Jiang Xue, Pham Tony, Cao Jian-Wei, Forrest Katherine A, Wang Hui, Chen Juan, Zhang Qiu-Yu, Chen Kai-Jie
Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology Xi'an Key Laboratory of Functional Organic Porous Materials School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China.
Department of Chemistry, University of South Florida, 4202 East Fowler Avenue, CHE205, Tampa, FL, 33620-5250, USA.
Chemistry. 2021 Jun 25;27(36):9446-9453. doi: 10.1002/chem.202101060. Epub 2021 May 19.
Rigid molecular sieving materials are the ideal candidates for gas separation (e. g., C H /C H ) due to their ultrahigh adsorption selectivity and the absence of gas co-adsorption. However, the absolute molecular sieving effect for C H /C H separation has rarely been realized because of their similar physicochemical properties. Herein, we demonstrate the absolute molecular sieving of C H from C H by a rigid ultra-microporous metal-organic framework (F-PYMO-Cu) with 1D regular channels (pore size of ca. 3.4 Å). F-PYMO-Cu exhibited moderate acetylene uptake (35.5 cm /cm ), but very low ethylene uptake (0.55 cm /cm ) at 298 K and 1 bar, yielding the second highest C H /C H uptake ratio of 63.6 up to now. One-step C H production from a binary mixture of C H /C H and a ternary mixture of C H /CO /C H at 298 K was achieved and verified by dynamic breakthrough experiments. Coupled with excellent thermal and water stability, F-PYMO-Cu could be a promising candidate for industrial C separation tasks.
刚性分子筛材料因其超高的吸附选择性和不存在气体共吸附现象，是气体分离（如C₂H₂/C₂H₄）的理想候选材料。然而，由于C₂H₂和C₂H₄具有相似的物理化学性质，实现对C₂H₂/C₂H₄分离的绝对分子筛效应一直鲜有报道。在此，我们展示了一种具有一维规则通道（孔径约为3.4 Å）的刚性超微孔金属有机框架（F-PYMO-Cu）对C₂H₂和C₂H₄的绝对筛分作用。F-PYMO-Cu在298 K和1 bar下表现出适度的乙炔吸附量（35.5 cm³/cm³），但乙烯吸附量极低（0.55 cm³/cm³），产生了目前第二高的C₂H₂/C₂H₄吸附比，达63.6。通过动态突破实验实现并验证了在298 K下由C₂H₂/C₂H₄二元混合物以及C₂H₂/CO₂/C₂H₄三元混合物一步制备C₂H₂。结合出色的热稳定性和水稳定性，F-PYMO-Cu可能是工业C₂H₂分离任务的一个有前景的候选材料。
