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Preparation, characterization and evaluation of silicalite-1 membranes with small crystal size
2003 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

It has been reported in the literature that the crystal size in zeolite membranes may affect the separation properties. A preparation procedure for the fabrication of silicalite-1 membranes with small crystal size was developed. These membranes were compared with membranes with larger crystal size. Membranes with small crystal size were prepared by repeated seeding followed by short hydrothermal treatment. Membranes with larger crystal size were prepared by seeding followed by a longer hydrothermal treatment. The membranes were characterized with single gas experiments and porosimetry. Scanning electron microscopy was used to determine the film thickness and morphology and x-ray diffraction patterns were recorded in order to indicate the crystal size and the orientation of the crystals in the films. Finally, separation experiments were performed on a selected membrane. It was found that the films prepared by three and four seedings and synthesis had high quality, similar to films with identical thickness but grown in one step. The amount of defects measured by porosimetry was similar for the two samples types. However, lower separation factors were obtained when testing the membranes with small crystal size by three isomer mixtures. It may thus be concluded: either there are defects in the multilayer films not detected by the porosimetry technique used or membranes with small crystals size results in lower separation factors.

Place, publisher, year, edition, pages
Keyword [en]
Technology, zeolite, MFI, membrane, small crystal size
Keyword [sv]
URN: urn:nbn:se:ltu:diva-55917ISRN: LTU-EX--03/176--SELocal ID: cb8d3cf1-2d0f-418a-83bf-80b815ec2536OAI: diva2:1029301
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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