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Highly Structured Nanofiber Zeolite Materials for Biogas Upgrading
Department of Environmental Engineering, Technical University of Denmark, Lyngby, Denmark.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Department of Energy Conversion and Storage, Technical University of Denmark, Roskilde, Denmark.
Department of Energy Conversion and Storage, Technical University of Denmark, Roskilde, Denmark.
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2020 (English)In: Energy Technology, E-ISSN 2194-4296, Vol. 8, no 1, article id 1900781Article in journal (Refereed) Published
Abstract [en]

Hierarchical zeolite composite nanofibers are designed using an electrospinning technique with post‐carbonization processing to form mechanically strong pellets for biogas upgrading. A ZSM‐5 nanopowder (zeolite) and a polyvinylpyrrolidone (PVP) polymer are electrospun to form ZSM/PVP composite nanofibers, which are transformed into a ZSM and carbon composite nanofiber (ZSM/C) by a two‐step heat treatment. The ZSM/C nanofibers show a 30.4% increase in Brunauer–Emmett–Teller (BET) surface area compared with the non‐structured ZSM‐5 nanopowder. Using ideal adsorbed solution theory, CO2‐over‐CH4 selectivity of 20 and CO2 uptake of 2.15 mmolg−1 at 293 K at 1 bar for ZSM/C nanofibers are obtained. For the efficient use of adsorbents in pressure swing adsorption operation, the nanofibers are structured into ZSM/C pellets that offer a maximum tensile strength of 6.46 MPa to withstand pressure swings. In the breakthrough tests, the CO2 uptake of the pellets reach 3.18 mmolg−1 at 293 K at 4 bar after 5 breakthrough adsorption–desorption cycles, with a much higher mass transfer coefficient of 1.24 ms−1 and CO2 uptake rate of 2.4 mg of CO2 g−1s−1, as compared with other structured zeolite adsorbents.

Place, publisher, year, edition, pages
John Wiley & Sons, 2020. Vol. 8, no 1, article id 1900781
Keywords [en]
adsorbent materials, biogas upgrading, electrospinning, zeolites
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-76434DOI: 10.1002/ente.201900781ISI: 000488168800001OAI: oai:DiVA.org:ltu-76434DiVA, id: diva2:1362283
Note

Validerad;2020;Nivå 2;2020-01-28 (johcin)

Available from: 2019-10-18 Created: 2019-10-18 Last updated: 2020-01-28Bibliographically approved

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Narang, KritikaAkhtar, Farid

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