Assessment of the Role of Micropore Size and N-Doping in CO 2 Capture by Porous Carbons
Open accessAbstract
The role of micropore size and N-doping in CO2 capture by microporous carbons has been investigated by analyzing the CO2 adsorption properties of two types of activated carbons with analogous textural properties: (a) N-free carbon microspheres and (b) N-doped carbon microspheres. Both materials exhibit a porosity made up exclusively of micropores ranging in size between <0.6 nm in the case of the pristine materials and up to 1.6 nm for the highly activated carbons (47% burnoff). The N-doped carbons possess ~3 wt % of N heteroatoms that are incorporated into several types of functional groups (i.e., pyrrole/pyridone, pyridine, quaternary, and pyridine-N-oxide). Under conventional operation conditions (i.e., T ~ 0-25 °C and P(CO2) ~ 0-1 bar), CO2 adsorption proceeds via a volume-filling mechanism, the size limit for volume-filling being ~0.7-0.8 nm. Under these circumstances, the adsorption of CO2 by nonfunctionalized porous carbons is mainly determined by the volume of the micropores with a size below 0.8 nm. It was also observed that the CO2 capture capacities of undoped and N-doped carbons are analogous which shows that the nitrogen functionalities present in these N-doped samples do not influence CO2 adsorption. Taking into account the temperature invariance of the characteristic curve postulated by the Dubinin theory, we show that CO2 uptakes can be accurately predicted by using the adsorption data measured at just one temperature.
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“e developed porosity can be achieved through adjusting the activation conditions [24].”
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- Authors
- Sevilla, M., Parra, J. B., & Fuertes, A. B.
- Affiliations
- Instituto Nacional del Carbón (ES)
- Instituto Nacional del Carbón (CSIC), P.O. Box 73, Oviedo 33080, Spain
- Corresponding author
- Sevilla, Marta
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-06-24
- Volume
- 5
- Issue
- 13
- Pages
- 6360-6368
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W1976499791
- Cited by
- 410
- References
- 35
- Citations by year
- 2026: 28 · 2025: 34 · 2024: 31 · 2023: 30 · 2022: 37 · 2021: 26 · 2020: 36 · 2019: 27 · 2018: 39 · 2017: 31 · 2016: 37 · 2015: 34 · 2014: 18 · 2013: 2
- FWCI
- 40.24
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Licence
- other-oa
- Locations
- ACS Applied Materials & Interfaces (publishedVersion)
- PubMed (publishedVersion)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, other-oa)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Chemistry › Spectroscopy › Adsorption, diffusion, and thermodynamic properties of materials
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Keywords
- CO2 capture, CO2 adsorption, micropore size, nitrogen doping, porous carbon, activated carbon, carbon microspheres, pyridine N-oxides, pyridine, pyrrole, adsorption capacity prediction, temperature invariance
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