Issue 4, 2008
From the journal:

Energy & Environmental Science

Organic liquid CO2 capture agents with high gravimetric CO2 capacity

David J. Heldebrant,*a   Clement R. Yonker,b   Philip G. Jessopc  and  Lam Phanc  

* Corresponding authors

a Pacific Northwest National Laboratory, Materials Chemistry and Surface Research Group, Energy and Efficiency Division, Richland, USA
E-mail: david.heldebrant@pnl.gov
Fax: +1-509-375-2186
Tel: +1-509-372-6359

b Pacific Northwest National Laboratory, Molecular Interactions & Transformations Group, Fundamental and Computational Sciences Directorate, Richland, USA
E-mail: clem.yonker@pnl.gov
Fax: +1-509-376-6660
Tel: +1-509-372-4748

c Queens University, Department of Chemistry, 90 Bader Lane, Kingston, ON, Canada
E-mail: jessop@chem.queensu.ca
Fax: +1-613-533-3212
Tel: +1-613-533-6669

Abstract

We report a new class of CO2 binding organic liquids that chemically capture and release CO2 much more efficiently than aqueous alkanolamine systems. Mixtures of organic alcohols and amidine/guanidine bases reversibly bind CO2 chemically as liquid amidinium/guanidinium alkylcarbonates. The free energy of CO2 binding in these organic systems is very small and dependent on the choice of base, approximately −9 kJ mol−1 for DBU and Barton's base and +2 kJ mol−1 for 1,1,3,3-tetramethylguanidine. These CO2 capturing agents do not require an added solvent because they are liquid, and therefore have high CO2 capacities of up to 19% by weight for neat systems, and slightly less when dissolved in acetonitrile. The rate of CO2 uptake and release by these organic systems is limited by the rate of dissolution of CO2 into and out of the liquid phase. Gas absorption is selective for CO2 in both concentrated and dilute gas streams. These organic systems have been shown to bind and release CO2 for five cycles without losing activity or selectivity.

Graphical abstract: Organic liquid CO2 capture agents with high gravimetric CO2 capacity

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Article information

DOI
https://doi.org/10.1039/B809533G
Article type
Paper
Submitted
04 Jun 2008
Accepted
03 Jul 2008
First published
18 Jul 2008

Energy Environ. Sci., 2008,1, 487-493

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Organic liquid CO2 capture agents with high gravimetric CO2 capacity

D. J. Heldebrant, C. R. Yonker, P. G. Jessop and L. Phan, Energy Environ. Sci., 2008, 1, 487 DOI: 10.1039/B809533G

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