A molecular sieve with ultrafast adsorption kinetics for propylene separation

• 成果类型: Article
• 署名作者: 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
• 署名单位: Zhejiang University; National University of Singapore; Nanjing University; Nanjing Tech University; Nanchang University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-14058
• DOI: 10.1126/science.abn8418
• 发表日期: 2024-01-12
• 页码: 179-183
• 关键词: metal-organic framework; porous materials; co2 capture; diffusion; zeolite; dehydrogenation; flexibility; membranes; DESIGN

摘要

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).