requires capture technologies that are simultaneously efficient, environmentally clean, and deployable across heterogeneous emission sources, from dilute atmospheric CO2 (∼420 ppm) to concentrated industrial flue gas (1–33 vol %). Established amine- and hydroxide-based systems typically employ circulating liquid capture media and cyclic regeneration, making solvent handling, regeneration energy, and capture-medium degradation central to process complexity and economics. Here, an alternative solvent-free carbon capture process is demonstrated that addresses both source types within a single sequential platform. A composite sodium hydroxide–sodium percarbonate sorbent captures ambient CO2 via humidity-activated sodium peroxide (Na2O2) formation, fully converting NaOH to Na2CO3 with a capacity of 0.545 gCO2 gNaOH–1. The resulting carbonate is subsequently converted to bicarbonate under 15 vol % CO2 through water-mediated trona-phase growth, and is stacked in a modular reactor to achieve complete sequential capture at 0.612 gCO2 gsorbent–1. The end product, sodium bicarbonate, may be stored or used as feedstock for downstream electrochemical and chemical syntheses, offering a complementary solvent-free pathway for sequential carbon capture.
SN  - 2470-1343
ER  -