Anchoring LiCl in the Nanopores of Metal–Organic Frameworks for Ultra‐High Uptake and Selective Separation of Ammonia

作者：Yunlei Shi, Zhenxiang Wang, Zhiyong Li, Huiyong Wang, Dazhen Xiong, Jikuan Qiu, Xiaoxin Tian, Guang Feng, Jianji Wang · 发表于：Angewandte Chemie International Edition · 年份：2022 · DOI：10.1002/anie.202212032 · 被引用次数：101 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Covalent Organic Framework Applications、Advanced Photocatalysis Techniques

Abstract Ammonia (NH 3 ) is an important chemical raw material and a unique carbon‐free fuel with high hydrogen energy density. Thus, NH 3 capture, storage, and desorption are of significant importance. However, high capacity capture, low energy desorption, and selective separation of NH 3 are still challengs so far. Here, we report high‐performance hybrid sorbents by anchoring LiCl in the nanopores of MIL‐53‐(OH) 2 metal–organic frameworks (MOFs). It is found that the optimal composite shows a capture capacity of 33.9 mmol g −1 NH 3 at 1.0 bar and 25 °C, which far exceeds the current record among the reported porous materials. Notably, the excellent capture capacity at low pressure and high temperature makes it possible to selectively capture NH 3 from NH 3 /N 2 , NH 3 /CO 2 , and NH 3 /H 2 O. It is revealed that synergistic action of NH 3 coordination to the highly dispersed Li + in the MOF nanopores and hydrogen bonding of NH 3 with Cl − account for such an excellent capture and selectivity performance.