Nd修饰Ce_xZr_(1-x)O_2(x=0.8,0.6,0.2)固溶体的性能研究

Study on Performance of Ce_xZr_(1-x)O_2(x=0.8,0.6,0.2) Solid Solutions Modified with Nd

用共沉淀法制备了一系列550℃焙烧和1000℃老化的Nd修饰CexZr1-xO2(x=0.8,0.6,0.2)固溶体,并利用XRD和H2-TPR等方法进行表征。结果表明,不同的Ce/Zr比对Nd修饰CexZr1-xO2固溶体的晶相结构,还原性能及高温热稳定性有重要的影响。Nd修饰的CexZr1-xO2(x=0.8,0.6,0.2)均形成了CeO2-ZrO2-Nd2O3三元氧化物均相固溶体,并未出现Nd2O3单一氧化物的特征衍射峰,其中Ce0.8Zr0.15Nd0.05O2和Ce0.6Zr0.35Nd0.05O2为立方晶相,Ce0.2Zr0.75Nd0.05O2为四方晶相,且高温条件下,晶相结构稳定。Nd的掺杂使不同Ce/Zr比例CexZr1-xO2固溶体的还原性和高温热稳定性均明显增强,其中Ce0.6Zr0.35Nd0.05O2的还原性和热稳定性最强。

CexZr1-xO2（x=0.8,0.6,0.2） solid solutions modified with Nd were prapared by co- precipitation method, the samples calcined at 550℃ and aged at 1000℃ were characterized by XRD and H2 - TPR. The results indicate that the ratio of Ce/ Zr affects the crystal struettre, reduction properties and thermal stability of samples. The CexZr1-xO2（x=0.8,0.6,0.2） modified with Nd are solid solutions of CeO2 - ZrO2 - Nd2O3 ternary oxides, in which Ce0.8Zr0.15Nd0.05O2 and Ce0.6Zr0.35Nd0.05O2 are cubic crystal phase,and Ce0.2Zr0.75Nd0.05O2 is tetra crystal phase. The crystal phase structtre are stable at high temperature. The addition of Nd is beneficial to promote the reduction and thermal stability.