期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 37, 页码 20400-20406出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202106665
关键词
crystal engineering; gas separation; hydrogen-bonded organic frameworks; microporous; propylene
资金
- Zhejiang Provincial Natural Science Foundation of China [LY20E020001]
- Hundred Talents Program of Sun Yat-Sen University
- National Natural Science Foundation of China [21606163, 21878205, 21922810]
- Welch Foundation [AX-1730]
This study presents a functionalized HOF-16 with free -COOH sites for efficient separation of propylene/propane mixtures, showing high selectivity and uptake difference. Through crystal engineering, the recognition and high-density packing of gas molecules are facilitated for improved separation performance.
Adsorptive separation of propylene/propane (C3H6/C3H8) mixture is desired for its potential energy saving on replacing currently deployed and energy-intensive cryogenic distillation. Realizing efficient C3H6/C3H8 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 C3H6/C3H8 mixtures. Under ambient conditions, HOF-16 shows a significant C3H6/C3H8 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.
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