Volume 59, Issue 11 pp. 4396-4400
Communication

Mixed Metal–Organic Framework with Multiple Binding Sites for Efficient C2H2/CO2 Separation

Prof. Junkuo Gao

Corresponding Author

Prof. Junkuo Gao

Institute of Functional Porous Materials, The Key laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018 China

Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249-0698 USA

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Xuefeng Qian

Xuefeng Qian

Institute of Functional Porous Materials, The Key laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018 China

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Dr. Rui-Biao Lin

Corresponding Author

Dr. Rui-Biao Lin

Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249-0698 USA

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Dr. Rajamani Krishna

Dr. Rajamani Krishna

Van't Hoff Institute of Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands

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Dr. Hui Wu

Dr. Hui Wu

NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899-6102 USA

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Dr. Wei Zhou

Corresponding Author

Dr. Wei Zhou

NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899-6102 USA

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Prof. Banglin Chen

Corresponding Author

Prof. Banglin Chen

Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249-0698 USA

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First published: 13 January 2020
Citations: 384

Graphical Abstract

Mix it up: Reported here is a mixed metal–organic framework (M′MOF), [Fe(pyz)Ni(CN)4] (FeNi-M′MOF, pyz=pyrazine), with multiple functional sites and compact one-dimensional channels of about 4.0 Å. FeNi-M′MOF, with a microporous one-dimensional channel decorated with multiple binding sites, shows a high C2H2 uptake (133 cm3 cm−3) and high C2H2/CO2 selectivity (24).

Abstract

The separation of C2H2/CO2 is particularly challenging owing to their similarities in physical properties and molecular sizes. Reported here is a mixed metal–organic framework (M′MOF), [Fe(pyz)Ni(CN)4] (FeNi-M′MOF, pyz=pyrazine), with multiple functional sites and compact one-dimensional channels of about 4.0 Å for C2H2/CO2 separation. This MOF shows not only a remarkable volumetric C2H2 uptake of 133 cm3 cm−3, but also an excellent C2H2/CO2 selectivity of 24 under ambient conditions, resulting in the second highest C2H2-capture amount of 4.54 mol L−1, thus outperforming most previous benchmark materials. The separation performance of this material is driven by π–π stacking and multiple intermolecular interactions between C2H2 molecules and the binding sites of FeNi-M′MOF. This material can be facilely synthesized at room temperature and is water stable, highlighting FeNi-M′MOF as a promising material for C2H2/CO2 separation.

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