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

Yang Chen, Zhenduo Wu, Longlong Fan, Rajamani Krishna, Hongliang Huang, Yi Wang, Qizhao Xiong, Jinping Li, Libo Li

Engineering ›› 2024, Vol. 41 ›› Issue (10) : 84-92.

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Engineering ›› 2024, Vol. 41 ›› Issue (10) : 84-92. DOI: 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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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.

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Metal-organic frameworks / Pore regulation / Adsorptive separation / One-step purification / C2H4 purification

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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. Engineering, 2024, 41(10): 84‒92 https://doi.org/10.1016/j.eng.2024.01.024

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