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DOI: https://doi.org/10.1016/j.eng.2024.01.024

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Direct Ethylene Purification from Cracking Gas via a Metal–Organic Framework Through Pore Geometry Fitting

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  • a College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China
    b City University of Hong Kong (Dongguan), Dongguan 523000, China
    c Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
    d Van’t Hoff Institute for Molecular Sciences, University of Amsterdam, Amsterdam 1098 XH, Netherlands
    e State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
    f Center for Neutron Scattering, City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, China

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Abstract

The direct one-step separation of polymer-grade C2H4 from complex light hydrocarbon mixtures has high industrial significance but is very challenging. Herein, an ethylene-adsorption-weakening strategy is applied for precise regulation of the pore geometry of four tailor-made metal–organic frameworks (MOFs) with pillar-layered structures, dubbed TYUT-10/11/12/13. Based on its pore geometry design and functional group regulation, TYUT-12 exhibits exceptional selective adsorption selectivity toward C3H8, C3H6, C2H6, C2H2, and CO2 over C2H4; its C2H6/C2H4 adsorption selectivity reaches 4.56, surpassing the record value of 4.4 by Fe2(O2)(dobdc) (dobdc4− = 2,5-dioxido-1,4-benzenedicarboxylate). The weak π–π stacking binding affinity toward C2H4 in TYUT-12 is clearly demonstrated through a combination of neutron powder diffraction measurements and theoretical calculations. Breakthrough experiments demonstrate that C2H4 can be directly obtained from binary, ternary, quaternary, and six-component light hydrocarbon mixtures with over 99.95% purity.

Key words： Metal–organic frameworks; Pore regulation; Adsorptive separation; One-step purification; C; 2; H; 4; purification

Cite this article

Yang Chen,Zhenduo Wu,Longlong Fan,Rajamani Krishna,Hongliang Huang,Yi Wang,Qizhao Xiong,Jinping Li,Libo Li, . Direct Ethylene Purification from Cracking Gas via a Metal–Organic Framework Through Pore Geometry Fitting[J]. Engineering, : 0 -0 . DOI: 10.1016/j.eng.2024.01.024

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