Microporous carbon foams: The effect of nitrogen-doping on CO2 capture and separation via pressure swing adsorption

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F23%3A00573807" target="_blank" >RIV/67985891:_____/23:00573807 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.cej.2023.144524" target="_blank" >https://doi.org/10.1016/j.cej.2023.144524</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cej.2023.144524" target="_blank" >10.1016/j.cej.2023.144524</a>

Result language

angličtina

Original language name

Microporous carbon foams: The effect of nitrogen-doping on CO2 capture and separation via pressure swing adsorption

Original language description

This work investigates the effect of nitrogen doping on the porous structure and CO2 adsorption properties of hierarchically porous carbon foams, at different temperatures and pressures. A series of carbon foams with nitrogen contents of ∼7 to 13 at % is prepared by reaction of sodium ethoxide with different amino alcohols (namely monoethanolamine, diethanolamine, and triethanolamine), followed by thermal decomposition of the reaction product. The structure, morphology, porosity and chemical composition are studied using appropriate methods. The resulting material comprises micron-scale macropores combined with unrestricted micropores and mesopores embedded in the carbon walls. It is found that both nitrogen species and ultra-micropores contribute positively to CO2 uptake. The carbon foam with a nitrogen content of ∼7 at % (as well as an ultra-micropore volume of 0.44 cm3 g−1 and a specific surface area of 1549 m2 g-1) displays the highest CO2 uptake, adsorbing 5.14 mmol g−1 at 273 K, 3.22 mmol g−1 at 298 K, or 1.93 mmol g−1 at 323 K. This nitrogen-doped carbon foam adsorbs more CO2 than the undoped carbon foam reference, despite having significantly lower ultra-micropore volume and higher specific surface area. This highlights the importance of nitrogen species in CO2 capture. However, increasing the nitrogen content leads to suppression of the micropore volume, resulting in poor CO2 uptake. High CO2/N2 selectivity with good separation of CO2 from the CO2-N2 gas mixture, fast adsorption via physisorption, and excellent cycling durability are also observed, pointing towards the high regenerative ability of these materials.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Chemical Engineering Journal

ISSN

1385-8947

e-ISSN

1873-3212

Volume of the periodical

471

Issue of the periodical within the volume

1 SEP

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

14

Pages from-to

144524

UT code for WoS article

001031834200001

EID of the result in the Scopus database

2-s2.0-85164258245