Ammonia Hydration in a Cu(II)‐Pyrazolate Framework for Efficient Trace Capture
Abstract
Abstract Ammonia (NH 3 ) emissions from industrial and agricultural activities pose severe environmental and health issues. Trace NH 3 capture typically relies on chemisorption at Lewis acid sites or physisorption on porous adsorbents but usually suffers from irreversible binding, energy‐intensive regeneration, and structural degradation. In this work, for the first time, we demonstrate a new hydration pathway as a promising solution. In a Cu(II)‐pyrazolate framework, BUT‐64(H 2 O), the bridging water molecules between adjacent Cu(II) ions serve as Brønsted acid sites to hydrate ammonia, achieving a remarkable NH 3 packing density of 0.27 g cm −3 at 0.1 kPa and an adsorption capacity of 1.51 mmol g −1 for 1000 ppm NH 3 under 80% relative humidity, among the leading adsorbents. The reversible hydration mechanism combines enhanced NH 3 affinity with facile regeneration and mitigated moisture co‐adsorption, overcoming the inherent trade‐off. The remarkable alkaline stability of this material also highlights its potential as an energy‐efficient sorbent for trace NH 3 capture.
Article Details
Authors (6)
Guang‐Rui Si
State Key Laboratory of Materials Low‐Carbon Recycling Beijing University of Technology Beijing 100124 China
Xiang‐Jing Kong
Department of Chemical Engineering College of Materials Science and Engineering Beijing University of Technology Beijing 100124 China
Tao He
Department of Chemical Science, Bernal Institute
Jia‐Teng Zhao
Department of Chemical Engineering College of Materials Science and Engineering Beijing University of Technology Beijing 100124 China
Lin‐Hua Xie
Department of Chemical Engineering College of Materials Science and Engineering Beijing University of Technology Beijing 100124 China
Jian‐Rong Li
Department of Chemical Engineering College of Materials Science and Engineering Beijing University of Technology Beijing 100124 China