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An investigation into the Ti-grafting structure on MCM-41 and epoxidation catalysis

Paper ID Volume ID Publish Year Pages File Format Full-Text
44534 46038 2006 7 PDF Available
Title
An investigation into the Ti-grafting structure on MCM-41 and epoxidation catalysis
Abstract

The structure of titanium species grafted on a purely siliceous MCM-41 and their catalysis in the epoxidation of cyclohexene with tert-butyl hydroperoxide (TBHP) were investigated. FT-IR, XANES and UV–vis were used for the examination of the Ti-grafted MCM-41. The results indicated that the titanium atoms are grafted on the wall surface of the MCM-41 by four-fold coordination. The four-fold coordinated titanium species are mainly grafted by two or one –O–Si–O– bridges on the MCM-41, resulting in so-called bipodal or monopodal titanium centres in partially polymerised states. The ratio of monopodal to bipodal titanium increases with the increase in Ti-content. These partially polymerised titanium species considered as catalytic active centres have high activity and selectivity in the epoxidation reaction. The used Ti-grafted MCM-41 samples were regenerated by heating in nitrogen or air atmosphere. The regeneration in nitrogen atmosphere gives samples with significantly higher catalytic activity than in air.

Keywords
Ti-grafted MCM-41 structure; Ti-content; UV–vis; Epoxidation; Regeneration
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An investigation into the Ti-grafting structure on MCM-41 and epoxidation catalysis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 303, Issue 1, 18 April 2006, Pages 81–87
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
Any Questions? feel free to contact us