Hierarchical Zeolites with Amine-Functionalized Mesoporous Domains for Carbon Dioxide Capture

To prepare materials with high CO2 adsorption, a series of hierarchical LTA zeolites possessing various mesopore spaces that are decorated with alkylamines was designed and synthesized. The highest CO2 uptake capacity was achieved when (3‐aminopropyl)trimethoxysilane (APTMS) was grafted onto the hierarchical LTA zeolite having the largest mesopores. Owing to the contributions of both alkylamine groups grafted onto the mesopore surfaces and active sites in the LTA zeolites, the amount of CO2 that can be taken up on these materials is much higher than for conventional aminosilicas such SBA‐15 and MCM‐41. Furthermore, the adsorbent shows good CO2 uptake capacity and recyclability in dynamic flow conditions. How do you say…zeolite: In view of the rising concentration of CO2 in the atmosphere, the implementation of carbon capture technologies has been suggested to mitigate CO2 emissions from fossil‐fuel‐burning processes. Hierarchical LTA zeolites with amine‐functionalized mesoporous domains are synthesized and shown to capture large amounts of CO2, due to CO2 capture by both the zeolite and the amine.