V-Mo-O Catalyst Preparation and Catalytic Oxidation of Toluene to Benzaldehyde

A competitive benzaldehyde synthetic route was catalytic selective oxidation of toluene under mild conditions. Assessed V-Mo-O catalyst performance of selective catalytic oxidation of toluene under mild conditions,c atalysts were prepared by the sol-gel method. The results showed that the molar ratio of vanadium molybdenum and calcination temperature had significant effects on the catalyst performance,When the molar ratio of vanadium molybdenum was 6∶ 7,and the calcination temperature was 500 ℃,catalyst performance was the best. The results of SEM showed that Catalyst was rod structure,the diameter was about 700 nm,the length was about 6 μm,and the Mo6V9O40and MoO3phase was observed. The results of XPS showed that the catalyst had MoO3,the different l ayers assembled with different oxidation state of Mo may contribute to the transmission of oxygen species,which led catalytic performance was improved. When the reaction temperature was 80 ℃,hydrogen peroxide was as the o xidant,ice acetic acid was as the solvent,The reaction time was 30 min,the conversion of toluene was 38. 9%, the selectivity of benzaldehyde was 69. 7%.