Chang, Chung KaiChung KaiChangKo, Ting RongTing RongKoLIN, T. Y.T. Y.LINLIN, Y. C.Y. C.LINYu, Hyun JungHyun JungYuLee, Jong SukJong SukLeeYI-PEI LIWU, H.L.H.L.WUDUN-YEN KANG2023-07-242023-07-242023-12-012399-3669https://scholars.lib.ntu.edu.tw/handle/123456789/634090Structural flexibility is a critical issue that limits the application of metal-organic framework (MOF) membranes for gas separation. Herein we propose a mixed-linker approach to suppress the structural flexibility of the CAU-10-based (CAU = Christian-Albrechts-University) membranes. Specifically, pure CAU-10-PDC membranes display high separation performance but at the same time are highly unstable for the separation of CO2/CH4. A partial substitution (30 mol.%) of the linker PDC with BDC significantly improves its stability. Such an approach also allows for decreasing the aperture size of MOFs. The optimized CAU-10-PDC-H (70/30) membrane possesses a high separation performance for CO2/CH4 (separation factor of 74.2 and CO2 permeability of 1,111.1 Barrer under 2 bar of feed pressure at 35°C). A combination of in situ characterization with X-ray diffraction (XRD) and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, as well as periodic density functional theory (DFT) calculations, unveils the origin of the mixed-linker approach to enhancing the structural stability of the mixed-linker CAU-10-based membranes during the gas permeation tests.en[SDGs]SDG13journal article10.1038/s42004-023-00917-2373018652-s2.0-85163073991https://api.elsevier.com/content/abstract/scopus_id/85163073991