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Title: Characterization of nanosized material extracted from clear suspensions for MFI zeolite synthesis
Authors: Ravishankar, Raman ×
Kirschhock, Christine
Knops-Gerrits, PP
Feijen, EJP
Grobet, Pierre
Vanoppen, P
De Schryver, Frans
Miehe, G
Fuess, H
Schoeman, BJ
Jacobs, Pierre
Martens, Johan #
Issue Date: 1999
Publisher: AMER CHEMICAL SOC
Series Title: Journal of Physical Chemistry B vol:103 issue:24 pages:4960-4964
Conference: date:Katholieke Univ Leuven, Ctr Oppervlaktechem Katalyse, B-3001 Heverlee, Belgium; Katholieke Univ Leuven, Lab Mol Dynam & Spect, B-3001 Heverlee, Belgium; Tech Univ Darmstadt, Div Struct Res, Dept Mat Sci, Darmstadt, Germany; Lulea Univ Technol, Dept Chem Technol, S-95187 Lulea, Sweden
Abstract: The silica species contained in an aged clear suspension, which upon heating gives rise to the crystallization of Silicalite-l, were extracted with 80% efficiency using a sequence of acidification, salting out, phase transfer into organic solvent, and freeze-drying methods. This silica powder was characterized by X-ray scattering, transmission electron microscopy, atomic force microscopy, and Si-29 magic angle spinning nuclear magnetic resonance. These techniques gave evidence for the presence of a very specific morphology, corresponding to slab shaped particles, with dimensions of 1.3 x 4.0 x 3.0 nm. The nanoslabs have the MFI structure with nine channel intersections per particle, each containing a TPA cation. The identity of the extracted nanoslabs with the species in suspension is evidenced with in situ and ex situ X-ray scattering.
ISSN: 1089-5647
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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