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Synthesis and characterization of zoned MFI films by seeded growth
Luleå tekniska universitet.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Chalmers University of Technology.
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2002 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 56, no 3, p. 291-302Article in journal (Refereed) Published
Abstract [en]

Supported zoned and sandwiched MFI films were prepared by a two-step crystallization procedure, using seeds. In this work, a zoned MFI film is defined as one assembled by crystals propagating from the support to the film top surface with varying Al content along the length of the crystal. A sandwiched MFI film is referred to as one assembled by at least two layers of crystals. Six types of films were prepared, both zoned and sandwiched, with a high or a low Al-content in the ZSM-5 part and with varying order of the layers, i.e. ZSM-5 coated with silicalite-1 or vice versa. The films were characterized by SEM and TEM. The Al-distribution was measured by cross-sectional EDS, and the preferred orientation of the crystals could be determined by XRD. Truly zoned films are obtained when the compositional difference between the layers is relatively small, and the synthesis conditions are similar or when the first layer is silicalite-1. If the first layer is ZSM-5 and the synthesis conditions and/or the composition vary too much, a discontinuity occurs at the interface between the layers, and sandwiched film results, where nucleation of the second layer is initiated by secondary nucleation or by applying seeds.

Place, publisher, year, edition, pages
2002. Vol. 56, no 3, p. 291-302
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-5597DOI: 10.1016/S1387-1811(02)00503-6Local ID: 3bcd97d0-6f83-11db-962b-000ea68e967bOAI: oai:DiVA.org:ltu-5597DiVA: diva2:978471
Note

Validerad; 2002; 20060929 (bajo)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-02-06Bibliographically approved

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  • apa
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