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Polycrystalline films of epitaxial MFI overgrowths
Luleå tekniska universitet.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
ExxonMobil Chemical Europe Inc..
2006 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 97, no 1-3, p. 27-33Article in journal (Refereed) Published
Abstract [en]

Films of epitaxial MFI overgrowths, i.e. ZSM-5 films covered with silicalite-1, with crystals extending from the substrate to the top surface, were synthesized using a seeding method with acid leaching between the synthesis of the MFI layers. The films were characterized by SEM, TEM, XRD and XPS. When acid leaching was omitted, secondary nucleation of silicalite-1 on the ZSM-5 film resulted in a sandwich film with discontinuous crystals. When the precursor ZSM-5 film was acid leached and the surface Si/Al ratio increased from 23 to 47, the crystals in the precursor film grew epitaxially upon treatment in a silicalite-1 synthesis mixture. It was thus revealed that reduction of the aluminum content at the external surface of ZSM-5 may be important for the successful synthesis of epitaxial MFI overgrowths. Alternatively, acid leaching may provide a cleaner surface, and facilitate epitaxial growth.

Place, publisher, year, edition, pages
2006. Vol. 97, no 1-3, p. 27-33
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-8044DOI: 10.1016/j.micromeso.2006.06.030ISI: 000243233500004Scopus ID: 2-s2.0-33751310596Local ID: 67c3c650-a24c-11dc-ac39-000ea68e967bOAI: oai:DiVA.org:ltu-8044DiVA, id: diva2:980934
Note
Validerad; 2006; 20071204 (pirkko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Hedlund, Jonas

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