Print Email Facebook Twitter Competitive and Cooperative CO2-H2O Adsorption through Humidity Control in a Polyimide Covalent Organic Framework Title Competitive and Cooperative CO2-H2O Adsorption through Humidity Control in a Polyimide Covalent Organic Framework Author Veldhuizen, H.V. (TU Delft Novel Aerospace Materials) Butt, Saira Alam (Student TU Delft) Van Leuken, Annemiek (Student TU Delft) van der Linden, B. (TU Delft ChemE/O&O groep) Rook, W. (TU Delft ChemE/O&O groep) van der Zwaag, S. (TU Delft Novel Aerospace Materials) van der Veen, M.A. (TU Delft ChemE/Catalysis Engineering) Date 2023 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. For some conditions, the CO2 capacity was significantly higher under humid versus dry conditions (e.g., a 25% capacity increase at 343 K and 10% RH). These results in combination with FT-IR studies on equilibrated COFs at controlled RH values allowed us to assign the effect of cooperative adsorption to CO2 being adsorbed on single-site adsorbed water. Additionally, once water cluster formation sets in, loss of CO2 capacity is inevitable. Finally, the polyimide COF used in this research retained performance after a total exposure time of >75 h and temperatures up to 403 K. This research provides insight in how cooperative CO2-H2O can be achieved and as such provides directions for the development of CO2 physisorbents that can function in humid streams. Subject breakthrough experimentsCOcapturecooperative adsorptioncovalent organic frameworksFT-IR spectroscopyrelative humidity To reference this document use: http://resolver.tudelft.nl/uuid:702aff09-e166-4f8b-8680-b95504e58507 DOI https://doi.org/10.1021/acsami.3c04561 ISSN 1944-8244 Source ACS applied materials & interfaces, 15 (24), 29186-29194 Part of collection Institutional Repository Document type journal article Rights © 2023 H.V. Veldhuizen, Saira Alam Butt, Annemiek Van Leuken, B. van der Linden, W. Rook, S. van der Zwaag, M.A. van der Veen Files PDF acsami.3c04561.pdf 4.36 MB Close viewer /islandora/object/uuid:702aff09-e166-4f8b-8680-b95504e58507/datastream/OBJ/view