Volume 135, Issue 40 e202305944
Forschungsartikel

Induced-Fit-Identification in a Rigid Metal-Organic Framework for ppm-Level CO2 Removal and Ultra-Pure CO Enrichment

Dr. Peng Hu

Dr. Peng Hu

Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-Sen University, 510275 Guangzhou, P. R. China

Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585 Singapore, Singapore

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Jialang Hu

Jialang Hu

Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-Sen University, 510275 Guangzhou, P. R. China

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Dr. Min Zhu

Dr. Min Zhu

MOE Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, 510275 Guangzhou, P. R. China

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Dr. Chao Xiong

Dr. Chao Xiong

Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-Sen University, 510275 Guangzhou, P. R. China

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Prof. Rajamani Krishna

Prof. Rajamani Krishna

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

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Prof. Dan Zhao

Corresponding Author

Prof. Dan Zhao

Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585 Singapore, Singapore

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Prof. Hongbing Ji

Corresponding Author

Prof. Hongbing Ji

Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-Sen University, 510275 Guangzhou, P. R. China

State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Institute of Green Petroleum Processing and Light Hydrocarbon Conversion, College of Chemical Engineering, Zhejiang University of Technology, 310014 Hangzhou, P. R. China

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First published: 13 June 2023

Abstract

Removing CO2 from crude syngas via physical adsorption is an effective method to yield eligible syngas. However, the bottleneck in trapping ppm-level CO2 and improving CO purity at higher working temperatures are major challenges. Here we report a thermoresponsive metal–organic framework (1 a-apz), assembled by rigid Mg2(dobdc) (1 a) and aminopyrazine (apz), which not only affords an ultra-high CO2 capacity (145.0/197.6 cm3 g−1 (0.01/0.1 bar) at 298 K) but also produces ultra-pure CO (purity ≥99.99 %) at a practical ambient temperature (TA). Several characterization results, including variable-temperature tests, in situ high-resolution synchrotron X-ray diffraction (HR-SXRD), and simulations, explicitly unravel that the excellent property is attributed to the induced-fit-identification in 1 a-apz that comprises self-adaption of apz, multiple binding sites, and complementary electrostatic potential (ESP). Breakthrough tests suggest that 1 a-apz can remove CO2 from 1/99 CO2/CO mixtures at practical 348 K, yielding 70.5 L kg−1 of CO with ultra-high purity of ≥99.99 %. The excellent separation performance is also revealed by separating crude syngas that contains quinary mixtures of H2/N2/CH4/CO/CO2 (46/18.3/2.4/32.3/1, v/v/v/v/v).

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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