A molecular sieve with ultrafast adsorption kinetics for propylene separation.
- Resource Type
- Article
- 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,
- Source
- Science; 1/12/2024, Vol. 383 Issue 6679, p179-183, 5p, 3 Diagrams
- Subject
- Molecular sieves
Adsorption kinetics
Propene
Separation of gases
Diffusion coefficients
Diffusion
- Language
- ISSN
- 00368075
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−1. [ABSTRACT FROM AUTHOR]