A cationic microporous metal–organic framework for highly selective separation of small hydrocarbons at room temperature

Hui Xu; Jianfeng Cai; Shengchang Xiang; Zhangjing Zhang; Chuande Wu; Xiangtang Rao; Yuanjing Cui; Yu Yang; Rajamani Krishna; Banglin Chen; Guodong Qian

doi:10.1039/C3TA12086D

A cationic microporous metal–organic framework for highly selective separation of small hydrocarbons at room temperature†

Hui Xu,^a Jianfeng Cai,^a Shengchang Xiang,^d Zhangjing Zhang,^d Chuande Wu,^e Xiangtang Rao,^a Yuanjing Cui,^a Yu Yang,^a Rajamani Krishna,*^c Banglin Chen*^ab and Guodong Qian*^a

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* Corresponding authors

^a State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Department of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, China
E-mail: gdqian@zju.edu.cn

^b Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, USA
E-mail: banglin.chen@utsa.edu
Fax: +1 210-458-7428

^c Van't Hoff Institute for Molecule Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
E-mail: r.krishna@uva.nl

^d College of Chemistry and Materials, Fujian Normal University, 3 Shangsan Road, Cangshang Region, Fuzhou, China

^e Department of Chemistry, Zhejiang University, Hangzhou 310027, China

Abstract

A new three-dimensional cationic metal–organic framework Zn₈O(EDDA)₄(ad)₄·(HEDDA)₂·6DMF·27H₂O (ZJU-48; H₂EDDA = (E)-4,4′-(ethene-1,2-diyl)dibenzoic acid; ad = adenine) was solvothermally synthesized and structurally characterized. ZJU-48 features a three-dimensional structure with a cationic skeleton and has one-dimensional pores along the c axis of about 9.1 × 9.1 Å². The activated ZJU-48a exhibits a BET surface area of 1450 m² g⁻¹. The structural features of the charged skeleton of ZJU-48a have enabled its stronger charge-induced interaction with C₂ hydrocarbons than with C₁ methane, resulting in highly selective gas sorption of C₂ hydrocarbons over CH₄ with the adsorption selectivity over 6 at 298 K. The separation feasibility has been further established by the simulated breakthrough and pulse chromatographic experiments, thus methane can be readily separated from their quaternary mixtures at room temperature.

Journal of Materials Chemistry A

A cationic microporous metal–organic framework for highly selective separation of small hydrocarbons at room temperature†

Abstract

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A cationic microporous metal–organic framework for highly selective separation of small hydrocarbons at room temperature

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