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Acta Phys. -Chim. Sin.  1995, Vol. 11 Issue (03): 234-241    DOI: 10.3866/PKU.WHXB19950310
Article     
The Preparation of A |Model Nb Oxide Catalyst Epitaxially Grown
Xie Lei, Wang De-Zheng, Wei Xu-Ming, Cao Yu-Ming, Guo Xie-Xian, Ushikubo T, Wada K
State Key Laboratory on Catalysis,Dalian Institute of Chemical Physics Chinese Academy of Sciences,Dalian 116023|Mitsubishi Kasei Corporation,Research Center 1000,Kamoshida-cho,Midori-ku,Yokohama 227,Japan
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Abstract  

Metal oxides are useful catalytic materials but are not well understood due to a scarcity of fundamental studies. They are rarely available as single crystals and their insulator nature causes charging problems when electrons or ions are probes. We report the use of a technique to overcome these problems by anepitaxial growth onto a dissimilar metal to study the solid add niobium oxide. The model niobium oxide grew epitaxially on a single crystal Pt(111) substrate. The growth mode of the niobium oxide overlayers indicates that the overlayer grows as a 2D monolayer on the Pt substrate followed by the development of a high density of small 3D crystallites. LEED patterns from the niobium oxide overlayer indicate that the small crystallites of niobium oxide grew with the (111) structure of the Pt(111) substrate. The valence states of Nb of our model niobium oxide were determined from AES and ILS (ionization loss spectroscopy, which gives information similar to XPS) chemical shifts. Nb oxide overlayers could segregate into bulk Pt and decompose at high tempetature. This Nb oxide overlayers will be used as a model Nb oxide catalyst.



Key wordsEqitaxial growth      Nb oxide      Model catalyst      Crystal film     
Received: 09 February 1994      Published: 15 March 1995
Corresponding Authors: Wei Xu-Ming   
Cite this article:

Xie Lei, Wang De-Zheng, Wei Xu-Ming, Cao Yu-Ming, Guo Xie-Xian, Ushikubo T, Wada K. The Preparation of A |Model Nb Oxide Catalyst Epitaxially Grown. Acta Phys. -Chim. Sin., 1995, 11(03): 234-241.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB19950310     OR     http://www.whxb.pku.edu.cn/Y1995/V11/I03/234

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