物理化学学报 >> 1986, Vol. 2 >> Issue (02): 166-172.doi: 10.3866/PKU.WHXB19860211

研究论文 上一篇    下一篇

ZnO/γ-Al2O3体系的状态和表面结构的研究(Ⅰ)

赵璧英; 吴念祖; 桂琳琳; 唐有祺   

  1. 北京大学物理化学研究所物质结构研究室
  • 收稿日期:1985-05-04 修回日期:1985-11-02 发布日期:1986-04-15

STUDY OF THE STATE AND THE SURFACE STRUCTURE OF ZnO/γ-AI2O3 SYSTEM (Ⅰ)

Zhao Biying; Wu Nianzu; Gui Linlin; Tang Youqi   

  1. Laboratory for Stucture of Matter, Institute of Physical Chemistry, Peking University
  • Received:1985-05-04 Revised:1985-11-02 Published:1986-04-15

摘要: 本文用X射线衍射和X射线光电子能谱法研究了用浸渍法制取的ZnO/γ-Al_2O_3样品。实验表明, ZnO 极易与γ-Al_2O_3发生固相反应, 经240 ℃烘烤就可以观察到反应的进行。
样品的结构和形态依其组成和焙烧条件而异。氧化锌含量较低的样品由缺锌铝酸锌构成, 基表相Zn浓度取决于样品组成和焙烧温度。氧化锌含量较高的样品分两种情况: 低温焙烧的样品由Zn_xAl_2O_(3+x)(x<1)和晶相ZnO构成; 高温焙烧的样品可生成化学计量比的ZnAl_2O_4, 其上还单层分散着一层ZnO。仅当ZnO/ZnAl_2O_4中ZnO的含量超过此分散量时, 才有晶相ZnO析出。

Abstract: In this paper, ZnO/γ-Al_2O_3 system has been studied by XRD and XPS. Ex- perimental results show that ZnO reacts with γ-Al_2O_3 in solid state extremely readily, and it can be observed after heating at 240 ℃.
The structure and state of samples depond on the conditions of calcination and the composition of samples. The samples with less ZnO are made up of zinc-defi- cient zinc aluminate (Zn_xAl_2O_(3+x), 0It was estimated that most samples except those calcined at high temperature have not reached the equilibrium states. So, their structure and character should be closely related to the conditions of preparation and operation.