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An experimental study for finding the best condition for PHI zeolite synthesis using Taguchi method for gas separation
Faculty of Chemical Engineering, Research and Technology Centre for Membrane Processes, Iran University of Science and Technology (IUST), Tehran, Iran.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
Faculty of Chemical Engineering, Research and Technology Centre for Membrane Processes, Iran University of Science and Technology (IUST), Tehran, Iran.
2018 (English)In: Chemical papers, ISSN 2585-7290, Vol. 72, no 5, p. 1139-1149Article in journal (Refereed) Published
Abstract [en]

Phillipsite zeolite particles and membranes were successfully synthesized at different operational and environmental conditions. Using an L9 orthogonal array of the Taguchi method, effects of experimental condition—synthesis temperature (130–150 °C), synthesis time (2–3 days), number of synthesized layers (1–3), and seeding suspension percentage—for membrane preparation with respect to CO2/CH4 ideal selectivity were investigated. The results showed that the ideal selectivity was improved up to 4.20 from 1.15 by increasing the number of synthesized layers, synthesis temperature, and seed solution concentration and by decreasing synthesis time. Moreover, the best synthesis conditions were defined based on the Taguchi method results and the membrane was synthesized with the highest ideal selectivity which was around 4.40. In addition, it was shown that T zeolite is formed beside PHI zeolite at low temperature even with long synthesis time.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 72, no 5, p. 1139-1149
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-67048DOI: 10.1007/s11696-017-0366-6ISI: 000430502800008OAI: oai:DiVA.org:ltu-67048DiVA, id: diva2:1167430
Note

Validerad;2018;Nivå 2;2018-04-26 (andbra)

Available from: 2017-12-18 Created: 2017-12-18 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 Chemical Process Engineering
Research subject
Chemical Technology
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, 10:30 (English)
Opponent
Supervisors
Available from: 2019-11-26 Created: 2019-11-26 Last updated: 2020-02-14Bibliographically approved

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