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Title: CO2 Capture from Ambient Air by Crystallization with a Guanidine Sorbent

Journal Article · · Angewandte Chemie (International Edition)
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  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division

Carbon capture and storage is an important strategy for stabilizing the increasing concentration of atmospheric CO2 and the global temperature. A possible approach toward reversing this trend and decreasing the atmospheric CO2 concentration is to remove the CO2 directly from air (direct air capture). In this paper, we report a simple aqueous guanidine sorbent that captures CO2 from ambient air and binds it as a crystalline carbonate salt by guanidinium hydrogen bonding. The resulting solid has very low aqueous solubility (Ksp=1.0(4)×10-8), which facilitates its separation from solution by filtration. The bound CO2 can be released by relatively mild heating of the crystals at 80–120 °C, which regenerates the guanidine sorbent quantitatively. Finally and thus, this crystallization-based approach to CO2 separation from air requires minimal energy and chemical input, and offers the prospect for low-cost direct air capture technologies.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Organization:
Univ. of Tennessee, Knoxville, TN (United States); Univ. of Texas, Austin, TX (United States)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1340454
Journal Information:
Angewandte Chemie (International Edition), Vol. 56, Issue 4; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 67 works
Citation information provided by
Web of Science

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Cited By (12)

Molecular Tectonics: A Node‐and‐Linker Building Block Approach to a Family of Hydrogen‐Bonded Frameworks journal July 2019
Direct air capture of CO2 via aqueous-phase absorption and crystalline-phase release using concentrated solar power journal May 2018
Precise targeting of POLR2A as a therapeutic strategy for human triple negative breast cancer journal February 2019
Fixation of atmospheric CO 2 as novel carbonate–(water) 2 –carbonate cluster and entrapment of double sulfate within a linear tetrameric barrel of a neutral bis-urea scaffold journal January 2017
Surprisingly selective sulfate extraction by a simple monofunctional di(imino)guanidinium micelle-forming anion receptor journal January 2018
Recent advances in self-assembled amidinium and guanidinium frameworks journal January 2019
Organocatalyzed carboxylative cyclization of propargylic amides with atmospheric CO 2 towards oxazolidine-2,4-diones journal January 2019
Transforming atmospheric CO 2 into alternative fuels: a metal-free approach under ambient conditions journal January 2019
A three dimensional hydrogen bonded organic framework assembled through antielectrostatic hydrogen bonds journal January 2019
Stable abnormal N-heterocyclic carbenes and their applications journal January 2020
Direct air capture of CO 2 – topological analysis of the experimental electron density (QTAIM) of the highly insoluble carbonate salt of a 2,6-pyridine-bis(iminoguanidine), (PyBIGH 2 )(CO 3 )(H 2 O) 4 journal January 2019
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Figures / Tables (3)