碳化铈水解氧化法制备CeO_2纳米粉  

Preparation of CeO_2 Nanopowders by Hydrolysis and Oxidation of Cerium Carbide

作　　者：吴移清[1] 倪建森[1] 杜亚男[1] 胡鹏飞[1] 丁伟中[2] 耿淑华[2] 

机构地区：[1]上海大学微结构重点实验室,上海200072 [2]上海大学材料工程系,上海200072

出　　处：《无机材料学报》2012年第5期489-494,共6页Journal of Inorganic Materials

基　　金：上海市重点学科建设项目(S30107)~~

摘　　要：提出了一种可大规模制备Ce02纳米粉的有效方法．用碳化铈水解氧化制得颗粒大小为3-5nm的Ce02纳米粉．研究了各种实验参数包括水解温度、反应时间和投料比对Ce02纳米粉比表面积的影响．结果表明：较低的水解温度（室温附近），较高的投料比（1：20（g／mL））和适当的反应时间（18h）VJ得到比表面积为149m^2／g的Ce02纳米粉．优化实验参数（水解温度为30℃，水解时间为18h，投料比为1：20（g／mL），滤饼在空气中80℃烘干4h）得到中间产物Ce（OH）3和目标产物Ce02，并用XRD、TEM、SAED及紫外一可见光分光光度计进行测试表征．发现Ce（OH）3是由大量长为50-100nm，直径为5-20am的纳米棒组成．Ce02纳米粉具有较高的紫外吸收性能和较好的催化CO-胜能．An effective route for the synthesis of CeOz nanopowders on a large scale was presented. High-quality CeO2 nanopowders composed of nanoparticles with size of 3-5 nm were prepared by hydrolysis and oxidation of cerium carbide. The experimental variables which can tune the BET surface area of CeOz nanopowders, including hydrolysis reaction temperature, reaction time, as well as feed ratio of cerium carbide, were systematically. Experi- mental results indicate that the lower hydrolysis temperature （around room temperature）, higher feed ratio （1：20 （g/mL））, and proper reaction time （18 h） can product CeO2 nanopowders with higher surface area. The intermediate outcome Ce（OH）3 and aimed product CeO2 obtained with the optimized experimental variables （hydrolysis of ce- rium carbide powder at constant temperature （30℃） for 18 h in the suspension with feed ratio of 1：20 （g/mL） and dried at 80℃ for 4 h in the air） were characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）, selected area electron diffraction （SAED）, and UV-visible absorption spectrometer. It is found that the Ce（OH）3 is composed of a large quantity of rodlike nanostructures with length of 50-100 nm and diameter of 5-20 nm and the CeO2 nanopowders have higher UV-Vis absorbance property. Furthermore, the CeO2 nanopowders possess fine CO catalytic performance

关 键 词：碳化铈 CeO2纳米粉 CO催化 水解氧化 

分 类 号：O611[理学—无机化学]