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Synthesis and characterization of FAU membranes
2006 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Zeolites are crystalline aluminosilicates with molecular sieving properties and are commonly used in applications such as catalysis, adsorbtion or ion exchange. Zeolite membranes are industrially interesting due to the ability to separate chemical compounds in continuous processes under severe conditions. Zeolite membranes have well-defined pore size suitable for many applications and high thermal and chemical stability. Zeolite membranes must be thin in order to obtain a high flux and defect-free to achieve high selectivity. In this work, zeolite membranes of FAU type were prepared. The hydrophilic behavior of this kind of zeolites is used to separate polar compounds by preferential adsorption. FAU-type films with a thickness of 0.5 ┬Ám was grown on porous alumina using a seeding method. No organic template molecules were used during the synthesis of the membranes, avoiding the calcination procedure that can induce the formation of cracks. The membranes were characterized with scanning electron microscopy, x-ray diffraction, porosimetry and separation experiments. The objective of this work is to obtain thin and virtually defect-free films by using a clear synthesis solution. The synthesis conditions were modified to study its influence on the separation performance of the membranes. Single and dual seeding procedures were investigated in order to obtain a dense seeded surface. It was found that a single seeding was sufficient to obtain a dense layer of seeds. The influence of the synthesis solution composition on the quality and growth of the FAU films was also investigated. The thermal stability of FAU membranes was studied. It was demonstrated that high drying temperatures do not reduce the membrane quality. Several rinsing procedures for the prepared membranes were also investigated. It was found that a larger amount of defects formed during longer time of rinsing procedures. The CO2 selectivity of binary CO2/CH4 mixtures was also improved by ion exchanging the zeolite films with K+ ions. Confidential until 2010-08-08

Place, publisher, year, edition, pages
2006.
Keyword [en]
Physics Chemistry Maths
Keyword [sv]
Fysik, Kemi, Matematik
Identifiers
URN: urn:nbn:se:ltu:diva-49408ISRN: LTU-EX--06/287--SELocal ID: 6bf705fd-9d5c-4800-9cbb-ec7614722f6bOAI: oai:DiVA.org:ltu-49408DiVA, id: diva2:1022755
Subject / course
Student thesis, at least 30 credits
Educational program
Chemical Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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