The effect of silylation on titanium-containing silica catalysts for the epoxidation of functionalised molecules
Articolo
Data di Pubblicazione:
2008
Abstract:
The epoxidation of functionalised substrates of interest as fine chemicals using mesoporous titanium-containing silicas is here
reported and the role of silylation in changing the surface hydrophilic character of these catalysts is investigated. The silylation procedure
was carried out on two titanium-grafted silicas with different morphologies. An ordered MCM-41 and a non-ordered commercial mesoporous
silica were used as supports. The reactivity of bulky substrates with different characteristics (limonene, a-terpineol, carveol and
methyl linoleate) is studied and compared. The effect of silylation is more pronounced on Ti–MCM-41 than with low-surface area Ti–
SiO2 and it is shown that the catalytic performances are strongly dependent on the nature of the reactant. Purely alkenic molecules show
better reactivity over silylated catalysts than over non-silylated ones. On the other hand, a hydrophilic environment around the titanium
active sites has often a beneficial effect in the epoxidation of richly functionalised substrates.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Silylation, Heterogeneous epoxidation catalysts, Hydrophobicity, Hydrophilicity, Titanium, Silica, Unsaturated terpenes, Methyl linoleate
Elenco autori:
M. Guidotti; I. Batonneau-Gener; E. Gianotti ; L. Marchese; S. Mignard; R. Psaro; M. Sgobba; N. Ravasio
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