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Selective blocking of grain boundary defects in high-flux zeolite membranes by cokin
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-2459-7932
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, Chemical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
2017 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 5, no 16, p. 7295-7299Article in journal (Refereed) Published
Abstract [en]

Commercial application of zeolite membranes has been hindered by the challenge of preparing defect-free membranes. Herein, we report a facile method able to selectively plug grain boundary defects in high-flux MFI zeolite membranes by coking of iso-propanol at 350 °C. After modification, the permeance via defects was reduced by 70%, whereas that via zeolite pores was reduced by only 10%.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017. Vol. 5, no 16, p. 7295-7299
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-62738DOI: 10.1039/C7TA01268CISI: 000399390300006Scopus ID: 2-s2.0-85017599078OAI: oai:DiVA.org:ltu-62738DiVA, id: diva2:1085205
Note

Validerad; 2017; Nivå 2; 2017-04-25 (andbra)

Available from: 2017-03-28 Created: 2017-03-28 Last updated: 2019-11-26Bibliographically approved
In thesis
1. Defects in Zeolite Catalysts and Membranes
Open this publication in new window or tab >>Defects in Zeolite Catalysts and Membranes
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

ZSM-5 is one of the most well-known zeolites. It has been synthesized for many different applications, including as catalyst for catalytic reactions and as a membrane in separation processes.  The main goal of this thesis is to investigate and characterize the defects in crystal and film growth of ZSM-5 for modification purposes.

Primarily, ZSM-5 crystals with carefully controlled thickness were synthesized in fluoride and hydroxide media. These synthesized catalysts were then characterized and the two synthesis routes were compared with each other in terms of stability. Then, in the synthesized catalysts, the role of defects during reaction was investigated. Furthermore, the growth of ZSM-5 nanocrystals and subsequent film formation was investigated to better understand how particles formed in synthesis solution (a hydrolyzed mixture of H2O-TEOS-TPAOH), followed by how these crystals interact to form a zeolite film. Finally, pre- and post-production modification of ZSM-5 and PHI membranes was investigated. Since, the roughness surface of the support could play a crucial role in having an even film, it was done as a pre-treatment technique for membrane synthesis. Additionally, a technique was developed in an attempt to plug the defects of grain boundaries to increase the membrane performance.

 

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2020
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Chemical Engineering
Identifiers
urn:nbn:se:ltu:diva-76870 (URN)978-91-7790-506-6 (ISBN)978-91-7790-507-3 (ISBN)
Public defence
2020-02-19, F1031, Luleå, 14:20 (English)
Opponent
Supervisors
Available from: 2019-11-26 Created: 2019-11-26 Last updated: 2020-01-21Bibliographically approved

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Korelskiy, DanilYe, PengchengNabavi, Mohammad SadeghHedlund, Jonas

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