Selective catalytic oxidations of cyclohexene, thioether and geraniol with hydrogen peroxide. Sensitivity to the structure of mesoporous niobosilicates

• Synthesis and characterization of SBA-15 and FDU-1 containing niobium.
• Design of heterogeneous catalysts for green oxidation with hydrogen peroxide.
• Effect of matrix type, Nb source and location on the catalytic activity.

Catalytic properties of niobosilicates were tested in the oxidation reactions with aqueous H2O2 using cyclohexene, methyl phenyl sulphide and geraniol as model substrates. The catalytic performance of niobosilicates was found sensitive to the type of matrix, niobium source and location of niobium. Structural and textural parameters of the materials synthesized and the location of niobium were monitored during the catalytic reactions. Different catalytic activities of the catalysts prepared with different niobium precursors were related to different location of niobium in the matrix. Highly ordered, 3D caged cubic mesoporous silicates containing niobium, NbFDU-1, and 2D hexagonal mesoporous niobosilicates, NbSBA-15, showed good activities and selectivities.

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