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High yield and high packing density porous carbon for unprecedented CO2 capture from the first attempt at activation of air-carbonized biomass

Haffner-Staton, Ephraim; Balahmar, Norah; Mokaya, Robert

High yield and high packing density porous carbon for unprecedented CO2 capture from the first attempt at activation of air-carbonized biomass Thumbnail


Authors

Ephraim Haffner-Staton

Norah Balahmar

Robert Mokaya



Abstract

The first attempt at activation of air-carbonized carbon reveals unusual resistance to activation and unprecedentedly high yields (32–80 wt%) of high packing density (0.7–1.14 g cm−3) microporous carbon dominated by 5.5–7 Å pores, which are just right for CO2 uptake (up to 5.0 mmol g−1) at 1 bar and 25 °C. The high gravimetric uptake and packing density offer exceptional volumetric storage, and unprecedented performance for low pressure swing adsorption (PSA) with working capacity of 6–9 mmol g−1 for a pure CO2 stream (6 to 1 bar) and 3–4 mmol g−1 for flue gas (1.2 to 0.2 bar). The working capacity for vacuum swing adsorption (VSA) is attractive at 5.0–5.4 mmol g−1 under pure CO2 (1.5 to 0.05 bar), and 1.8–2.2 mmol g−1 for flue gas (0.3 to 0.01 bar). The pure CO2 volumetric working capacity breaks new ground at 246–309 g l−1 (PSA) and 179–233 g l−1 (VSA). For flue gas conditions, the working capacity is 120 to 160 g l−1 (PSA). The performance of the activated air-carbonized carbons is higher than the best carbons and benchmark zeolites or MOFs.

Citation

Haffner-Staton, E., Balahmar, N., & Mokaya, R. (2016). High yield and high packing density porous carbon for unprecedented CO2 capture from the first attempt at activation of air-carbonized biomass. Journal of Materials Chemistry A, 4(34), 13324-13335. https://doi.org/10.1039/C6TA06407H

Journal Article Type Article
Acceptance Date Aug 2, 2016
Online Publication Date Aug 4, 2016
Publication Date Sep 14, 2016
Deposit Date Jul 3, 2017
Publicly Available Date Jul 3, 2017
Journal Journal of Materials Chemistry A
Print ISSN 2050-7488
Electronic ISSN 2050-7496
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 4
Issue 34
Pages 13324-13335
DOI https://doi.org/10.1039/C6TA06407H
Public URL https://nottingham-repository.worktribe.com/output/806596
Publisher URL http://pubs.rsc.org/en/content/articlelanding/2016/ta/c6ta06407h#!divAbstract
Contract Date Jul 3, 2017

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