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Research Article

Hydrogen-bonded metal-nucleobase frameworks for highly selective capture of ethane/propane from methane and methane/nitrogen separation

Ying Liu1, Qianqian Xu1, Lihang Chen1, Changhua Song1, Qiwei Yang1,2, Zhiguo Zhang1,2, Dan Lu1, Yiwen Yang1,2, Qilong Ren1,2, Zongbi Bao1,2( )
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
Institute of Zhejiang University-Quzhou, Quzhou 324000, China
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Graphical Abstract

Two hydrogen-bonded metal-nucleobase frameworks are used to separate high purity CH4 from CH4/C2H6/C3H8 mixtures and efficiently separate CH4/N2.

Abstract

The separation of light hydrocarbons, including C2H6 and C3H8, is essential to natural gas upgrading. Meanwhile, N2 removal from CH4 is also crucial to concentrating low-quality coalbed methane, but the adsorption process is challenging because of the close kinetic diameter. This work reports two hydrogen-bonded metal-nucleobase frameworks (HOF-ZJU-201 and HOF-ZJU-202) capable of efficiently separating C3H8/CH4, C2H6/CH4, and CH4/N2. Due to strong affinity for C3H8 and C2H6, the low-pressure capacity for C3H8 (5 kPa) and C2H6 (10 kPa) of HOF-ZJU-201a exceeds most adsorbents. The ideal adsorbed solution theory (IAST) selectivity of C3H8/CH4 and C2H6/CH4 is 119 and 45 at ambient conditions. According to density functional theory calculations, surface polarization environments formed by electron-rich anions and electron-deficient purine heterocyclic rings contribute to the selective capture of C3H8 and C2H6 with greater polarizability. Furthermore, the high CH4 adsorption capacity (1.73 mmol/g for HOF-ZJU-201a and 1.50 mmol/g for HOF-ZJU-202a at 298 K and 1.0 bar) and excellent CH4/N2 selectivity (6.0 for HOF-ZJU-201 at 298 K), as well as dynamic breakthrough experiments of binary CH4/N2 gas mixture implied their efficacy in the concentration of low-quality coalbed methane.

Keywords

hydrogen-bonded frameworksmethanenatural gasadsorption separation

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Nano Research
Volume 15 Issue 8,
August 2022
Pages 7695-7702
DOI: 10.1007/s12274-022-4352-0
Cite this article:
Liu Y, Xu Q, Chen L, et al. Hydrogen-bonded metal-nucleobase frameworks for highly selective capture of ethane/propane from methane and methane/nitrogen separation. Nano Research, 2022, 15(8): 7695-7702. https://doi.org/10.1007/s12274-022-4352-0
Topics:
Gas adsorption

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Received: 16 February 2022
Revised: 18 March 2022
Accepted: 22 March 2022
Published: 02 May 2022
© Tsinghua University Press 2022
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