Efficient Splitting of Trans-/Cis-Olefins Using an Anion-Pillared Ultramicroporous Metal–Organic Framework with Guest-Adaptive Pore Channels. (April 2022)

• Record Type: Journal Article
• Authors: Zhang, Zhaoqiang; Cui, Xili; Jiang, Xiaoming; Ding, Qi; Cui, Jiyu; Zhang, Yuanbin; Belmabkhout, Youssef; Adil, Karim; Eddaoudi, Mohamed; Xing, Huabin
• Is Part Of: Engineering. Volume 11(2022)
• Page Start: 80
• Page End: 86
• Publication Date: 2022-04
• Subjects: Adsorption and separation -- Trans-/cis-butene -- Ultramicroporous metal–organic frameworks -- Pore engineering -- Guest-adaptive; Engineering -- Periodicals; Engineering -- China -- Periodicals; 620.005
• DOI: 10.1016/j.eng.2021.10.013
• Languages: English
• ISSNs: 2095-8099

Abstract

Abstract: Trans- / cis -olefin isomers play a vital role in the petrochemical industry. The paucity of energy-efficient technologies for their splitting is mainly due to the similarities of their physicochemical properties. Herein, two new tailor-made anion-pillared ultramicroporous metal–organic frameworks (MOFs), ZU-36-Ni and ZU-36-Fe (GeFSIX-3-Ni and GeFSIX-3-Fe) are reported for the first time for the efficient trans -/ cis -2-butene ( trans -/ cis -C4 H8 ) mixture splitting by enhanced molecular exclusion. Notably, ZU-36-Ni unexpectedly exhibited smart guest-adaptive pore channels for trapping trans -C4 H8 with a remarkable adsorption capacity (2.45 mmol∙g −1 ) while effectively rejecting cis -C4 H8 with a high purity of 99.99%. The dispersion-corrected density functional theory (DFT-D) calculation suggested that the guest-adaptive behavior of ZU-36-Ni in response to trans -C4 H8 is derived from the organic linker rotation and the optimal pore dimensions, which not only improve the favorable adsorption/diffusion of trans -C4 H8 with optimal host–guest interactions, but also enhance the size-exclusion of cis -C4 H8 . This work opens a new avenue for pore engineering in advanced smart or adaptive porous materials for specific applications involving guest molecular recognition.