Preparation and Morphology of Pyramidal MFI Single-Crystal Segments
The Journal of Physical Chemistry B2007Vol. 111(48), pp. 13538–13543
Citations Over TimeTop 15% of 2007 papers
Wolfgang Schmidt, Ursula Wilczok, Claudia Weidenthaler, O. Medenbach, Richard Goddard, Gernot Buth, Alexander Cepak
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.
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