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Research Article

Highly selective adsorption of light hydrocarbons in a HKUST-like MOF constructed from spirobifluorene-based octacarboxylate ligand by a substitution strategy

Xinli Shi, Yucong Zu, Xilin Li, Tongyi Zhao, Hao Ren, Fuxing Sun( )
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China
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Graphical Abstract

According to reticular chemistry, we designed HKUST-like metal-organic framework (MOF) by a substitution strategy, and synthesized a copper-organic framework, JUC-220. JUC-220 exhibited high adsorption selectivity of C3H8/CH4 (5/85) and C2H6/CH4 (10/85) among most reported MOFs as well as excellent C3H8 and C2H6 adsorption performance at low pressure.

Abstract

Metal-organic frameworks (MOFs) with HKUST-like tbo structures have been paid specific attention for gas sorption and separation because of their specific pore features. According to the geometric similarity of spirobifluorene and [Cu2(O2CR)4] paddlewheel secondary building units (Cu2 SBUs) in HKUST-1, we attempted to rationally construct a HKUST-like MOF by a substitution strategy. Using a judiciously designed octatopic carboxylate ligand, a copper-organic framework, JUC-220, was synthesized. The crystals of JUC-220 exhibited characteristic features in cubic with disorder, possibly due to the disorder substitution and high symmetry of tbo topology. Two related HKUST-like structure models were considered. Thanks to the suitable pore size and specific pore shapes, the adsorption selectivities of JUC-220 for C3H8/CH4 (5/85) and C2H6/CH4 (10/85) gas mixtures were as high as 736 and 46 respectively at 298 K and 1 bar. Specially, JUC-220 exhibited excellent trace adsorption performance of C3H8 and C2H6 as well as reverse adsorption behavior of C2H6/C2H4. Thus, JUC-220 serves as an example of HKUST-like MOF with disorder for light hydrocarbons separation and the implementation of substitution which can be used to explore more porous MOFs.

Keywords

HKUST-like metal-organic frameworks (MOFs)reticular chemistrydisordersubstitutiontrace adsorptionlight hydrocarbons separation

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Nano Research
Volume 16 Issue 7,
July 2023
Pages 10652-10659
DOI: 10.1007/s12274-023-5634-x
Cite this article:
Shi X, Zu Y, Li X, et al. Highly selective adsorption of light hydrocarbons in a HKUST-like MOF constructed from spirobifluorene-based octacarboxylate ligand by a substitution strategy. Nano Research, 2023, 16(7): 10652-10659. https://doi.org/10.1007/s12274-023-5634-x
Topics:
Gas adsorptionMethanol fuelsMicroporosity Organic frameworks

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Received: 15 November 2022
Revised: 13 February 2023
Accepted: 02 March 2023
Published: 20 April 2023
© Tsinghua University Press 2023
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