物理化学学报 >> 2004, Vol. 20 >> Issue (03): 251-255.doi: 10.3866/PKU.WHXB20040307

研究论文 上一篇    下一篇

耐高温高比表面氧化铬/氧化锆体系的制备和表征

曾莉;王春明;尉继英;朱月香;谢有畅   

  1. 北京大学化学与分子工程学院,分子动态与稳态国家重点实验室,北京 100871
  • 收稿日期:2003-09-11 修回日期:2003-11-03 发布日期:2004-03-15
  • 通讯作者: 朱月香 E-mail:zhuyx@pku.edu.cn

Preparation and Characterization of CrOx/ZrO2 with High Thermal Stability and High Specific Surface Area

Zeng Li;Wang Chun-Ming;Wei Ji-Ying;Zhu Yue-Xiang;Xie You-Chang   

  1. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871
  • Received:2003-09-11 Revised:2003-11-03 Published:2004-03-15
  • Contact: Zhu Yue-Xiang E-mail:zhuyx@pku.edu.cn

摘要: 采用浸渍法和共沉淀法制备了CrOx/ZrO2样品.制备过程中所得沉淀都经100 ℃碱液回流老化24 h.通过X射线衍射、X射线光电子能谱、氮吸附、差热-热重分析等手段对样品进行了表征.结果证实,碱液回流过程中会有SiO2从所用的玻璃器皿进入样品, SiO2的表面修饰作用提高了载体的热稳定性.氧化铬的引入进一步提高了所得样品的比表面和热稳定性.与浸渍法相比,共沉淀法制备的样品具有更好的性能.其中铬锆摩尔比为0.15时,用NaOH作沉淀剂, pH值为13的条件下制备的样品在1000 ℃焙烧后比表面仍达到121 m2•g-1.

关键词: 氧化锆, 氧化铬, 高比表面积, 热稳定性

Abstract: CrOx/ZrO2 samples were prepared by impregnation method and co-precipitation method. During the preparation all the precipitates were digested at 100 ℃ in their mother liquid for 24 h. The prepared samples were characterized by XRD、XPS、BET and TGA-DTA. It was proved that some silica dissolved from the glass vessels was deposited on the precipitates during the digestion and the presence of silica increased the crystallization temperature as well as the thermal stability of zirconia. Introducing CrOx into the system resulted in a further increase in the crystallization temperature of zirconia. In addition, the specific surface area and the thermal stability of the obtained samples were also significantly improved. Compared with impregnation method, co-precipitation method gave better results and a sample with a specific surface area of 121 m2•g-1 after calcination at 1000 ℃ was obtained.

Key words: Zirconia, Chromium oxide, High specific surface area, Thermal stability