大连理工大学陆安慧团队报告了摆动介孔动力学方法放大吸附分离丙烯/丙烷。相关研究成果发表在2021年6月18日出版的《德国应用化学》。
吸附分离是丙烯和丙烷分离的一种有吸引力的技术；然而，挑战在于如何设计高效的吸附剂来区分两种性质非常相似的分子。
该文中，研究人员通过在结构坚固的碳整体中创造摆动介孔的动力学放大分离方法。宽段和窄段交替的摆动介孔的比表面积为413m2g-1，孔径分布呈三峰分布，中心分别为1.5nm、4.2nm和6.6nm。对协同动力学和平衡效应进行了观察和定量评估，确保了丙烯/丙烷的显著选择性达到39。该选择性不仅优于现有的碳吸附剂，而且在占主导地位的晶体多孔吸附剂中具有很强的竞争力。
此外，摇摆的介孔炭整体表现出良好的轴向和径向压缩强度，分别为5.5MPa和221Ncm-1左右，保证了其在实际分子分离中的巨大潜力。
附：英文原文
Title: Wiggling Mesopores Kinetically Amplified Adsorptive Separation of Propylene/Propane
Author: Ya-Fei Yuan, Yong-Sheng Wang, Xue-Liang Zhang, Wen-Cui Li, Guang-Ping Hao, Lu Han, An-Hui Lu
Issue&Volume: 2021-06-18
Abstract: Adsorptive separation is an appealing technology for propylene and propane separation; however, the challenge lies in the design of efficient adsorbents which can distinguish the two molecules having very similar properties. Here we report a kinetically amplified separation by creating wiggling mesopores in structurally robust carbon monoliths. The wiggling mesopores with alternating wide and narrow segments afford a surface area of 413 m 2 g -1 and a tri-modal pore size distribution centered at 1.5, 4.2 and 6.6 nm, respectively. The synergistically kinetic and equilibrium effects were observed and quantitatively assessed, which together ensured a remarkable propylene/propane selectivity up to 39. This selectivity outperformed not only the available carbon adsorbents but also highly competitive among the dominated crystalline porous adsorbents. In addition, the wiggling mesoporous carbon monoliths showed an excellent axial and radial compressive strength of around 5.5 MPa and 221 N cm -1 , respectively, which ensured its great potential in practical molecular separations.
DOI: 10.1002/anie.202106523
Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202106523
