Copper-Doped Small Pore Zeolites for CO2 Capture by Honeycomb Rotor with Low Temperature Regeneration

The high-energy demand of CO2 capture is one of the main challenges for large-scale industrial carbon capture and storage. Transition metal cation-exchanged small pore zeolites with eight-membered ring (8MR) windows are attractive for CO2 capture with high selectivity over N2 due to their size exclusion as well as the electrostatic interaction between transition metal cations and CO2 molecules. In this work, Cu-doped small pore zeolites were synthesized for an investigation on their adsorption behaviors of CO2. Interestingly, Cu-doped RHO zeolites show the highest variation in the adsorption capacity of CO2 at the temperature between 25 and 65 °C among the small pore zeolites investigated, which make them good candidates as adsorbents used for CO2 capture by temperature swing adsorption (TSA) with a honeycomb rotor. A concept design of the CO2 capture system based on a RHO zeolite honeycomb rotor has been proposed, which will allow for a low temperature regeneration of CO2 adsorbents.