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

Q.C. Yuan, A. Hagen, F. Roessner

    Research output: Contribution to journalJournal articleResearchpeer-review

    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. (c) 2006 Elsevier B.V. All rights reserved.
    Original languageEnglish
    JournalApplied Catalysis A - General
    Volume303
    Issue number1
    Pages (from-to)81-87
    ISSN0926-860X
    DOIs
    Publication statusPublished - 2006

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