Is N-Doping in Porous Carbons Beneficial for CO 2 Storage? Experimental Demonstration of the Relative Effects of Pore Size and N-Doping
Open accessAbstract
The relative influence of nitrogen doping and pore size of highly microporous carbon materials, with virtually identical porosity, on CO 2 uptake capacity at low pressure (≤1 bar) is presented in this article. The carbon materials are prepared via a range of synthesis methods, including activation of a variety of carbon precursors (biomass, polypyrrole, or carbon nanotube superstructures) and carbonization of an organic salt (potassium hydrogen phthalate), which generated a series of carbons with closely matched porosity but which are either N-free or N-doped. The carbons have a total surface area of 920 ± 60 m 2 /g and micropore surface area of 860 ± 40 m 2 /g, values that are within ±5% of each other and within the repeatability range (or experimental error) of the porosity measurements. The carbons have identical micropore volume of 0.39–0.40 cm 3 /g, and similar overall pore size and apparent pore size distribution. The similar porosity values allowed a simple and straightforward analysis of the influence of N-doping on CO 2 uptake without any ambiguities associated with changes in surface area and pore volume. Contrary to many previous reports wherein both N-doping and porosity varied, we show that the presence of N has no beneficial effect on the adsorption of CO 2 . Rather, we show that the low-pressure adsorption of CO 2 on carbons is critically sensitive to the pore size, and in particular to minute changes in micropore size distribution within the pore size range 5–10 Å. The pore size also exerts greater influence on both the isosteric heat of CO 2 adsorption and the selectivity for CO 2 over N 2 .
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DAC conditions essentially occur at room temperature and pressure, under which micropore volume plays a crucial role in adsorption efficiency.
“Notably, the conditions of DAC essentially occur at room temperature and pres sure, under which the micropore volume plays a crucial role in the adsorption efficiency [41].”
From Direct air capture of CO2 by KOH-activated bamboo biochar (2022) · cites this paper as [41]
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- Authors
- Adeniran, B., & Mokaya, R.
- Affiliations
- University of Nottingham (GB)
- Corresponding author
- Mokaya, Robert
- ORCID
- Mokaya, Robert
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-01-19
- Volume
- 28
- Issue
- 3
- Pages
- 994-1001
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W2223750255
- Cited by
- 142
- References
- 64
- Citations by year
- 2026: 10 · 2025: 12 · 2024: 8 · 2023: 14 · 2022: 17 · 2021: 8 · 2020: 15 · 2019: 17 · 2018: 17 · 2017: 14 · 2016: 10
- FWCI
- 17.19
- Type
- journal article
- Language
- en
- Open access
- Licence
- other-oa
- Locations
- Chemistry of Materials (publishedVersion)
- Repository@Nottingham (University of Nottingham) (acceptedVersion, other-oa)
- Repository@Nottingham (University of Nottingham) (submittedVersion, cc-by)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Physical Sciences › Chemistry › Spectroscopy › Adsorption, diffusion, and thermodynamic properties of materials
- Keywords
- nitrogen-doped carbon, porous carbon, CO2 adsorption, CO2 sequestration, pore size distribution, micropores, low-pressure adsorption, isosteric heat of adsorption, CO2/N2 selectivity, carbon activation, biomass-derived carbon
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