Efficient adsorption separation of methane from C2-C3 hydrocarbons in a Co(Ⅱ)-nodes metal-organic framework

Jie Zhang ¹Xingzhe Guo ²Bing Lin ²Guangzu Xiong ²Hanshuang Wang ¹Min Zhang ¹Liwen Fan ¹Bingwen Li ³Shuisheng Chen²

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作者信息

1. Department of Chemistry and Chemical Engineering,Taiyuan Institute of Technology,Taiyuan 030008,China
2. Engineering Research Center of Oligosaccharides,Fuyang Normal University,Fuyang 236041,China
3. Shandong Key Laboratory of Biophysics,Institute of Biophysics,Dezhou University,Dezhou 253023,China
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Abstract

Methane(CH4)as a substitute for other mineral fuels plays a crucial role in reducing energy consumption and preventing environmental pollution.The present study employs a solvothermal method to fabricate a porous framework Co-metal-organic framework(Co-MOF)containing two distinct secondary building units(SBUs):an anionic[Co2(μ2-OH)(COO)4(H2O)]and a neutral[CoN2(COO)2].Notably,within the anionic SBUs,the coordinated water molecules induce the generation of divergent unsaturated Co(Ⅱ)centers in the unidirectional porous channels,thereby creating open metal sites.The adsorption per-formance of Co-MOF towards pure component gases was systematically investigated.The results demonstrated that Co-MOF exhibits superior adsorption capacity for C2-C3 hydrocarbons compared to CH4,which offers the potential for efficient adsorption and separation of CH4 from C2-C3 hydrocarbons.The gas selectivity separation ratios of Co-MOF for C2H6/CH4 and C3H8/CH4 were calculated using the ideal adsorbed solution theory method at 273/298 K and 0.1 MPa.The results revealed that Co-MOF achieved remarkable equilibrium separation selectivity for CH4 and C2-C3 hydrocarbon gases among non-modified MOFs,signifying the potential of the synthesized Co-MOF for efficient recovery and pu-rification of CH4 from C2-C3 hydrocarbons.Breakthrough experiments further demonstrate the ability of Co-MOF to purify methane from C2-C3 hydrocarbons in practical gas separation scenarios.Additionally,molecular simulation calculations further substantiate the propensity of anionic SBUs to interact with C2-C3 hydrocarbon compounds.This study provides a novel paradigm for the development of porous MOF materials in the application of gas mixture separation.

Key words

Co-MOF/Separation hydrocarbons/Dynamic breakthrough curves/Molecular simulations adsorbent/Monte Carlo simulation

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基金项目

National Natural Science Foundation of China(21401099)

Natural Science Foundation of Shanxi Province(202203021212331)

Science and Technology Innovation Project of Colleges and Universities of Shanxi Province(2022L532)

National Natural Science Foundation of Anhui Province(2008085MB32)

National Natural Science Foundation of Anhui Province(KJ2021ZD0073)

Natural Science Foundation of Shandong Province(ZR2021QB159)

Talent Program Foundation of Dezhou University(2021xjrc102)

出版年

2024

中国化学工程学报(英文版)

中国化工学会

中国化学工程学报(英文版)

CSTPCDEI

影响因子：0.818

ISSN：1004-9541

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