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Structural Studies and Catalytic Activity of MCM-41 and MCM-48 Modified With the Titanocenophane [SiMe2(η5-C5H4)2]TiCl2

✍ Scribed by Paula Ferreira; Isabel S. Gonçalves; Fritz E. Kühn; Martyn Pillinger; João Rocha; Ana M. Santos; Alan Thursfield

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 389 KB
Volume: 2000
Category: Article
ISSN: 1434-1948
DOI: 10.1002/(sici)1099-0682(200003)2000:3<551::aid-ejic551>3.0.co;2-e

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✦ Synopsis

Solid-state NMR / Heterogeneous catalysis / Titanium / Titanocenes Titanium(IV)-grafted mesoporous silicas have been prepared by diffusion of an excess of the ansa-bridged titanocene [SiMe 2 (η 5 -C 5 H 4 ) 2 ]TiCl 2 into the channels of hexagonal MCM-41 and cubic MCM-48 in dichloromethane or tetrahydrofuran at room temperature. The choice of solvent determines the course of the reaction and hence the activity of the resulting materials as catalysts in the catalytic epoxidation of cyclooctene with tert-butylhydroperoxide. Magic-angle spinning (MAS) NMR ( 13 C, 29 Si) spectroscopy was used to characterise the local environment of the surface-bound titanium

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