Ultrasonic disperse tungsten hexachloride in anhydrous n-butanol, wherein 150ml of anhydrous n-butanol is used for each gram of tungsten hexachloride, stop ultrasonication when the system changes from yellow to blue during the ultrasonic process, and then add Sodium nitrate, the amount of sodium nitrate is 1.5-3 times the quality of tungsten hexachloride, put the mixed system into the reactor, control the reaction temperature at 180-220°C, and control the reaction time at 6-12 hours; After cooling to room temperature, the obtained product was washed with water and ethanol, centrifuged and dried to obtain powdery white W18049. This method uses tungsten hexachloride and n-butanol as reactants, and the color of the reaction product white tungsten oxide (W18049) can be adjusted by controlling the amount of sodium nitrate added. When the mass ratio of sodium nitrate and tungsten hexachloride is 3:2 , can get white tungsten oxide W18049. Its advantages are: adding sodium nitrate to the system to modify the surface of tungsten oxide to obtain white tungsten oxide, which is obviously different from the white tungsten oxide W18049 obtained by the general solvothermal method in appearance and color; and the production is simple and easy.
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