Competitive and Cooperative CO₂-H₂O Adsorption through Humidity Control in a Polyimide Covalent Organic Framework.

ABSTRACT: In order to capture and separate CO₂ from the air or flue gas streams through nanoporous adsorbents, the influence of the humidity in these streams has to be taken into account as it hampers the capture process in two main ways: (1) water preferentially binds to CO₂ adsorption sites and lowers the overall capacity, and (2) water causes hydrolytic degradation and pore collapse of the porous framework. Here, we have used a water-stable polyimide covalent organic framework (COF) in N₂/CO₂/H₂O breakthrough studies and assessed its performance under varying levels of relative humidity (RH). We discovered that at limited relative humidity, the competitive binding of H₂O over CO₂ is replaced by cooperative adsorption. Fo

SUBMITTER: Veldhuizen H 

PROVIDER: S-EPMC10288428 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature