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Synthesis and preparation of polyoxometalate H 4 [α -SiW 12 O 40 ]. n H 2 O with Zr as support at various weights of Zr 0.01g; 0.05 g; 0.25 g; 0.5 g; 0.75 g; 1 g and 1.25 g to form H 4 [ α - SiW 12 O 40 ]/Zr was conducted. The compounds from preparation were characterized using FTIR spectroscopy and crystallinity analysis using X-Ray diffraction. Thus H 4 [ α - SiW 12 O 40 ]/Zr was applied as catalyst for oxidation of cyclohexane to cyclohexanol and cyclohexanone. Oxidation process was studied through reaction time, hydrogen peroxide amount, temperature, and weight of catalyst. FTIR spectrum of H 4 [α -SiW 12 O 40 ]/Zr was appeared at wavenumber 771.53-979.84 cm -1 and Zr at 486.06-1481.33 cm -1 . Diffraction pattern of H 4 [ α -SiW 12 O 40 ]/Zr showed that high crystallinity was identified at 2 θ 8 o -10 o and 28.3 o . Based on FTIR spectrum and XRD powder pattern, the optimum preparation of H 4 [ α -SiW 12 O 40 ]/Zr was obtained using 0.5 g of Zr. The catalytic study of cyclohexane using H 4 [α -SiW 12 O 40 ]/Zr at 0.5 g of Zr resulted conversion about 99.73%. Catalyst can convert cyclohexane with the highest conversion then used for further deep catalytic investigation. Optimization of oxidation process resulted optimum reaction time at 2 h, 3 mL of hydrogen peroxide amount, 80 o C of temperature, and 0.038 g of catalyst. The GCMS analysis indicated the oxidation of cyclohexane using H 4 [α -SiW 12 O 40 ]/Zr at 0.5 g of Zr formed cyclohexanol and cyclohexanone with selectivity 18.77 and 23.57, respectively.

Oxidation Of Cyclohexane To Cyclohexanol And Cyclohexanone Using H4[α-SiW12O40]/Zr As Catalyst