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

Abstract To prepare materials with high CO 2 adsorption, a series of hierarchical LTA zeolites possessing various mesopore spaces that are decorated with alkylamines was designed and synthesized. The highest CO 2 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 CO 2 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 CO 2 uptake capacity and recyclability in dynamic flow conditions.