Designing and Screening of Moisture‐Swing Porous Adsorbents for Rapid CO2 Capture from Air

Abstract

Quaternary amine(QA)‐functionalized adsorbents using moisture swing method are demonstrated to have vast application prospect in capturing CO2 from the ambient air. However, the poor kinetic performance and limited sorbents remain a great challenge. In this work, the porous resins were screened and membrane with controllable porous structure was designed for CO2 air capture, and the effects of the varieties of QA‐based resins and external environmental conditions (humidity and temperature) on CO2 adsorption performance were quantitatively investigated. The results show that the kinetic performance of porous resins are far superior to the existing QA‐based direct air capture(DAC) materials, and the half‐time of D290 type membrane is only 102 s, much less than that of gelatinous resin, which is about 2400 s. The effect of microporous structure on CO2 adsorption rate increases with the increase of humidity, while only slightly effect was found on macroporous adsorbents. The research results can provide basic data for the application of CO2 capture in different occasions.