Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Pore Modulation of Hydrogen-Bonded Organic Frameworks for Efficient Separation of Propylene

Published

Author(s)

Youlie Cai, Junkuo Gao, Jing-Hong Li, Puxu Liu, Yanchun Zheng, Wei Zhou, Hui Wu, Libo Li, Rui-Biao Lin, Banglin Chen

Abstract

Developing hydrogen-bonded organic frameworks (HOFs) that combine functional sites, size control, and storage capability for targeting gas molecule capture is a novel and challenging venture. However, there is a lack of effective strategies to tune the hydrogen-bonded network to achieve high-performance HOFs. Here, a series of HOFs termed as HOF-ZSTU-M (M=1, 2, and 3) with different pore structures are obtained by introducing structure-directing agents (SDAs) into the hydrogen-bonding network of tetrakis (4-carboxyphenyl) porphyrin (TCPP). These HOFs have distinct space configurations with pore channels ranging from discrete to continuous multi-dimensional. Singlecrystal X-ray diffraction (SCXRD) analysis reveals a rare diversity of hydrogen-bonding models dominated by SDAs. HOF-ZSTU-2, which forms a strong layered hydrogen-bonding network with ammonium (NH4 +) through multiple carboxyl groups, has a suitable 1D "pearl-chain" channel for the selective capture of propylene (C3H6). At 298 K and 1 bar, the C3H6 storage density of HOF-ZSTU-2 reaches 0.6 kgL-1, representing one of the best C3H6 storage materials, while offering a propylene/propane (C3H6/C3H8) selectivity of 12.2. Theoretical calculations and in situ SCXRD provide a detailed analysis of the binding strength of C3H6 at different locations in the pearl-chain channel. Dynamic breakthrough tests confirm that HOF-ZSTU-2 can effectively separate C3H6 from multi-mixtures.
Citation
Angewandte Chemie

Citation

Cai, Y. , Gao, J. , Li, J. , Liu, P. , Zheng, Y. , Zhou, W. , Wu, H. , Li, L. , Lin, R. and Chen, B. (2023), Pore Modulation of Hydrogen-Bonded Organic Frameworks for Efficient Separation of Propylene, Angewandte Chemie (Accessed December 12, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created September 11, 2023, Updated November 1, 2024