Controlled synthesis of nanostructured manganese oxide: crystalline evolution and catalytic activities

A hydrothermal process has been used to synthesize manganese oxides of various crystalline structures and morphologies, such as alpha -, beta -, gamma -MnO sub(2), MnOOH and Mn sub(3)O sub(4). The nanostructured materials were characterized by X-ray powder diffraction (XRD), scanning electron micros...

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Bibliographic Details
Published in:CrystEngComm 2013-01, Vol.15 (35), p.7010-7018
Main Authors: Sun, Ming, Lan, Bang, Lin, Ting, Cheng, Gao, Ye, Fei, Yu, Lin, Cheng, Xiaoling, Zheng, Xiaoying
Format: Article
Language:English
Subjects:
Catalytic activity
Crystal structure
Evolution
Manganese oxides
Nanostructure
Nanowires
Scanning electron microscopy
X-ray photoelectron spectroscopy
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Summary:A hydrothermal process has been used to synthesize manganese oxides of various crystalline structures and morphologies, such as alpha -, beta -, gamma -MnO sub(2), MnOOH and Mn sub(3)O sub(4). 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 sub(2)-TPR) techniques. The crystalline evolution mechanism of converting beta -MnO sub(2) or MnOOH to alpha -MnO sub(2) 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 -MnO sub(2) with ultra-long nanowires is higher than that of manganese oxides with other crystalline structures. The catalytic activity was correlated with the H sub(2)-TPR and XPS results.
ISSN:1466-8033
1466-8033
DOI:10.1039/c3ce40603b