摘要
本文综述了共沉淀法、溶胶-凝胶法、水热法、高能球磨法等常用Ce_(x)Zr_(1-x)O_(2)储氧材料的合成方法,并进行了比较。阐述了Ce_(x)Zr_(1-x)O_(2)的基本改性机制,详述了稀土元素、碱土元素以及过渡金属对Ce_(x)Zr_(1-x)O_(2)的改性效果及原理。相关研究结果表明,Ce_(x)Zr_(1-x)O_(2)晶体结构、形貌、比表面积与其合成方法有很大关系,从而影响其储氧性能和热稳定性。通过掺杂第三种元素与Ce_(x)Zr_(1-x)O_(2)形成三元固溶体能进一步改善其储氧性能和热稳定性,从而使CO和HC在还原条件下以及NO_(x)在氧化条件下的转化率大大提高。最后,本文指出了Ce_(x)Zr_(1-x)O_(2)储氧材料目前存在的问题和今后的研究方向。
In this paper,the synthesis method of Ce_(x)Zr_(1-x)O_(2)oxygen storage materials has been summrised,including co-precipitation,sol-gel method,hydrothermal method,high energy ball-milling and some other methods.The comparisons of these preparation methods have been discussed.The basic modification mechanism of Ce_(x)Zr_(1-x)O_(2)has been described.Meanwhile,the modification effect and principle of rare earth elements,alkaline earth elements and transition metals on Ce_(x)Zr_(1-x)O_(2)has been elaborated.The relevant results showed that the crystal texture,morphology,BET surface area of Ce_(x)Zr_(1-x)O_(2)were significantly influenced by the synthetic method,which affected the oxygen storage capacity and thermal stability.By doping the third element with Ce_(x)Zr_(1-x)O_(2)to form ternary solid solution can further improve its oxygen storage performance and thermal stability,so that the ransformation rate of CO and HC under the reduction condition and NO_(x)under the oxidation condition has been greatly improved.Finally,the existing problems and future research directions of Ce_(x)Zr_(1-x)O_(2)oxygen storage materials has been pointed out.
作者
孟玲
Meng ling(BGRIMM Technology Group,Beijing 100160)
出处
《热喷涂技术》
2021年第2期85-94,共10页
Thermal Spray Technology