Synthesis and characterisation of titanosilicates used as catalysts for the epoxidation of cyclohexene
Tóm tắt
In this work the synthesis of TS-1 from a titanosilicate cogel precursor is reported. The synthesis parameters were altered to optimise both the cogel and resultant framework material. The titanosilicate materials were characterised using a range of techniques including EDX analysis, XRD, 29Si NMR, IR, UV-vis and SEM. Those materials which demonstrated the most catalytic potential were used as catalysts for the epoxidation of cyclohexene reaction, in which the use of aqueous H2O2 and a urea-H2O2 adduct were compared. It was shown that the cogel precursors themselves exhibited some catalytic reactivity and selectivity for all of the catalysis reactions exploited. However the TS-1 materials were more catalytically active, which highlighted the need of the ordered framework for the most effective catalysis. The TS-1 materials prepared from the cogel precursors exhibited similar catalytic ability to those analogous standard materials prepared via conventional processes. Thus TS-1 preparation by the cogel route was shown to be a viable alternative preparation method to the conventional process.
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