Abstract
AbstractThe morphology evolution from monoclinic molybdenum trioxide (β-MoO3) to orthorhombic molybdenum trioxide (α-MoO3) and quantitative analyses of their mixtures were examined. It was found that the morphology (from spherical to elliptical shape) and color (from green to white) displayed obvious changes when β-MoO3converted to α-MoO3in ambient air at 773 K. The transformation from β-MoO3to α-MoO3resulted from a change of the internal crystalline structure. The mass percent of β-MoO3in MoO3mixtures showed an excellent linear relationship with the relative intensity ratio of the strongest peaks in X-ray diffraction patterns. This approach provides a simple and time-saving method to evaluate the amount of β-MoO3, which is a promising material in catalyst and electrochemical applications, in such mixtures. This finding may provide guidance for the analysis of catalytic performance of MoO3mixtures. In addition, it was found that β-MoO3can be easily decomposed into suboxides such as MoO2and Mo4O11in pure argon gas atmosphere. The possible decomposition mechanism of β-MoO3is discussed.
Highlights
The morphology evolution from monoclinic molybdenum trioxide (β-MoO3) to orthorhombic molybdenum trioxide (α-MoO3) and quantitative analyses of their mixtures were examined
After confirming that the prepared products were all pure α-MoO3, samples were prepared for morphology observation and used to synthesize mixed MoO3 specimens
After carefully weighing and mixing β-MoO3 and α-MoO3 based on the specified mass ratio, the mixtures were homogenized for 30 min by milling in an agate mortar and subjected to the quantitative X-ray diffraction (XRD) analysis
Summary
Abstract: The morphology evolution from monoclinic molybdenum trioxide (β-MoO3) to orthorhombic molybdenum trioxide (α-MoO3) and quantitative analyses of their mixtures were examined. The mass percent of β-MoO3 in MoO3 mixtures showed an excellent linear relationship with the relative intensity ratio of the strongest peaks in X-ray diffraction patterns. This approach provides a simple and time-saving method to evaluate the amount of β-MoO3, which is a promising material in catalyst and electrochemical applications, in such mixtures. The possible decomposition mechanism of β-MoO3 is discussed Transition metal oxides, such as V2O5, CrO3, WO3, and MoO3, show several types of complex structures, formed mainly by two- or three-dimensional frameworks of octahedral or tetrahedrals [1,2,3]. The morphology evolution from β-MoO3 (spherical) to α-MoO3 and the possible decomposition mechanism of β-MoO3 were elucidated
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