K2CO3 on porous supports for moisture-swing CO2 capture from ambient air

Shiqiang ZHENG, Xinyue CHENG, Wenjia ZHOU, Tong WANG, Liangliang ZHU*, Hang XIAO*, Xi CHEN

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review


Direct air capture (DAC) of CO2 is an important technology to mitigate mobile carbon emissions, reduce atmospheric CO2 concentration, and cope with climate change. Moisture-swing adsorption is regarded as one of the most promising technologies in DAC due to its low energy consumption and ease of operation. In this work, a cheap and easily available moisture-swing adsorbent of potassium carbonate loaded on porous supports (i.e., activated carbon, magnesium oxide, and zeolite) was prepared for CO2 capture from ambient air. The composite adsorbent of potassium carbonate on activated carbon showed the best performance with a DAC capacity of 0.562 mmol/g at 25°C and 5% relative humidity. The effects of temperature, relative humidity, and CO2 concentration on the adsorption performance were investigated systematically, as well as the cyclic DAC performance. In 50 adsorption–desorption cycles, the adsorption capacity of the composite adsorbent decreased by ~40% due to potassium carbonate leaching loss during water evaporation but can be fully recovered simply by re-impregnating with potassium carbonate again.
Original languageEnglish
Article numbere3058
JournalAsia-Pacific Journal of Chemical Engineering
Issue number3
Early online date18 Mar 2024
Publication statusPublished - 1 May 2024

Bibliographical note

Publisher Copyright:
© 2024 Curtin University and John Wiley & Sons Ltd.


  • activated carbon
  • direct air capture
  • moisture-swing
  • potassium carbonate


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