Issue 40, 2023

Hydrogen-bonded organic framework with tailored pores prepared by enlarging the core size for high-performance Xe/Kr separation

Abstract

The efficient separation of xenon (Xe) and krypton (Kr) mixtures is a valuable but challenging process in the gas industry. Hydrogen-bonded organic frameworks (HOFs) have emerged as a promising class of porous materials for gas separation; however, due to the lack of available design methods, accurately adjusting the pore size of HOFs to improve the separation performance remains a major challenge. Herein, we present a pore engineering optimized strategy by enlarging the core size of the rigid monomers to increase the pore size of benzene cyanide-based HOFs. The replacement of the benzene ring in the molecular core of HOF-40 with a larger-sized dipyrrole ring resulted in the assembly of HOF-FJU-8a with a slightly larger pore size of 4.2 × 4.6 Å2, which is demonstrated as the highest performing HOF material for Xe/Kr separation reported to date. The superior Xe/Kr separation was determined by the gas adsorption and dynamic breakthrough experiments, showing a separation factor of 8.5 and a Kr productivity over 72 L kg−1 from the binary Xe/Kr mixture. The tailored pore size of HOF-FJU-8a played a crucial role in enabling the significant differential host–guest interactions and binding affinity, as confirmed by the single crystal structures of Xe-or Kr-loaded HOF-FJU-8a and GCMC calculations.

Graphical abstract: Hydrogen-bonded organic framework with tailored pores prepared by enlarging the core size for high-performance Xe/Kr separation

Supplementary files

Article information

Article type
Paper
Submitted
08 8 2023
Accepted
19 9 2023
First published
20 9 2023

J. Mater. Chem. A, 2023,11, 21857-21863

Hydrogen-bonded organic framework with tailored pores prepared by enlarging the core size for high-performance Xe/Kr separation

Z. Yuan, L. Chen, X. Zhou, L. Li, Y. Li, Y. Yang, Z. Zhou, Y. Chen, S. Xiang, B. Chen and Z. Zhang, J. Mater. Chem. A, 2023, 11, 21857 DOI: 10.1039/D3TA04738E

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