Direct Oxidation of Cyclohexanol to Cyclohexanone Catalyzed by WO_3

Synthesis of cyclohexanone by WO3 catalytic oxidation cyclohexanol with 30 % H2O2 can be performed with higher yields by using methanol as solvent without acidic ligand and phase-transfer catalyst.The yield of cyclohexanone reaches 88.0 % Under the condition of 1 mmol WO3,5mL methanol,1∶100∶150 mole ratio of(WO3) ∶(C6H11OH)∶(H2O2)and at the temperature of 90 ℃ and 3 h reaction time.Having used WO3 as catalyst for 5 times,the yield of cyclohexanone is still above 80 %.The result of FTIR analysis shows that the structure of the recycling WO3 catalyst is structurally stable and repeatedly useable.