Preparation and morphology of pyramidal MFI single-crystal segments

被引：35

作者：

Schmidt, Wolfgang

Wilczok, Ursula

Weidenthaler, Claudia

Medenbach, Olaf

Goddard, Richard

Buth, Gernot

Cepak, Alexander

机构：

[1] Max Planck Inst Kohlenforsch, D-45470 Mulheim, Germany

[2] Ruhr Univ Bochum, Inst Geol Minerol & Geophys, D-44780 Bochum, Germany

[3] Forschungszentrum Karlsruhe, ISS, D-76021 Karlsruhe, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2007年 / 111卷 / 48期

关键词：

D O I：

10.1021/jp075934p

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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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页码：13538 / 13543

页数：6

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