A series of four PdO/SBA-15 catalysts with 1, 2, 4, 5% (by weight) loading of PdO have been prepared by a conventional impregnation method and are characterized by N 2 -adsorption, low-angle and wideangle XRD, XPS and TEM techniques. The catalysts exhibited very high conversion of cyclohexene and high selectivity of cyclohexenone with 70% t-BuOOH in CH 3 CN. The structural and textural characteristics of catalysts play a crucial role in high conversion and selectivity.

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The molecular designed dispersion method yielded monodispersed nanoscale (4–7.5 nm sized) V2O5 dimeric species on SBA-15, which oxidized TMP into TMBQ with H2O2 under green conditions.