Volume 62, Issue 21 e202302564
Research Article

A Microporous Metal-Organic Framework with Unique Aromatic Pore Surfaces for High Performance C2H6/C2H4 Separation

Dr. Yingxiang Ye

Dr. Yingxiang Ye

Department of Chemistry, University of North Texas, 1508 W Mulberry St., Denton, TX, 76201 USA

College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, 350007 China

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Yi Xie

Yi Xie

Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249 USA

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Dr. Yanshu Shi

Dr. Yanshu Shi

Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249 USA

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Dr. Lingshan Gong

Dr. Lingshan Gong

Department of Chemistry, University of North Texas, 1508 W Mulberry St., Denton, TX, 76201 USA

College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, 350007 China

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Dr. Joshua Phipps

Dr. Joshua Phipps

Department of Chemistry, University of North Texas, 1508 W Mulberry St., Denton, TX, 76201 USA

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Prof. Abdullah M. Al-Enizi

Prof. Abdullah M. Al-Enizi

Department of Chemistry, College of Science, King Saud University, Riyadh, 11451 Saudi Arabia

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Prof. Ayman Nafady

Prof. Ayman Nafady

Department of Chemistry, College of Science, King Saud University, Riyadh, 11451 Saudi Arabia

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Prof. Banglin Chen

Corresponding Author

Prof. Banglin Chen

College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, 350007 China

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Prof. Shengqian Ma

Corresponding Author

Prof. Shengqian Ma

Department of Chemistry, University of North Texas, 1508 W Mulberry St., Denton, TX, 76201 USA

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First published: 20 March 2023
Citations: 53

Graphical Abstract

Benefiting from the unblocked unique aromatic pore surfaces, suitable pore spaces and pore volumes, Ni-MOF 2 displays high separation performance for C2H6/C2H4 separation and produces polymer-grade C2H4 with high productivity (12 L kg−1) by a single separation process.

Abstract

Developing adsorptive separation processes based on C2H6-selective sorbents to replace energy-intensive cryogenic distillation is a promising alternative for C2H4 purification from C2H4/C2H6 mixtures, which however remains challenging. During our studies on two isostructural metal–organic frameworks (Ni-MOF 1 and Ni-MOF 2), we found that Ni-MOF 2 exhibited significantly higher performance for C2H6/C2H4 separation than Ni-MOF-1, as clearly established by gas sorption isotherms and breakthrough experiments. Density-Functional Theory (DFT) studies showed that the unblocked unique aromatic pore surfaces within Ni-MOF 2 induce more and stronger C−H⋅⋅⋅π with C2H6 over C2H4 while the suitable pore spaces enforce its high C2H6 uptake capacity, featuring Ni-MOF 2 as one of the best porous materials for this very important gas separation. It generates 12 L kg−1 of polymer-grade C2H4 product from equimolar C2H6/C2H4 mixtures at ambient conditions.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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