溶胶-凝胶法制备氧化铈粉体及其对晶粒度的影响

The Preparation of CeO_2 Powder and the Effect on Grain Size

实验采用以柠檬酸为配体的溶胶-凝胶法制备二氧化铈粉体,并研究了硝酸铈和柠檬酸的配比、硝酸铈浓度、成胶温度、焙烧温度及时间对其成胶时间及晶粒度的影响。结果表明:在硝酸铈与柠檬酸的物质的量之比为1∶2、Ce(NO3)3的物质的量浓度为0.5 mol/L、成胶温度60℃、成胶时间16 h,500℃下焙烧3 h的条件下,可制备晶粒度为22.5 nm的二氧化铈粉体。

The CeO2 powder has been prepared by sol-gel method with citric acid. The influence factors of sol reaction time and grain size had been discussed, such as the ratio between cerium nitrate and citric acid, the concentration of cerium nitrate, reaction temperature, calcination temperature and calcination time. The results show that the CeO2 powder with grain size of 22.5 nm could be prepared in the condition that the ratio between cerium nitrate and citric acid is 1 ： 2, the concentration of Ce（NO3）3 is 0.5 mol/L, the reaction temperature is 60 ℃, calcination temperature is 500 ℃ and calcination time is 3 hours.