Temperature-Dependent Separation of CO2 from Light Hydrocarbons in a Porous Self-Assembly of Vertexes Sharing Octahedra

Shun Li; Qing Li; Ting Chen; Zhen-Yu Ji; Guo-Ling Li; Ming-Yan Wu; Li-Yi Meng; Zi-Ang Nan; Wei Wang; Zhu Zhuo; Fengru Fan; You-Gui Huang

doi:10.1002/advs.202308028

Temperature-Dependent Separation of CO₂ from Light Hydrocarbons in a Porous Self-Assembly of Vertexes Sharing Octahedra

Adv Sci (Weinh). 2024 Apr;11(14):e2308028. doi: 10.1002/advs.202308028. Epub 2024 Feb 2.

Authors

Shun Li^{1

2}, Qing Li^{1

2}, Ting Chen^{1

2}, Zhen-Yu Ji³, Guo-Ling Li^{1

2}, Ming-Yan Wu³, Li-Yi Meng^{1

2}, Zi-Ang Nan^{1

2}, Wei Wang^{1

2}, Zhu Zhuo^{1

2}, Fengru Fan⁴, You-Gui Huang^{1

2}

Affiliations

¹ CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
² Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, Fujian, 361021, China.
³ State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
⁴ State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen, 361005, China.

Abstract

Design of flexible porous materials where the diffusion of guest molecules is regulated by the dynamics of contracted pore aperture is challenging. Here, a flexible porous self-assembly consisting of 1D channels with dynamic bottleneck gates is reported. The dynamic pendant naphthimidazolylmethyl moieties at the channel necks provide kinetic gate function, that enables unusual adsorption for light hydrocarbons. The adsorption for CO₂ is mainly dominated by thermodynamics with the uptakes decreasing with increasing temperature, whereas the adsorptions for larger hydrocarbons are controlled by both thermodynamics and kinetics resulting in an uptake maximum at a temperature threshold. Such an unusual adsorption enables temperature-dependent separation of CO₂ from the corresponding hydrocarbons.

Keywords: CO2/C2H2 separation; anion coordination; diffusion regulation; octahedra; supramolecular assembly.

Abstract

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