水热法合成棒束状纳米CeO_2粉体及其催化性能

Hydrothermal Method Synthesization and Catalytic Performance of Cluster-like CeO_2 Nano-powders

在醇-水体系中以P123为模板、硝酸铈和草酸为原料,利用水热法制备了棒束状纳米CeO2粉体,研究了反应温度、硝酸铈与草酸的物质的量比(nCH)、溶液pH以及反应时间对CeO2粉体颗粒的影响,确定了制备棒束状纳米CeO2粉体的最佳工艺参数;将最佳工艺参数下制得的CeO2对酸性品红溶液进行催化降解试验,并与块状CeO2催化降解结果进行对比。结果表明:制备棒束状纳米CeO2的最佳工艺参数为200℃、nCH=2∶3、pH=1、反应时间360 min;在此最佳工艺参数下制备的棒束状纳米CeO2对酸性品红溶液的催化活性比普通块状CeO2的大大提高。

Cluster-like CeO2 nanopowders were prepared by hydrothermal method in mixed alcohol-water solvents with Ce( NO3)3·6H2O and C2H2O4·2H2O as raw materials and triblock copolymers P123 as template.The effects of hydrothermal reaction temperature,ratio of cerium nitrate to oxalic acid( nCH),pH of solution and reaction time on CeO2 powders were studied to obtain the optimum synthesis parameters for synthesizing cluster-like CeO2 nano-powders. The catalytic degradation experiment of CeO2 prepared by the optimum parameters was carried out in acid fuchsin solution,and the degradation results were compared with the results of bulk CeO2. The results show that the optimum parameters for synthesizing cluster-like nano-powders can be summarized as follows: hydrothermal reaction temperature of 200 ℃,nCHof 2 ∶ 3,solution pH of 1 and reaction time of 360 min. Compared with bulk CeO2,the catalytic performance in scid fuchsin solution for the cluster-like CeO2 prepared using these optimum parameters increased greatly.