Superior Capture of CO2 Achieved by Introducing Extra-framework Cations into N-doped Microporous Carbon
Abstract
We designed and prepared a novel microporous carbon material (KNC-A-K) for selective CO 2 capture. The combination of a high N-doping concentration (>10 wt %) and extra-framework cations, which were introduced into carbonaceous sorbents for the first time, endowed KNC-A-K with exceptional CO 2 adsorption capabilities, especially at low pressures. Specifically, KNC-A-K exhibited CO 2 uptake of 1.62 mmol g –1 at 25 °C and 0.1 bar, far exceeding the CO 2 adsorption capability of most reported carbon material to date. Single component adsorption isotherms indicated that its CO 2 /N 2 selectivity was 48, which also significantly surpasses the selectivity of conventional carbon materials. Furthermore, breakthrough experiments were conducted to evaluate the CO 2 separation capability of KNC-A-K on CO 2 /N 2 (10:90 v/v) mixtures under kinetic flow conditions, and the obtained CO 2 /N 2 selectivity was as high as 44, comparable to that predicted from equilibrium adsorption data. Upon facile regeneration, KNC-A-K showed constant CO 2 adsorption capacity and selectivity during multiple mixed-gas separation cycles. Its outstanding low-pressure CO 2 adsorption ability makes KNC-A-K a promising candidate for selective CO 2 capture from flue gas. Theoretical calculations indicated that K + ions play a key role in promoting CO 2 adsorption via electrostatic interactions. In addition, we found that HCl molecules anchored in N-doped carbon have a similar promotion effect on CO 2 adsorption, which contradicts the conventional wisdom that the neutralization of basic sites by acids diminishes the adsorption of acidic CO 2 gas.
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The interactions between carbon surface and CO2 molecules are associated with formation of Lewis basic sites and hydrogen-bonding.
“The interactions are associated with the formation of the Lewis basic sites and the hydrogen-bonding between carbon surface and CO2 molecules [26, 27].”
From Preparation of Microporous Carbon from <i>Sargassum horneri</i> by Hydrothermal Carbonization and KOH Activation for CO<sub>2</sub> Capture (2018) · cites this paper as [26]
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“*e interactions are associated with the formation of the Lewis basic sites and the hydrogen-bonding between carbon surface and CO2 molecules [26, 27].”
Background
- Authors
- Zhao, Y., Liu, X., Yao, K. X., Zhao, L., & Han, Y.
- Affiliations
- Soochow University (CN)
- Dalian University of Technology (CN)
- King Abdullah University of Science and Technology (SA)
- Corresponding author
- Han, Yu
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-12-03
- Volume
- 24
- Issue
- 24
- Pages
- 4725-4734
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W2331279123
- Cited by
- 221
- References
- 65
- Citations by year
- 2026: 3 · 2025: 11 · 2024: 4 · 2023: 15 · 2022: 17 · 2021: 14 · 2020: 17 · 2019: 22 · 2018: 22 · 2017: 22 · 2016: 23 · 2015: 14 · 2014: 25 · 2013: 12
- FWCI
- 24.95
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Chemistry of Materials (publishedVersion)
- King Abdullah University of Science and Technology Repository (King Abdullah University of Science and Technology) (submittedVersion)
- Funders
- King Abdullah University of Science and Technology
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Organic Frameworks: Synthesis and Applications
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Keywords
- CO2 capture, extra-framework cations, potassium ions, CO2 adsorption, CO2/N2 selectivity, low-pressure adsorption, flue gas, adsorbent regeneration, electrostatic interactions, basic sites, breakthrough experiments
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