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Ultrathin Hydrophobic MFI Membranes
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.ORCID iD: 0000-0003-2459-7932
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
2014 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 192, p. 76-81Article in journal (Refereed) Published
Abstract [en]

Hydrophobic MFI membranes with a film thickness of less than 500 nm and a very low amount of defects were grown on α-alumina supports in fluoride media at near neutral pH (denoted TPAF-MFI membrane). These membranes are at least 4 times thinner than previous membranes prepared in fluoride media at near neutral pH; moreover, corresponding separation performance is the first time reported in this paper. For comparison, MFI membranes with a film thickness of about 500 nm were grown in hydroxide media at high pH (denoted TPAOH-MFI membrane). According to the permporometry results, the amount of defects in the TPAF-MFI membranes is about half of that in the TPAOH-MFI membranes, and most of the defects in both membranes are smaller than 1 nm. The membranes were evaluated for separation of a feed of 5 kPa n-butanol and 5kPa water, with 91 kPa helium as balance gas and 101 kPa helium as sweep gas. Both membranes displayed high permeance and the TPAF-MFI membrane was more selective to n-butanol than the TPAOH-MFI membrane. Interestingly, the total permeance and n-butanol/water separation factor increased to 11×10-7 mol/(m2 s Pa) and 19, respectively, after activation of the TPAF-MFI membrane at 300 ˚C in a helium flow saturated with n-butanol at 25 ˚C. The TPAF-MFI membrane also displayed a CO2/H2 separation factor of 6 at 25˚C and a CO2 permeance of 26×10-7 mol/(m2 s Pa) for a feed of 450 kPa CO2 and 450 kPa H2 and 101 kPa helium sweep gas.

Place, publisher, year, edition, pages
2014. Vol. 192, p. 76-81
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-5251DOI: 10.1016/j.micromeso.2013.09.017ISI: 000336713100013Scopus ID: 2-s2.0-84900488534Local ID: 34ea329a-6ebd-4c0b-93b8-fc81947234acOAI: oai:DiVA.org:ltu-5251DiVA, id: diva2:978125
Note
Validerad; 2014; Bibliografisk uppgift: Special issue devoted to the 6th International Zeolite Membrane Meeting; 20130911 (dankor)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Zhou, HanKorelskiy, DanilSjöberg, ErikHedlund, Jonas

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