超细氧化铈制备工艺研究

针对传统的沉淀法制备氧化铈工艺,研究了以Ce Cl3溶液为原料的超声喷雾热解法制备超细Ce O2短流程工艺路线.通过TG-DTA实验研究Ce Cl3·7H2O的热分解过程,利用XRD,SEM和TEM表征了沉淀法和喷雾热解法制得的样品,最后从产品、流程及资源综合利用等方面对两种工艺进行对比分析.结果表明:Ce Cl3·7H2O在25~233℃为脱水反应,热分解温度为500℃,高于583℃热分解完全;在600℃时超声喷雾热解法制备的Ce O2分散性好、形貌规则,粒度主要分布在0.11~0.80μm,沉淀法制备的Ce O2有团聚现象且形貌不规则.超声喷雾热解法是一种流程短、资源综合利用高且产品形貌规则的清洁工艺技术.

Study on the Preparation Process for CeO2 Superfine Powder

Compared with traditional precipitation process， a short process for preparation of CeO₂ superfine powder was investigated by ultrasonic spray pyrolysis using CeCl₃ solution as raw materials. The thermal decomposition process of CeCl₃·7H₂O was examined by TG-DTA experiments. CeO₂ was prepared by the precipitation and spray pyrolysis method respectively at 600℃， which was characterized by XRD， SEM and TEM. The two methods were compared in terms of products， processes and the resource comprehensive utilization. The results showed that the reaction of CeCl₃·7H₂O at 25~233℃ was a dehydration reaction， the thermal decomposition start temperature was 500℃ and end temperature was 583℃. The product synthesized via ultrasonic spray pyrolysis has good dispersion， regular morphology and the particle size distribution between 0.11~0.80μm， while the morphologies of the products obtained by precipitation process was not regular and agglomerate was also observed. Obviously， ultrasonic spray pyrolysis method is a clean technology with short process， high level resource comprehensive utilization and controllable product morphologies.