Selective sorting of hexane isomers by anion-functionalized metal-organic frameworks with optimal energy regulation

Qingju Wang, Lifeng Yang, Tian Ke, Jianbo Hu, Xian Suo, Xili Cui () and Huabin Xing ()
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Qingju Wang: Zhejiang University
Lifeng Yang: Zhejiang University
Tian Ke: Zhejiang University
Jianbo Hu: Zhejiang University
Xian Suo: Zhejiang University
Xili Cui: Zhejiang University
Huabin Xing: Zhejiang University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Extensive efforts have been made to improve the separation selectivity of hydrocarbon isomers with nearly distinguishable boiling points; however, how to balance the high regeneration energy consumption remains a daunting challenge. Here we describe the efficient separation of hexane isomers by constructing and exploiting the rotational freedom of organic linkers and inorganic SnF62− anions within adaptive frameworks, and reveal the nature of flexible host-guest interactions to maximize the gas-framework interactions while achieving potential energy storage. This approach enables the discrimination of hexane isomers according to the degree of branching along with high capacity and record mono-/di-branched selectivity (6.97), di-branched isomers selectivity (22.16), and upgrades the gasoline to a maximum RON (Research Octane Number) of 105. Benefitting from the energy regulation of the flexible pore space, the material can be easily regenerated only through a simple vacuum treatment for 15 minutes at 25 °C with no temperature fluctuation, saving almost 45% energy compared to the commercialized zeolite 5 A. This approach could potentially revolutionize the whole scenario of alkane isomer separation processes.

Date: 2024
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DOI: 10.1038/s41467-024-46738-2

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