▎ 摘　　要

NOVELTY - Method for preparing small particle size cerium oxide involves (a) preparing graphene by hummer method to obtain graphene powder, and subjecting the graphene powder to high-speed ball milling, (b) placing the graphene in 25-28 wt.% aqueous ammonia solution, and performing ultrasonic oscillation of the cell disruptor, heating the ammonia solution, and performing refluxing treatment, (c) taking the cerium chloride stock solution and diluting it with water to 60-90 g/l rare earth oxide (REO) to prepare a cerium chloride solution, and slowly titrating into the aqueous solution in step (b), (d) heating the above solution to 30-35 degrees C, adding aqueous ammonia with a concentration of 7-8 mol/l and stirring continuously, (e) slowly adding solid ammonium bicarbonate, stop adding solid ammonium bicarbonate, and centrifuging and drying the precipitate, and (f) passing the off-white powder into the kiln for high-temperature calcination and temperature-programmed roasting. USE - The method is used for preparing small particle size cerium oxide. ADVANTAGE - The method improves the preparation efficiency of small particle size cerium oxide, and lays a raw material foundation for large-scale industrial applications, has high specific surface area and uniform particle size. DETAILED DESCRIPTION - Method for preparing small particle size cerium oxide involves (a) preparing graphene by hummer method to obtain graphene powder, and subjecting the graphene powder to high-speed ball milling, (b) placing the graphene in 25-28 wt.% aqueous ammonia solution, and performing ultrasonic oscillation of the cell disruptor, heating the ammonia solution at 80-90 degrees C, stopping ultrasonic oscillation and performing refluxing treatment at a constant temperature of 80-90 degrees C for 4-6 hours, after natural cooling, filtering once and diluting to obtain an aqueous solution of ammoniated graphene, where the pH of the aqueous solution is 8-8.5, and the concentration of the ammoniated graphene is 2-7 g/l, (c) taking the cerium chloride stock solution and diluting with water to 60-90 g/l rare earth oxide (REO) to prepare a cerium chloride solution, and slowly titrating into the aqueous solution in step (b), the temperature is normal temperature, the dripping amount is 150-200 ml/l, and the dripping time is 20-30 minutes, after finishing dripping, continuously stirring for 10-20 minutes, (d) heating the above solution to 30-35 degrees C, and the ratio of the REO mass (g) of the cerium chloride solution to the volume of ammonia (ml) is 1:1.5-2, adding aqueous ammonia with a concentration of 7-8 mol/l and stirring continuously, (e) after heating the solution obtained in step (d) to 45-55 degrees C, according to step (d), the REO mass (g) of the solution obtained and the mass (g) of solid ammonium bicarbonate are in a ratio of 1:0.7-1, while stirring, slowly adding solid ammonium bicarbonate while checking the pH value at 6-7, stop adding solid ammonium bicarbonate, and centrifuging and drying the precipitated precipitate to obtain an off-white solid powder for later use, and (f) passing the off-white powder into the kiln for high-temperature calcination and temperature-programmed roasting.