Gas sorption properties and kinetics of porous bismuth-based metal-organic frameworks and the selective CO2 and SF6 sorption on a new bismuth trimesate-based structure UU-200

Bismuth-based metal-organic frameworks (Bi-MOFs) such as bismuth subgallate are important for applications ranging from medicine to gas separation and catalysis. Due to the porous nature of such Bi-MOFs, it would be valuable to understand their gas sorption and separation properties. Here, we presen...

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Veröffentlicht in:Microporous and mesoporous materials 2022-01, Vol.329, p.111548, Article 111548
Hauptverfasser: Åhlén, Michelle, Kapaca, Elina, Hedbom, Daniel, Willhammar, Tom, Strømme, Maria, Cheung, Ocean
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Sprache:eng
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Zusammenfassung:Bismuth-based metal-organic frameworks (Bi-MOFs) such as bismuth subgallate are important for applications ranging from medicine to gas separation and catalysis. Due to the porous nature of such Bi-MOFs, it would be valuable to understand their gas sorption and separation properties. Here, we present the gas sorption properties of three microporous Bi-MOFs, namely, CAU-17, CAU-33, and SU-101, along with a new trimesate-based structure, UU-200. We perform a detailed analysis of the sorption properties and kinetics of these Bi-MOFs. UU-200 shows good uptake capacities for CO2 (45.81 cm3 g−1 STP) and SF6 (24.69 cm3 g−1 STP) with CO2/N2 and SF6/N2 selectivities over 35 and 44, respectively at 293 K, 100 kPa. The structure of UU-200 is investigated using continuous rotation electron diffraction and is found to be a 3D porous framework containing pores with a diameter of 3.4–3.5 Å. Bi-MOFs as a group of relatively under-investigated types of MOFs have interesting sorption properties that render them promising for greenhouse gas adsorbents with good gas uptake capacities and high selectivities. [Display omitted] •Synthesis of a new permanently porous trimesate-based bismuth metal-organic framework (MOF).•High uptake capacity and selectivity for CO2 and SF6 of UU-200 was comparable to other Bi-MOFs.•Rate-limiting mechanisms for CO2 adsorption were found to likely be governed by film diffusion and micropore diffusion.
ISSN:1387-1811
1873-3093
1873-3093
DOI:10.1016/j.micromeso.2021.111548