Issue 5, 2003
From the journal:

Journal of Materials Chemistry

Characterization of molybdenum oxide supported on α-Al2O3

Zi Fenglan,a   Yan Jingfeng,b   Yang Pengcheng,b   Wang Xuekai,b   Guo Hongyoua  and  Wu Nianzu*b  

* Corresponding authors

a Applied Chemistry Department, Beijing University of Chemistry and Technology, Beijing 100029, China

b State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Physical Chemistry, Peking University, Beijing 100871, China
E-mail: wunz@chem.pku.edu.cn

Abstract

The monolayer dispersion of molybdenum oxide on the surface of α-Al2O3 has been studied by X-ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS). The dispersion threshold is 4.65 mg MoO3 per g α-Al2O3 or 5.6 Mo atoms nm−2. The structure of supported MoO3 is strongly dependent on the MoO3 loading. When the amount of MoO3 is below the dispersion threshold, the MoO3 species are highly dispersed on the surface of α-Al2O3, with the dispersed phase consisting of discrete [MoO4] polyhedrons. When the MoO3 loading exceeds the dispersion threshold, crystalline MoO3 appears on the surface of α-Al2O3. MoO3 exists in both dispersed and crystalline phases. According to the theory of phase isolation, the dispersed phase remains in the form of discrete [MoO4] polyhedrons. However, the crystalline phase of MoO3 is octahedral.

Graphical abstract: Characterization of molybdenum oxide supported on α-Al2O3

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Article information

DOI
https://doi.org/10.1039/B211494A
Article type
Paper
Submitted
20 Nov 2002
Accepted
10 Mar 2003
First published
28 Mar 2003

J. Mater. Chem., 2003,13, 1206-1209

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Characterization of molybdenum oxide supported on α-Al2O3

Z. Fenglan, Y. Jingfeng, Y. Pengcheng, W. Xuekai, G. Hongyou and W. Nianzu, J. Mater. Chem., 2003, 13, 1206 DOI: 10.1039/B211494A

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