华南理工大学学报(自然科学版) ›› 2008, Vol. 36 ›› Issue (11): 134-137.

• 材料科学与技术 • 上一篇    下一篇

制备条件对钙钛矿型BaZrO3储存NOx能力的影响

高爱梅 王周峰   

  1. 华南理工大学 材料科学与工程学院, 广东 广州 510640
  • 收稿日期:2008-04-18 修回日期:2008-05-05 出版日期:2008-11-25 发布日期:2008-11-25
  • 通信作者: 高爱梅(1979-),女,博士后,助理研究员,主要从事材料物理化学研究. E-mail:amgao@seut.edu.cn
  • 作者简介:高爱梅(1979-),女,博士后,助理研究员,主要从事材料物理化学研究.
  • 基金资助:

    中国博士后基金资助项目(20060400747)

Effects of Preparation Conditions on NOx Storage Capacity of Perovskite-Type BaZrO3

Gao Ai-mei  Wang Zhou-feng   

  1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2008-04-18 Revised:2008-05-05 Online:2008-11-25 Published:2008-11-25
  • Contact: 高爱梅(1979-),女,博士后,助理研究员,主要从事材料物理化学研究. E-mail:amgao@seut.edu.cn
  • About author:高爱梅(1979-),女,博士后,助理研究员,主要从事材料物理化学研究.
  • Supported by:

    中国博士后基金资助项目(20060400747)

摘要: 采用改进的柠檬酸络合溶胶-凝胶法制备了钙钛矿型BaZrO3催化剂,考察了焙烧温度、吸附温度及SO2浓度对BaZrO3样品富氧条件下的NOx储存性能(NSC)的影响;对其储存的NO2进行程序升温脱附(TPD-MS)测试,并通过BET比表面测定、X射线衍射等方法研究了催化剂的结构及其对性能的影响.结果表明:750℃下焙烧的BaZrO3的比表面积为84.0m2/g;900℃下焙烧的BaZrO3的烧结程度较高;BaZrO3是主要的NOx吸附中心,750℃焙烧制得的BaZrO3的NSC比900℃焙烧制得的高;BaZrO3样品储存NOx的最佳温度在400℃左右.

关键词: 钙钛矿型BaZr03, NOx 储存容量, 程序升温脱附

Abstract:

Perovskite-type BaZrO3 catalysts were prepared by means of a modified citric acid complex sol-gel method. Then, the effects of calcination temperature, adsorption temperature and SO2 concentration on the NOx storage capacity (NSC) of BaZrOz in the presence of excess oxygen were investigated. Moreover, a temperature-programmed desorption (TPD) of adsorbed NOx was performed and the BET surface area and XRD techniques were used to reveal the structure of perovskite-type BaZrO3  and to investigate its influence on performance. The results indicate that, as compared with the BaZrO3  calcinated at 900 ℃, the catalyst ealcinated at 750℃ possesses much higher BET surface area ( 84. 0m^2/g) and greater NSC, that BaZrO3  is the main absorption center of NOx, and that the optimum temperature for NO/storage by BaZrO3  is about 400 ℃.

Key words: perovskite-type BaZrO3, NOx storage capacity, temperature-programmed desorption