物理化学学报 >> 2004, Vol. 20 >> Issue (09): 1155-1158.doi: 10.3866/PKU.WHXB20040919

研究简报 上一篇    下一篇

沉淀方法对CeO2-ZrO2系储氧材料性能的影响

庞秀江;龚茂初;王敏;任屹罡;赵明;陈耀强   

  1. 四川大学化学学院,成都 610064
  • 收稿日期:2003-12-15 修回日期:2004-04-12 发布日期:2004-09-15
  • 通讯作者: 陈耀强 E-mail:yqchen@email.scu.edu.cn

Effect of Precipitation Method on Properties of Oxygen Storage Materials CeO2-ZrO2

Pang Xiu-Jiang;Gong Mao-Chu;Wang Min;Ren Yi-Gang;Zhao Ming;Chen Yao-Qiang   

  1. Department of Chemistry, Sichuan University, Chengdu 610064
  • Received:2003-12-15 Revised:2004-04-12 Published:2004-09-15
  • Contact: Chen Yao-Qiang E-mail:yqchen@email.scu.edu.cn

摘要: 利用不同沉淀方法制备了一系列CeO2-ZrO2系储氧材料,并应用BET、XRD、TPR及其储氧性能测定等方法对储氧材料进行了研究.结果表明,不同的沉淀方法对样品的结构和性能有重要的影响.并流法可得到耐高温,储氧性能好,比表面积高的储氧材料;正滴法所得样品储氧量低但稳定,其比表面积抗老化性能差;反滴法所制备的样品储氧性能好,老化后比表面积较低.三种沉淀方法均可形成CeO2-ZrO2固溶体,材料的还原性能取决于比表面积,但与储氧性能无直接关系.

关键词: 储氧材料, 沉淀方法, 结构与性能

Abstract: In order to study the influence of oxygen storage materials′ preparation methods on their properties of oxygen storage capacity (OSC), surface area and reductive property, rare earth oxygen storage materials were prepared by different precipitation methods. Physical-chemical methods such as BET, XRD, H2-TPR and so on were used to study properties of these oxygen storage materials. Results indicated that solid solution could be got whichever method was used. But the properties of samples are sensitive to the preparation methods. When CeO2-ZrO2 was prepared by adding cerium and zirconium nitrate solution and ammonia solution simultaneously, the sample obtained had good OSC and high surface area. When CeO2-ZrO2 was prepared by adding the ammonia solution into the above nitrate solution, the sample obtained had poor but stable OSC and low surface area. When CeO2-ZrO2 was prepared by adding the above nitrate solution into the ammonia solution, the sample obtained had good OSC and low surface area. We also find that the OSC of materials prepared has no dependence on surface area but the reductivity of the materials depends on the surface area.

Key words: Oxygen storage material, Precipitation method, Structure and properties