Water-Triggered Direct Air Capture by Strong Organic Bases

Anders Grundtvig Utzon; Ji Woong Lee

doi:10.1002/cssc.202402685

Water-Triggered Direct Air Capture by Strong Organic Bases

Anders Grundtvig Utzon, Ji Woong Lee^*

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

A key challenge for sorbent-mediated temperature-swing direct air capture remains to maximize the difference in CO₂ loading under capture and regeneration conditions (i. e. the working capacity) while minimizing the thermal energy input required to alternate between the two equilibrium states. Herein, peralkylated guanidines were shown to capture close to 1 molar equivalent (or up 4.5 mol CO₂/kg absorbent) directly from moist air (>60 % RH) at room temperature and completely release the entire quantity of captured CO₂ upon co-evaporation of water at 70 °C affording concentrated CO₂ with a vapor content of 3 mol% and achieving a high working capacity with minimum temperature swing of 45 °C.

Original language	English
Article number	e202402685
Journal	ChemSusChem
ISSN	1864-5631
DOIs	https://doi.org/10.1002/cssc.202402685
Publication status	Accepted/In press - 2025

Bibliographical note

Funding Information:
The generous support from the Department of Chemistry, University of Copenhagen, and the NNF CO Research Center (CORC, NNF21SA0072700) is gratefully acknowledged. We also thank our analytical departments for their kind support and P. M\u00F3nica for proofreading. 2

Publisher Copyright:
© 2025 The Author(s). ChemSusChem published by Wiley-VCH GmbH.

Keywords

carbon capture
CO
direct air capture
guanidine
water

Access to Document

10.1002/cssc.202402685Licence: CC BY

Cite this

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title = "Water-Triggered Direct Air Capture by Strong Organic Bases",

abstract = "A key challenge for sorbent-mediated temperature-swing direct air capture remains to maximize the difference in CO2 loading under capture and regeneration conditions (i. e. the working capacity) while minimizing the thermal energy input required to alternate between the two equilibrium states. Herein, peralkylated guanidines were shown to capture close to 1 molar equivalent (or up 4.5 mol CO2/kg absorbent) directly from moist air (>60 % RH) at room temperature and completely release the entire quantity of captured CO2 upon co-evaporation of water at 70 °C affording concentrated CO2 with a vapor content of 3 mol% and achieving a high working capacity with minimum temperature swing of 45 °C.",

keywords = "carbon capture, CO, direct air capture, guanidine, water",

author = "{Grundtvig Utzon}, Anders and Lee, {Ji Woong}",

note = "Funding Information: The generous support from the Department of Chemistry, University of Copenhagen, and the NNF CO Research Center (CORC, NNF21SA0072700) is gratefully acknowledged. We also thank our analytical departments for their kind support and P. M\u00F3nica for proofreading. 2 Publisher Copyright: {\textcopyright} 2025 The Author(s). ChemSusChem published by Wiley-VCH GmbH.",

year = "2025",

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journal = "ChemSusChem",

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T1 - Water-Triggered Direct Air Capture by Strong Organic Bases

AU - Grundtvig Utzon, Anders

AU - Lee, Ji Woong

N1 - Funding Information: The generous support from the Department of Chemistry, University of Copenhagen, and the NNF CO Research Center (CORC, NNF21SA0072700) is gratefully acknowledged. We also thank our analytical departments for their kind support and P. M\u00F3nica for proofreading. 2 Publisher Copyright: © 2025 The Author(s). ChemSusChem published by Wiley-VCH GmbH.

PY - 2025

Y1 - 2025

N2 - A key challenge for sorbent-mediated temperature-swing direct air capture remains to maximize the difference in CO2 loading under capture and regeneration conditions (i. e. the working capacity) while minimizing the thermal energy input required to alternate between the two equilibrium states. Herein, peralkylated guanidines were shown to capture close to 1 molar equivalent (or up 4.5 mol CO2/kg absorbent) directly from moist air (>60 % RH) at room temperature and completely release the entire quantity of captured CO2 upon co-evaporation of water at 70 °C affording concentrated CO2 with a vapor content of 3 mol% and achieving a high working capacity with minimum temperature swing of 45 °C.

AB - A key challenge for sorbent-mediated temperature-swing direct air capture remains to maximize the difference in CO2 loading under capture and regeneration conditions (i. e. the working capacity) while minimizing the thermal energy input required to alternate between the two equilibrium states. Herein, peralkylated guanidines were shown to capture close to 1 molar equivalent (or up 4.5 mol CO2/kg absorbent) directly from moist air (>60 % RH) at room temperature and completely release the entire quantity of captured CO2 upon co-evaporation of water at 70 °C affording concentrated CO2 with a vapor content of 3 mol% and achieving a high working capacity with minimum temperature swing of 45 °C.

KW - carbon capture

KW - CO

KW - direct air capture

KW - guanidine

KW - water

U2 - 10.1002/cssc.202402685

DO - 10.1002/cssc.202402685

M3 - Journal article

C2 - 39903873

AN - SCOPUS:85218204280

SN - 1864-5631

JO - ChemSusChem

JF - ChemSusChem

M1 - e202402685

ER -