Digitala Vetenskapliga Arkivet

Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Molecular sieve films and zoned materials
Luleå tekniska universitet.
2003 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Molecular sieve films and colloidal particles may have great potential for further utilization in novel technological sophisticated applications such as structured catalysts, sensors and membranes. The work presented in this thesis concerns the synthesis molecular sieve films and the crystallization of zoned MFI materials for novel catalyst and sensor applications. The seeding method developed at the division has been modified for the preparation of MFI and FAU type films on a variety of steel substrates ranging from ordinary carbon steel to highly corrosion resistant stainless steel. The films were characterized by SEM, XRD and gas adsorption techniques. The results revealed that the type of steel did not affect the film morphology, the thickness or the preferred orientation of the crystals, whereas the thermal stability was dependent on the steel. Films on various stainless steel supports were stable during calcination, whereas films on carbon steel supports peeled off upon rinsing after calcination because a relatively thick magnetite/hematite film formed. Pre-calination of carbon steel improved the zeolite film stability upon calcination. Zoned MFI materials (colloidal zoned MFI crystals and zoned films) were synthesized in this work in order to improve the catalytic performance of MFI. A two-step crystallization method was developed to prepare zoned MFI materials, in which precursor ZSM-5 colloidal particles or film were grown in a silicalite-1 synthesis solution directly or after acid treatment. It was shown that zoned MFI materials did not form when the ZSM-5 surface had a high aluminum content. In this case, polycrystalline aggregates or a sandwich film formed due to secondary nucleation. After reducing the aluminum content to half by acid treatment of ZSM-5, secondary nucleation of new silicalite-1 crystals was inhibited and zoned MFI material was obtained.

Ort, förlag, år, upplaga, sidor
Luleå: Luleå tekniska universitet, 2003. , s. 28
Serie
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757 ; 2003:37
Nationell ämneskategori
Kemiska processer
Forskningsämne
Kemisk teknologi
Identifikatorer
URN: urn:nbn:se:ltu:diva-26089Lokalt ID: c9511710-bdfa-11db-9be7-000ea68e967bOAI: oai:DiVA.org:ltu-26089DiVA, id: diva2:999248
Anmärkning
Godkänd; 2003; 20070216 (ysko)Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2021-02-11Bibliografiskt granskad

Open Access i DiVA

fulltext(1441 kB)187 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 1441 kBChecksumma SHA-512
d00368b4d9568c821b3bdd8a9a7bc4b7cffabd5dc893616b50a5b39e386e63e9dcce553d5e7bada18c03684dfe9bdaa91075ee7ee40f2cd859cc50b5d3f7c895
Typ fulltextMimetyp application/pdf

Av organisationen
Luleå tekniska universitet
Kemiska processer

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 188 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

urn-nbn

Altmetricpoäng

urn-nbn
Totalt: 189 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf