Direct air capture of CO2 with aqueous peptides and crystalline guanidines

Radu Custelcean; Kathleen A. Garrabrant; Pierrick Agullo; Neil J. Williams

doi:10.1016/j.xcrp.2021.100385

Direct air capture of CO₂ with aqueous peptides and crystalline guanidines

Radu Custelcean, Kathleen A. Garrabrant, Pierrick Agullo, Neil J. Williams

Chemical Separations Group

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

Negative emission technologies, including direct air capture (DAC) of carbon dioxide, are now considered essential for mitigating climate change, but existing DAC processes tend to have excessively high energy requirements, mostly associated with sorbent regeneration. Here, we demonstrate a promising approach to DAC that combines atmospheric CO₂ absorption by an aqueous oligopeptide (e.g., glycylglycine) with bicarbonate crystallization by a simple guanidine compound (e.g., glyoxal-bis-iminoguanidine). In this phase-changing system, the peptide and the guanidine compounds work in synergy, and the cyclic CO₂ capacity can be maximized by matching the pK_a values of the two components. Compared with glycine, the simpler amino acid congener, the cyclic CO₂ capacity of the glycylglycine peptide combined with glyoxal-bis-iminoguanidine is twice as high (0.16 mol/mol). The resulting DAC process has a significantly lower regeneration energy compared with state-of-the-art solvent-based DAC technologies.

Original language	English
Article number	100385
Journal	Cell Reports Physical Science
Volume	2
Issue number	4
DOIs	https://doi.org/10.1016/j.xcrp.2021.100385
State	Published - Apr 21 2021

Funding

This research was supported by the Department of Energy , Office of Science, Basic Energy Sciences , Chemical Sciences, Geosciences, and Biosciences Division. This research was supported by the Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division. Conceptualization, R.C.; project administration, R.C.; funding acquisition, R.C.; supervision, N.J.W. and R.C.; materials and characterization, N.J.W. and K.A.G.; Xray structural analysis, R.C.; thermodynamic measurements, K.A.G.; DAC methodology, K.A.G. and P.A.; formal analysis, K.A.G. P.A. and R.C.; writing ? original draft, R.C.; writing ? review & editing, R.C. All authors contributed to the results discussion and manuscript preparation. A US patent (10,583,387), with R.C. and N.J.W. as inventors, covering the DAC system described in this manuscript has been filed and granted. R.C. seeks to develop and commercialize a DAC technology based on the findings presented in this manuscript.

Keywords

CO capture
amino acids
direct air capture
guanidines
peptides
reactive crystallization

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.xcrp.2021.100385

Cite this

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title = "Direct air capture of CO2 with aqueous peptides and crystalline guanidines",

abstract = "Negative emission technologies, including direct air capture (DAC) of carbon dioxide, are now considered essential for mitigating climate change, but existing DAC processes tend to have excessively high energy requirements, mostly associated with sorbent regeneration. Here, we demonstrate a promising approach to DAC that combines atmospheric CO2 absorption by an aqueous oligopeptide (e.g., glycylglycine) with bicarbonate crystallization by a simple guanidine compound (e.g., glyoxal-bis-iminoguanidine). In this phase-changing system, the peptide and the guanidine compounds work in synergy, and the cyclic CO2 capacity can be maximized by matching the pKa values of the two components. Compared with glycine, the simpler amino acid congener, the cyclic CO2 capacity of the glycylglycine peptide combined with glyoxal-bis-iminoguanidine is twice as high (0.16 mol/mol). The resulting DAC process has a significantly lower regeneration energy compared with state-of-the-art solvent-based DAC technologies.",

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AU - Garrabrant, Kathleen A.

AU - Agullo, Pierrick

AU - Williams, Neil J.

PY - 2021/4/21

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N2 - Negative emission technologies, including direct air capture (DAC) of carbon dioxide, are now considered essential for mitigating climate change, but existing DAC processes tend to have excessively high energy requirements, mostly associated with sorbent regeneration. Here, we demonstrate a promising approach to DAC that combines atmospheric CO2 absorption by an aqueous oligopeptide (e.g., glycylglycine) with bicarbonate crystallization by a simple guanidine compound (e.g., glyoxal-bis-iminoguanidine). In this phase-changing system, the peptide and the guanidine compounds work in synergy, and the cyclic CO2 capacity can be maximized by matching the pKa values of the two components. Compared with glycine, the simpler amino acid congener, the cyclic CO2 capacity of the glycylglycine peptide combined with glyoxal-bis-iminoguanidine is twice as high (0.16 mol/mol). The resulting DAC process has a significantly lower regeneration energy compared with state-of-the-art solvent-based DAC technologies.

AB - Negative emission technologies, including direct air capture (DAC) of carbon dioxide, are now considered essential for mitigating climate change, but existing DAC processes tend to have excessively high energy requirements, mostly associated with sorbent regeneration. Here, we demonstrate a promising approach to DAC that combines atmospheric CO2 absorption by an aqueous oligopeptide (e.g., glycylglycine) with bicarbonate crystallization by a simple guanidine compound (e.g., glyoxal-bis-iminoguanidine). In this phase-changing system, the peptide and the guanidine compounds work in synergy, and the cyclic CO2 capacity can be maximized by matching the pKa values of the two components. Compared with glycine, the simpler amino acid congener, the cyclic CO2 capacity of the glycylglycine peptide combined with glyoxal-bis-iminoguanidine is twice as high (0.16 mol/mol). The resulting DAC process has a significantly lower regeneration energy compared with state-of-the-art solvent-based DAC technologies.

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