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Development of b-oriented MFI membranes on graded alfa-alumina supports
2007 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Zeolites are microporos minerals that consist of aluminasilicates and are widely used commercially in different applications. They are used as components in detergents, for ion-exchange in water purification, and as molecular sieves which extract oxygen from air in a process involving the absorbing of atmospheric nitrogen. Potential future applications, like sensitive sensors and membranes for continuous molecular sieving, are exciting research fields over the world. Knowledge of properties of zeolite structures and synthesis is necessarily for further development of zeolite membranes. For zeolite membranes, high flux and a minimum amount of defects are desirable properties. A factor that affects these properties is the preferred orientation of the crystals in the membrane. Several techniques for manufacture of membranes with different orientation of the crystals have been reported. Interesting results have recently been reported by a group at University of Massachusetts, USA. Were one has grown a b-oriented MFI film with use of trimer-TPA3+ (Bis-N,N(tripropylammoniumhexamethylene)di-N,N propylammonium ion) as structure-directing agent. These membranes have high quality and shown high separation factor for xylene isomers. The division of Chemical Technology at LuleƄ University Technology has prepared very thin, weakly a-orineted MFI membranes on graded and masked supports. These membranes have very high flux. The aim of this work is to prepare b-oriented MFI films on graded and masked supports by combining the techniques developed at the two universities. These membranes could potentially have very high separation factors for xylene isomers and very high flux.

Place, publisher, year, edition, pages
2007.
Keyword [en]
Physics Chemistry Maths, Zeolites, membrane, crystal orientation, structure directing, agents
Keyword [sv]
Fysik, Kemi, Matematik
Identifiers
URN: urn:nbn:se:ltu:diva-51676ISRN: LTU-EX--07/032--SELocal ID: 8df9552a-17bd-4ca8-a908-32c2db0f7810OAI: oai:DiVA.org:ltu-51676DiVA: diva2:1025040
Subject / course
Student thesis, at least 30 credits
Educational program
Engineering Physics, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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