物理化学学报 >> 2004, Vol. 20 >> Issue (10): 1221-1225.doi: 10.3866/PKU.WHXB20041011

研究论文 上一篇    下一篇

不同形态ZrO2的制备及其表面性质研究

马中义;徐润;杨成;魏伟;李文怀;孙予罕   

  1. 中国科学院山西煤炭化学研究所 煤转化国家重点实验室,太原 030001
  • 收稿日期:2004-03-02 修回日期:2004-06-03 发布日期:2004-10-15
  • 通讯作者: 孙予罕 E-mail:yhsun@sxicc.ac.cn

Preparation and Surface Properties of Different Zirconia Polymorphs

Ma Zhong-Yi;Xu Run;Yang Cheng;Wei Wei;Li Wen-Huai;Sun Yu-Han   

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan 030001
  • Received:2004-03-02 Revised:2004-06-03 Published:2004-10-15
  • Contact: Sun Yu-Han E-mail:yhsun@sxicc.ac.cn

摘要: 用ZrOCl2制备出具有单一形态的无定型、单斜和四方三种形态二氧化锆,采用SEM观察其表面形貌,FT-IR检测表面羟基形式,并通过NH3(CO2)-TPD和Py-FT-IR对其表面酸碱性进行研究.结果表明,不同形态二氧化锆的表面羟基种类具有较大差异:无定型二氧化锆表面存在氢键羟基,四方二氧化锆表面独有桥式羟基,而单斜二氧化锆表面具有两种类型的锥桥式羟基.同时不同形态二氧化锆表面酸碱性也具有较大差别.

关键词: 二氧化锆, 表面羟基, 酸碱性, FT-IR

Abstract: Amorphous, monoclinic and tetragonal zirconia with pure crystal phase were prepared from the same zirconium precursor, and then characterized by XRD,SEM,NH3-TPD,CO2-TPD and FT-IR techniques to determine and compare the different surface chemical properties of the three zirconia polymorphs. The results showed that different surface hydroxyl groups presented on the three-zirconia polymorphs. Bibridged hydroxyl only existed on tetragonal zirconia and amorphous showed obvious H-bond hydroxyl while two type of tribridged hydroxyl existed on monoclinic zirconia surface. Meanwhile the acidity-basicity properties were different on the three-zirconia polymorphs.

Key words: Zirconia, Surface hydroxyl, Acidity and basicity, FT-IR