In most cases, titanium dioxide has been
used only as a support for noble active metals or oxides in oxidation
reactions, but not as a catalyst [12–17]. Moreover, TiO2
was largely employed in photocatalytic oxidations of several compounds
[18–28]. For a more eco-friendly system it is desirable to develop a simple, highly active and reusable catalyst with the ability
to oxidise hydrocarbons under mild conditions. We demonstrate
here that TiO2 nanomaterials, such as TiO2 nanoparticles (NPs),
nanofibers (NFs) and nanotubes (NTs), are effective catalysts for the
selective allylic oxidation of different cycloalkenes and for the oxidation
of cyclohexane. These catalytic systems displayed very high
activity and selectivity in the solvent-free oxidation of cyclohexene,
1,5-cyclooctadiene, indane and cyclohexane using molecular
oxygen.
In most cases, titanium dioxide has beenused only as a support for noble active metals or oxides in oxidationreactions, but not as a catalyst [12–17]. Moreover, TiO2was largely employed in photocatalytic oxidations of several compounds[18–28]. For a more eco-friendly system it is desirable to develop a simple, highly active and reusable catalyst with the abilityto oxidise hydrocarbons under mild conditions. We demonstratehere that TiO2 nanomaterials, such as TiO2 nanoparticles (NPs),nanofibers (NFs) and nanotubes (NTs), are effective catalysts for theselective allylic oxidation of different cycloalkenes and for the oxidationof cyclohexane. These catalytic systems displayed very highactivity and selectivity in the solvent-free oxidation of cyclohexene,1,5-cyclooctadiene, indane and cyclohexane using molecularoxygen.
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