摘要
制备了CZ及CZ/AL,CZ/AS与CZ/AM(铈锆固溶体与氧化铝的复合氧化物),通过X射线衍射(XRD)、比表面(BET)、储放氧(OSC)和透射电镜(TEM)等手段对样品的晶相结构、比表面、储氧性能及微观结构等进行表征。结果表明:CZ/AL及CZ/AS都可形成单一稳定的立方晶型结构,氧化铝的掺杂可提高铈锆固溶体的比表面及耐高温稳定性,其中CZ/AS的比表面最高,CZ/AL储氧性能最大。此外,其复合机理表明,Al2O3与铈锆固溶体在纳米级别上的化学复合与纯粹的机械混合相比,前者具有更加稳定的晶型结构、更大的比表面和更好的储氧性能。
The CZ, CZ/AL, CZ/AS and CZ/AM were prepared by using pseudoboehmite and aqueous AI（NO3）3 ·9H20 as the A1203 sources with different ways of mixing, and characterized by Xray diffraction （XRD）, brunaueremmettteller （BET）, oxygen stor age capacity（OSC） and TEM analyses. It was showed that the doping of A1203 into CZ solid solution could increase the samples＇ specific surface area. thermalstability and oxygen storage capacity. The CZ, CZ/A1 and CZ/AS samples presented single cubic structure, CZ/AS showed the highest specific surface area and CZ/AL had the best oxygen storage capacity. It was also found that the samples of nanometerlevel between A1203 and （Ce, Zr）02, would show better thermal stability and higher OSC than those of samples with the micronlevel mixing.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2013年第2期222-227,共6页
Journal of the Chinese Society of Rare Earths
关键词
铈锆固溶体
氧化铝
铈锆铝
高温稳定性
储氧性能
稀土
ceria-zirconium solid solution
Al2 03
Ce-Zr-Al
thermal stability
oxygen storage capacity
rare earths
