Frontispiece: Induced-Fit-Identification in a Rigid Metal-Organic Framework for ppm-Level CO2 Removal and Ultra-Pure CO Enrichment |
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Authors: | Dr Peng Hu Jialang Hu Dr Min Zhu Dr Chao Xiong Prof Rajamani Krishna Prof Dan Zhao Prof Hongbing Ji |
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Institution: | 1. Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-Sen University, 510275 Guangzhou, P.?R. China;2. MOE Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, 510275 Guangzhou, P.?R. China;3. Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098?XH Amsterdam, The Netherlands;4. Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585 Singapore, Singapore |
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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). |
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Keywords: | CO2/CO Separation Induced-Fit-Identification Metal-Organic Frameworks Syngas Purification Thermoresponsive Effect |
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