摘要
总结汽车行业普遍使用的SEM+EDS不能应对汽车尾气催化剂类样品的原因主要是EDS的灵敏度和分辨率相对不足,而微束分析仪器电子探针EPMA在这两方面具有明显的优势,可满足催化剂中微量的贵金属和稀土元素的分布表征。测试某商用尾气催化剂,结果表明:其外层含Rh、廉价金属热稳定剂、CeO2储氧剂和对气体吸附性较高的ZrO2;内层含贵金属成分为Pd、热稳定助剂以及增强储氧能力的ZrO2-CeO2,以及一些增大比表面积、提高颗粒分散性和热稳定性的其他添加元素,显示了EPMA在微区分析表征中涉及微量及稀土元素时有着强大的分析能力。
The reason that SEM+EDS, which was widely used in automobile industry, could not meet requirements of automobile exhaust catalyst samples was mainly due to the relative inadequacy of sensitivity and resolution.EPMA, a microbeam analyzer, had obvious advantages in these two aspects, which could meet the needs of analysis of trace precious metals and rare earth elements in catalysts.A commercial exhaust catalyst was tested. The results show that its outer layer contains Rh, cheap metal heat stabilizer, CeO 2 oxygen storage agent and ZrO 2 with high gas adsorption capacity;the inner layer contains Pd, heat stabilizer and ZrO2-CeO 2 with enhanced oxygen storage capacity;and some elements which increases surface area, particles dispersion and thermal stability. It can be concluded that EPMA has a strong analytical ability when it involves trace and rare earth elements in microanalysis and characterization.
作者
赵同新
崔会杰
胡晓春
ZHAO Tongxin;CUI Huijie;HU Xiaochun(Analytical Applications Center,Shanghai Branch,SHIMADZU(China)Co.,Ltd.,Shanghai 200233,China;Analytical Applications Center,Beijing Branch,SHIMADZU(China)Co.,Ltd.,Beijing 100020,China)
出处
《汽车零部件》
2019年第8期62-66,共5页
Automobile Parts
