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Preparation and Morphology of Pyramidal MFI Single-Crystal Segments

MPS-Authors
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Schmidt,  Wolfgang
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Wilczok,  Ursula
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Weidenthaler,  Claudia
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Goddard,  Richard
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Cepak,  Alexander
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Schmidt, W., Wilczok, U., Weidenthaler, C., Medenbach, O., Goddard, R., Buth, G., et al. (2007). Preparation and Morphology of Pyramidal MFI Single-Crystal Segments. The Journal of Physical Chemistry B, 111(48), 13538-13543. doi:10.1021/jp075934p.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-9113-6
Abstract
Single-crystal segments of tetra-n-propylammonium-templated Silicalite-1 and ZSM-5 were prepared by postsynthetic treatment of twinned MFI prisms. Microwave irradiation of the parent crystallites in alkaline solution containing hydrogen peroxide, followed by ultrasound treatment, led to disintegration of the zeolite prisms. The resulting wedge-shaped crystal segments proved to be single crystals of excellent crystallinity as shown by optical and X-ray investigations. The hydroxyl ions, compensating the positive charges of the tetrapropylammonium cations, were located by single-crystal structure refinement in template-containing Silicalite-1 and ZSM-5 but absent from the calcined samples.