Preparation of α-MoO₃ from H₃PMo₁₂O₄₀ precursor: synthesis of 1,2-cyclohexanediol from cyclohexene over α-MoO₃-TiO₂ catalyst

Abstract A series of α -MoO 3 -TiO 2 mixed oxides were prepared by calcining a mixture the heteropolyacid H PMo 12 O 40 and TiO at temperatures ranging from 350 °C to 600 °C. The thus characterized tested for oxidation cyclohexene oxidizing /CO . FTIR XRD characterizations showed that Keggin structure was preserved calcination below 400 Above 450 °C, Keggin’s collapses. analysis revealed as temperature increased, more orthorhombic formed. Analysis reaction GC-MS leads 1,2-cyclohexanediol main product 2-cyclohexene-1-one 2-cyclohexene-1-ol minor products. Oxidation proved be effective than alone CO alone. conversion (69.4%) selectivity (93.2%) obtained over oxides, higher with monoxide monoxide, suggest synergistic effect between This efficient stable catalyst after reuse can developed synthesis diols.