浙江大学邢华斌团队报道了一种用于丙烯分离的具有超快吸附动力学的分子筛。相关研究成果于2023年12月14日发表在国际顶尖学术期刊《科学》。

分子筛的设计对气体分离至关重要，但由于分子筛和在受限纳米孔内扩散之间的内在矛盾，它长期存在吸附动力学缓慢的问题。

该文报道了一种具有局部筛分通道的分子筛ZU-609，其具有分子筛门和快速扩散通道。分子筛门的精确横截面截止使丙烷能够从丙烯中分离。由磺酸阴离子和螺旋排列的金属有机结构组成的共存大通道实现丙烯的快速吸附动力学，并且在ZU-609中测得的丙烯扩散系数比以前的分子筛高一到两个数量级。通过突破性实验获得纯度99.9%的丙烯，产率为32.2Lkg^-1。

附：英文原文

Title: A molecular sieve with ultrafast adsorption kinetics for propylene separation

Author: Jiyu Cui, Zhaoqiang Zhang, Lifeng Yang, Jianbo Hu, Anye Jin, Zhenglu Yang, Yue Zhao, Biao Meng, Yu Zhou, Jun Wang, Yun Su, Jun Wang, Xili Cui, Huabin Xing

Issue&Volume: 2023-12-14

Abstract: 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-section cut-off of molecular sieving gates enable the exclusion of propane from propylene. The co-existed 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 kg1.

DOI: abn8418

Source: https://www.science.org/doi/10.1126/science.abn8418