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Title: CO 2 Capture from Ambient Air by Crystallization with a Guanidine Sorbent

Carbon capture and storage is an important strategy for stabilizing the increasing concentration of atmospheric CO 2 and the global temperature. A possible approach toward reversing this trend and decreasing the atmospheric CO 2 concentration is to remove the CO 2 directly from air (direct air capture). In this paper, we report a simple aqueous guanidine sorbent that captures CO 2 from ambient air and binds it as a crystalline carbonate salt by guanidinium hydrogen bonding. The resulting solid has very low aqueous solubility (K sp=1.0(4)×10 -8), which facilitates its separation from solution by filtration. The bound CO 2 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 CO 2 separation from air requires minimal energy and chemical input, and offers the prospect for low-cost direct air capture technologies.
Authors:
 [1] ;  [2] ;  [1] ;  [2] ;  [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
  2. (United States). Dept. of Chemistry
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Angewandte Chemie (International Edition)
Additional Journal Information:
Journal Name: Angewandte Chemie (International Edition); Journal Volume: 56; Journal Issue: 4; Journal ID: ISSN 1433-7851
Publisher:
Wiley
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Contributing Orgs:
Univ. of Tennessee, Knoxville, TN (United States); Univ. of Texas, Austin, TX (United States)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; carbon capture; crystallization; guanidines; hydrogen bonding; sustainable chemistry
OSTI Identifier:
1340454

Seipp, Charles A., Univ. of Texas, Austin, TX, Williams, Neil J., Univ. of Tennessee, Knoxville, TN, Kidder, Michelle K., and Custelcean, Radu. CO2 Capture from Ambient Air by Crystallization with a Guanidine Sorbent. United States: N. p., Web. doi:10.1002/anie.201610916.
Seipp, Charles A., Univ. of Texas, Austin, TX, Williams, Neil J., Univ. of Tennessee, Knoxville, TN, Kidder, Michelle K., & Custelcean, Radu. CO2 Capture from Ambient Air by Crystallization with a Guanidine Sorbent. United States. doi:10.1002/anie.201610916.
Seipp, Charles A., Univ. of Texas, Austin, TX, Williams, Neil J., Univ. of Tennessee, Knoxville, TN, Kidder, Michelle K., and Custelcean, Radu. 2016. "CO2 Capture from Ambient Air by Crystallization with a Guanidine Sorbent". United States. doi:10.1002/anie.201610916. https://www.osti.gov/servlets/purl/1340454.
@article{osti_1340454,
title = {CO2 Capture from Ambient Air by Crystallization with a Guanidine Sorbent},
author = {Seipp, Charles A. and Univ. of Texas, Austin, TX and Williams, Neil J. and Univ. of Tennessee, Knoxville, TN and Kidder, Michelle K. and Custelcean, Radu},
abstractNote = {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.},
doi = {10.1002/anie.201610916},
journal = {Angewandte Chemie (International Edition)},
number = 4,
volume = 56,
place = {United States},
year = {2016},
month = {12}
}

Works referenced in this record:

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