期刊
CRYSTENGCOMM
卷 15, 期 35, 页码 7010-7018出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ce40603b
关键词
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资金
- Natural Science Foundation of Guangdong Province [10251009001000003, S2012010009680]
- Scientific Program of Guangzhou [2010Z1-E061]
- Scientific Program of Guangdong Province [2012A030600006]
- Fund of Higher Education of Guangdong Province [cgzhzd1104]
A hydrothermal process has been used to synthesize manganese oxides of various crystalline structures and morphologies, such as alpha-, beta-, gamma-MnO2, MnOOH and Mn3O4. The nanostructured materials were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and hydrogen temperature-programmed reduction (H-2-TPR) techniques. The crystalline evolution mechanism of converting beta-MnO2 or MnOOH to alpha-MnO2 was studied. The crystalline-dependent effect of the nanostructured manganese oxides was explored by using toluene combustion as a probe reaction. Results indicated that the catalytic activity of alpha-MnO2 with ultra-long nanowires is higher than that of manganese oxides with other crystalline structures. The catalytic activity was correlated with the H-2-TPR and XPS results.
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