A Hydrogen‐Bonded Organic Framework (HOF) with Type IV NH3 Adsorption Behavior

• Published in: Angewandte Chemie International Edition Vol. 58; no. 45; pp. 16152 - 16155
• Main Authors: Kang, Dong Won, Kang, Minjung, Kim, Hyojin, Choe, Jong Hyeak, Kim, Dae Won, Park, Jeoung Ryul, Lee, Woo Ram, Moon, Dohyun, Hong, Chang Seop
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 04-11-2019
• Edition: International ed. in English
• Subjects: Acetylene; Ammonia; ammonia adsorption; Carbon dioxide; hydrogen-bonded organic frameworks (HOFs); Porous materials; Pressure swing adsorption; Regeneration; S-shaped isotherm; Temperature requirements; Work capacity
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201911087

An S‐shaped gas isotherm pattern displays high working capacity in pressure‐swing adsorption cycle, as established for CO2, CH4, acetylene, and CO. However, to our knowledge, this type of adsorption behavior has not been revealed for NH3 gas. Herein, we design and characterize a hydrogen‐bonded organic framework (HOF) that can adsorb NH3 uniquely in an S‐shape (type IV) fashion. While conventional porous materials, mostly with type I NH3 adsorption behavior, require relatively high regeneration temperature, this platform which has significant working capacity is easily regenerated and recyclable at room temperature.
Easy come, easy go: A hydrogen‐bonded organic framework (HOF) can interact with NH3 to give a type IV ammonia isotherm. This characteristic is responsible for high working capacity and facile release of NH3 under mild conditions.