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Physicochemical characterization of silicalite-1 nanophase material
Centrum Oppervlaktechemie en Katalyse.
Centrum Oppervlaktechemie en Katalyse.
Luleå tekniska universitet.
Laboratorium Moleculaire Dynamica en Spectroscopie.
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1998 (Swedish)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 102, no 15, p. 2633-2639Article in journal (Refereed) Published
Abstract [en]

A silicalite-1 nanophase material with an elementary particle size of 18-100 nm is synthesized from clear solution and isolated and purified using supercentrifugation. The nanopowder is characterized in detail using scanning electron microscopy, high-resolution transmission electron microscopy, attenuated force microscopy, 29Si magic angle spinning NMR, 13C cross polarization magic angle spinning NMR, X-ray diffraction, dinitrogen physisorption, and thermogravimetric analysis and compared with micrometer-sized silicalite-1. The nanosized and micrometer-sized materials have many common properties including the refined structure and the nature and concentrations of tetrapropylammonium species incorporated during the synthesis. Unique properties of the nanophase are a splitting of the characteristic framework vibration at 550 cm-1 into a doublet at 555 and 570 cm-1, a high concentration of defect sites, and a strain in the crystallites along the "a" crystallographic direction. The nanophase exhibits a two-stage dinitrogen physisorption in the low-pressure region, ascribed to adsorptions in micropores created by the stacking of the nanoparticles in addition to adsorptions in the intracrystalline micropores.

Place, publisher, year, edition, pages
1998. Vol. 102, no 15, p. 2633-2639
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-7060DOI: 10.1021/jp973147uISI: 000073271100005Local ID: 55f97e20-0fcd-11de-b3bc-000ea68e967bOAI: oai:DiVA.org:ltu-7060DiVA, id: diva2:979947
Note
Godkänd; 1998; 20090313 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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