Abstract
The fine-tuning of metal-organic framework (MOF) pore structures is of critical importance in developing energy-efficient xenon/krypton (Xe/Kr) separation techniques. Capitalizing on reticular chemistry, we constructed a robust Y-based MOF (NU-1801) that is isoreticular to NPF-500 with a shortened organic ligand and a larger metal radius while maintaining the 4,8-connected flu topology, giving rise to a narrowed pore structure for the efficient separation of a Xe/Kr mixture. At 298 K and 1 bar, NU-1801 possessed a moderate Xe uptake of 2.79 mmol/g but exhibited a high Xe/Kr selectivity of 8.2 and an exceptional Xe/Kr uptake ratio of about 400%. NU-1801 could efficiently separate a Xe/Kr mixture (20:80, v/v), as validated by breakthrough experiments, due to the outstanding discrimination in van der Waals interactions of Xe and Kr toward the framework confirmed by grand canonical Monte Carlo simulations. This work highlights the importance of reticular chemistry in designing structure-specific MOFs for gas separation.
Original language | English (US) |
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Pages (from-to) | 18229-18235 |
Number of pages | 7 |
Journal | ACS Applied Materials and Interfaces |
Volume | 15 |
Issue number | 14 |
DOIs | |
State | Published - Apr 12 2023 |
Funding
Y.C. gratefully acknowledges support from the National Natural Science Foundation of China (No. 22108141), Natural Science Foundation of Shandong Province (No. ZR2021QB013), Taishan Scholar Constructive Engineering Foundation (No. tsqn202211167), and Talent Fund for Province and Ministry Co-construction Collaborative Innovation Center of Eco-Chemical Engineering (No. STHGYX2212). O.K.F. gratefully acknowledges research support from the U.S. Department of Energy, Office of Science, Basic Energy Sciences Program (DE-FG02-08ER15967). Z.Q. acknowledges supports from the National Natural Science Foundation of China (No. 21978058) and the Pearl River Talent Recruitment Program (No. 2019QN01L255).
Keywords
- MOFs
- Xe/Kr separation
- gas sorption
- pore engineering
- reticular chemistry
ASJC Scopus subject areas
- General Materials Science