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Framework flexibility-driven CO₂ adsorption on a zeolite

Choi, HJ; Min, JG; Ahn, SH; Shin, J; Hong, SB; Radhakrishnan, S; Chandran, CV; ... Kirschhock, CEA; + view all (2020) Framework flexibility-driven CO₂ adsorption on a zeolite. Materials Horizons , 7 pp. 1528-1532. 10.1039/d0mh00307g. Green open access

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Abstract

Adsorption of the greenhouse gas CO₂ by ordered porous materials, although cost-efficient and eco-friendly, has not yet achieved large-scale practical application. Here, we report that zeolite framework flexibility can be exploited by tuning a subtle interplay between extra framework cations with framework oxygen and adsorbed guest molecule (CO₂). This phenomenon has been demonstrated on the Na^{+}, K^{+} and Rb^{+} orms of the small-pore zeolite gismondine with a Si/Al ratio of 3.0, which show marked cation-dependent hystereses in their CO₂ isotherms. A detailed analysis of the structures by solid state NMR and XRD revealed that the framework dynamics and the adsorption behavior is governed by the extra framework cations, which strive for coordination either with framework oxygen, guest molecules, or both. The K+ and Rb+ forms display very high CO₂ working capacities (2.8 and 3.0 mmol g^{-1}) for a 50 : 50 CO₂/CH_{4} mixture under mild temperature swing conditions (25–100 °C at 1.0 bar), as well as high CO₂/CH_{4} selectivities (36 and 28) at 25 °C. Given the excellent thermal and chemical stability of zeolites compared to other classes of adsorbents, and the here reported tuneable flexing action effected by the cations, zeolites displaying framework flexibility harbour great potential for fuel gas applications.

Type: Article
Title: Framework flexibility-driven CO₂ adsorption on a zeolite
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/d0mh00307g
Publisher version: https://doi.org/10.1039/D0MH00307G
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10098593
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