A Microporous Hydrogen‐Bonded Organic Framework for the Efficient Capture and Purification of Propylene. (29th July 2021)

• Record Type: Journal Article
• Authors: Gao, Junkuo; Cai, Youlie; Qian, Xuefeng; Liu, Puxu; Wu, Hui; Zhou, Wei; Liu, De‐Xuan; Li, Libo; Lin, Rui‐Biao; Chen, Banglin
• Is Part Of: Angewandte Chemie. Volume 133:Number 37(2021)
• Page Start: 20563
• Page End: 20569
• Publication Date: 2021-07-29
• Subjects: crystal engineering -- gas separation -- hydrogen-bonded organic frameworks -- microporous -- propylene; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202106665
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Adsorptive separation of propylene/propane (C3 H6 /C3 H8 ) mixture is desired for its potential energy saving on replacing currently deployed and energy‐intensive cryogenic distillation. Realizing efficient C3 H6 /C3 H8 separation in the emerging hydrogen‐bonded organic frameworks (HOFs) is very challenging owing to the lack of functional sites for preferential gas binding. By virtue of crystal engineering, we herein report a functionalized HOF (HOF‐16 ) with free ‐COOH sites for the efficient separation of C3 H6 /C3 H8 mixtures. Under ambient conditions, HOF‐16 shows a significant C3 H6 /C3 H8 uptake difference (by 76 %) and selectivity (5.4) in contrast to other carboxylic acid‐based HOFs. Modeling studies indicate that free ‐COOH groups together with the suitable pore confinement facilitate the recognition and high‐density packing of gas molecules. The separation performance of HOF‐16 was validated by breakthrough experiments. HOF‐16 is stable towards strong acidity and water. Abstract : A robust hydrogen‐bonded organic framework with free COOH groups and suitable pore confinement demonstrates excellent performance for the important and challenging C3 H6 /C3 H8 separation.