期刊
MATERIALS RESEARCH BULLETIN
卷 43, 期 11, 页码 2912-2918出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2007.12.009
关键词
Nanostructures; Electron microscopy; Catalytic properties; Microstructure; Surface properties
资金
- Natural Science Foundation of China [20437010, 20637001, 20707012, 20070410070]
Spinel Co3O4 octahedra synthesized by a facile redox-precipitation method were investigated for the complete oxidation of methane. XRD analysis showed that the spinel structural Co3O4 octahedra had a relatively strong {111} diffraction peak as compared with that of the irregular shaped Co3O4 nanoparticles prepared by a conventional precipitation method. The results of methane combustion test demonstrated that the Co3O4 octahedra had no catalytic activity at 300-500 degrees C, while the Co3O4 irregular nanoparticles were highly active at the same reaction conditions. HRTEM studies revealed that the Co3O4 octahedra were predominantly exposed by the low Miller-index {111} facets with the lowest surface energy, and the Co3O4 irregular nanoparticles were exposed by various crystal facets. The results exhibited that the {111} facets with the low surface energy of the Co3O4 octahedra resulted in the inert catalytic activity in the methane oxidation reaction. (C) 2008 Elsevier Ltd. All rights reserved.
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