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CO2 and SF6 adsorpt...
CO2 and SF6 adsorption on mixed-linker ZIF-7-8s: The effect of linker substitution on gas uptake and selectivity
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- Åhlén, Michelle (författare)
- Uppsala universitet,Nanoteknologi och funktionella material,Uppsala University
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- Jaworski, Aleksander (författare)
- Stockholms Universitet, Institutionen för material- och miljökemi
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- Strömme, Maria, 1970- (författare)
- Uppsala universitet,Nanoteknologi och funktionella material
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- Cheung, Ocean (författare)
- Uppsala universitet,Nanoteknologi och funktionella material
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(creator_code:org_t)
- 2021
- 2021
- Engelska.
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Ingår i: 8th Conference of the Federation of European Zeolite Associations (FEZA 2021), Virtual Event, July 5-9, 2021.
- Relaterad länk:
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https://urn.kb.se/re...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- A series of mixed-linker Zeolitic Imidazolate Framework(ZIF)-7–8s constructed from varying amounts of benzimidazolate (bIm) and 2-methylimidazolate (mIm) linkers are reported in this study. We demonstrate that the particle morphology and pore size of ZIF-7–8 can be tailored by carefully adjusting the ratios between bIm and mIm linkers in the frameworks resulting in a significantly enhanced CO2 or SF6 uptake capacity and selectivity. ZIF-7–8 containing 90% bIm and 10% mIm linkers were shown to have a CO2 uptake capacity of 1.44 mmol g−1 at 293 K (1 bar) and a CO2/N2 selectivity of over 30. While ZIF-7–8 with 26% bIm and 74% mIm linkers had a SF6 uptake of 2.08 mmol g−1 at 293 K (1 bar) and a high SF6/N2 selectivity of over 40. Isosteric enthalpy of adsorption calculations and cyclic pressure-swing adsorption experiments showed that both CO2 and SF6 were physisorbed on ZIF-7–8. The adsorption of CO2 was also found to occur rapidly on all samples, with over 80% of the total uptake capacity being reached within 30 s. Detailed kinetics analysis concluded that the diffusion of CO2 and SF6 in the mixed-linker ZIF-7–8s were governed by a mixture of different mechanisms, including intracrystalline diffusion. The highly tunable sorption properties, uptake capacities and high gas selectivities of ZIF-7–8 render them as interesting candidate sorbents for certain greenhouse gases.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
Nyckelord
- Metal-organic frameworks
- MOFs
- Zeolitic imidazolate frameworks
- ZIFs
- Carbon capture
- Gas separation
- Engineering Science with specialization in Nanotechnology and Functional Materials
- Teknisk fysik med inriktning mot nanoteknologi och funktionella material
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)