Highly Efficient CO2 Capture from Wet-Hot Flue Gas by a Robust Trap-and-Flow Crystal

Highly selective CO2 capture from flue gasbased onadsorption technology is among the largest challenge on the horizon,due to its high temperature (>333 K), lower partial pressure (0.1-0.2bar), and competition from water. Due to the designable and tunablepore system, porous coordination polymers (PCPs) have been consideredas the most exciting discoveries in porous materials. However, therational design and function-led preparation of the pore system thatpermits highly selective CO2 capture from flue gas (CO2/N-2/O-2/CO/H2O) remains agreat challenge. Herein, we report a highly selective CO2 capture from wet-hot (363 K, RH = 40%) flue gas by a robusttrap-and-flow crystal (NTU-67). Crystallographic analysisshowed that the flow channel provides plausible CO2 traffic,while the confined trap works as an accommodation for captured gasmolecules. Further, the hydrophobic pore surface endows the functionof the channels that are not influenced by hot moisture, a major obstacleto overcome direct CO2 capture by PCPs. The integral natureof NTU-67, including good stability in SO2, meets the key prerequisites that are usually considered for practicalapplications. The molecular insight and highly efficient CO2 capture make us believe that different nanospace with their ownduties may be extended into ingenious design of more advanced adsorbentsfor cost-effective and promising for CO2 capture from fluegas.