Study On The Synthesis And Catalytic Oxidation Performance Of Series Of Molybdovanadophosphoric Heteropoly Compounds

Molybdovanadophosphoric heteropoly compounds are sorts of replaced heteropoly compounds. A series of (NH₄)_n+3PMo_12-nV_nO₄₀ were synthesized and characterized, the catalytic behavior of the heteropoly compounds was studied. The results show that (NH₄)_n+3PMo_12-nV_nO₄₀ have better catalytic oxidation property: faster reaction rate, lower reaction temperature, higher selectivity of products and easy regeneration in the reaction.1 Synthesis and characterization of (NH₄)_n+3PMo_12-nV_nO₄₀A series of (NH₄)_n+3PMo_12-nV_nO₄₀ were synthesized using (NH₄)₂HPO₄, (NH₄)₆Mo₇O₂₄ and NH₄VO₃ as material by a optimum method. TG-DSC, IR, UV, CV and XRD confirmed the synthesized products. The results show that the series of heteropoly compounds have Keggin structure.2 Catalytic oxidation of ethylbenzene by (NH₄)_n+3PMo_12-nV_nO₄₀Oxidation of ethylbenzene was catalyzed by (NH₄)_n+3PMo_12-nV_nO₄₀ using H₂O₂ as oxidant in acetic acid solvent. The conversion of ethylbenzene was 82. 0% and the selectivity of acetophenone was 100% at optimum condition of 343K, reacting for 4h.3 Catalytic oxidation of cyclohexene by ((NH₄)_n+3PMo_12-nV_nO₄₀Oxidation of cyclohexene was catalyzed by (NH₄)_n+3PMo_12-nV_nO₄₀ using H₂O₂ as oxidant in acetone solvent. The conversion of cyclohexene was 80.8% and the selectivity of cyclohexene-2-one was 59.7% at the optimum condition of 333K, reacting for 6h. The conversion of material increased when reaction time was prolonged.