固相反应-结构导向法合成铈锆固溶体

Preparation of Ceria-zirconia Solid Solution by Solid-state Reaction-Surfactant Templating Coupling Method

为获得结构和性能优化的铈锆固溶体,将固相反应-结构导向法引入制备过程,分别考察了NaOH添加量、铈锆比、晶化温度、晶化时间和表面活性剂加量等因素对固溶体结构的影响.结果表明,采用固相反应-结构导向法可以得到比表面较大的四方相铈锆固溶体,但其热稳定性还有待于进一步改善.OH-/Zr是影响固溶体结构的主导因素,它不仅影响着比表面的大小,还控制着晶相转化过程.

The solid-state reaction coupled with surfactant directing method was firstly introduced into the synthesis of ceria-zirconia solid solution. The synthesis parameters, such as OH/Zr ratio, Ce/Zr ratio, crystallization temperature and amount of surfactant et al. , were systematically investigated. The results showed that larger specific surface area of ceria zirconia solid solution with tetragonal phase could be exhibited by optimizing the synthesis parameters. Of pity is that the thermal stability should be improved. The ratio of OH^-/Zr is the main factor to affect the structure of solid solution. It not only controls the surface area, but also decides the process of crystal phase transformation.