Cited by 410Carbon Dioxide Capture TechnologiesAdsorption, diffusion, and thermodynamic properties of materialsCO2 Sequestration and Geologic Interactions

Assessment of the Role of Micropore Size and N-Doping in CO 2 Capture by Porous Carbons

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Sevilla, Marta, Parra, Jose B., Fuertes, Antonio B.·2013·ACS Applied Materials & Interfaces

Abstract

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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Crossref · 10.1021/am401423b

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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
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
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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