Efficient Splitting of Trans-/Cis-Olefins Using an Anion-Pillared Ultramicroporous Metal-Organic Framework with Guest-Adaptive Pore Channels  

作　　者：Zhaoqiang Zhang Xili Cui Xiaoming Jiang Qi Ding Jiyu Cui Yuanbin Zhang Youssef Belmabkhout Karim Adil Mohamed Eddaoudi Huabin Xing 

机构地区：[1]Key Laboratory of Biomass Chemical Engineering of Ministry of Education,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China [2]State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China [3]Advanced Membranes and Porous Materials Center,King Abdullah University of Science and Technology,Thuwal 23955,Saudi Arabia

出　　处：《Engineering》2022年第4期80-86,共7页工程（英文）

基　　金：supported by the Zhejiang Provincial Natural Science Foundation of China (LZ18B060001);the National Natural Science Foundation of China (21725603, 21476192, and U1862110)

摘　　要：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-C_(4)H_(8))mixture splitting by enhanced molecular exclusion.Notably,ZU-36-Ni unexpectedly exhibited smart guest-adaptive pore channels for trapping trans-C_(4)H_(8)with a remarkable adsorption capacity(2.45 mmol∙g^(−1))while effectively rejecting cis-C_(4)H_(8)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-C_(4)H_(8)is derived from the organic linker rotation and the optimal pore dimensions,which not only improve the favorable adsorption/diffusion of trans-C_(4)H_(8)with optimal host–guest interactions,but also enhance the size-exclusion of cis-C_(4)H_(8).This work opens a new avenue for pore engineering in advanced smart or adaptive porous materials for specific applications involving guest molecular recognition.

关 键 词：Adsorption and separation Trans-/cis-butene Ultramicroporous metal-organic frameworks Pore engineering Guest-adaptive 

分 类 号：TQ221.2[化学工程—有机化工]