V-Mo-O /γ-Fe_2O_3 magnetic catalyst preparation and catalytic oxidation of toluene to formaldehyde

The magnetic catalysts possessed obvious advantages in the process of reaction and separation, adding the magnetic nucleus into the catalysts to preparation of the V-Mo-O / γ-Fe2O3 magnetic catalysts,by the sol-gel method. The characteristic of catalysts was analyzed by modern technology. The results showed that the structure of the catalysts were not affected by the magnetic nucleus and the calcination temperature had a significant influence on the catalytic performance,the most suitable calcination temperature was 500 ℃,Catalyst was fibrous structure,and the Mo6V9O40 and MoO3phase in the catalyst was observed through X-ray diffraction. When the reaction temperature was 80 ℃,hydrogen peroxide was as the oxidant,ice acetic acid was as the solvent,the conversion rate of toluene was 38. 9%,the selectivity of benzaldehyde was 69. 7%.