A molecular sieve with ultrafast adsorption kinetics for propylene separation

The design of molecular sieves is vital for gas separation, but it suffers from a long-standing issue of slow adsorption kinetics due to the intrinsic contradiction between molecular sieving and diffusion within restricted nanopores. We report a molecular sieve ZU-609 with local sieving channels tha...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2024-01, Vol.383 (6679), p.179-183
Main Authors: Cui, Jiyu, Zhang, Zhaoqiang, Yang, Lifeng, Hu, Jianbo, Jin, Anye, Yang, Zhenglu, Zhao, Yue, Meng, Biao, Zhou, Yu, Wang, Jun, Su, Yun, Cui, Xili, Xing, Huabin
Format: Article
Language:English
Subjects:
Anions
Coordination polymers
Copper
Diameters
Molecular sieves
Polymers
Propane
Propylene
Separation
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Summary:The design of molecular sieves is vital for gas separation, but it suffers from a long-standing issue of slow adsorption kinetics due to the intrinsic contradiction between molecular sieving and diffusion within restricted nanopores. We report a molecular sieve ZU-609 with local sieving channels that feature molecular sieving gates and rapid diffusion channels. The precise cross-sectional cutoff of molecular sieving gates enables the exclusion of propane from propylene. The coexisting large channels constituted by sulfonic anions and helically arranged metal-organic architectures allow the fast adsorption kinetics of propylene, and the measured propylene diffusion coefficient in ZU-609 is one to two orders of magnitude higher than previous molecular sieves. Propylene with 99.9% purity is obtained through breakthrough experiments with a productivity of 32.2 L kg .
ISSN:0036-8075
1095-9203
DOI:10.1126/science.abn8418