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Effect of the phase structure on the catalytic activity of MoO3 and potential application for indoor clearance

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Abstract

In this work, α-MoO3 and h-MoO3 are synthesized by a simple hydrothermal method. Under ambient conditions, α-MoO3 has a high catalytic wet air oxidation (CWAO) activity for methylene blue (MB), while h-MoO3 has no activity: 64% of MB can be degraded after 20 min. When adding an additional man-made light source, the performances of h-MoO3 and α-MoO3 remain almost unchanged. However, with elevating the reaction temperature from 25 to 40 °C, the activity has not been improved for h-MoO3, while the activity of α-MoO3 also has no improvement from 25 to 35 °C. When the temperature rises to 40 °C, the performance of α-MoO3 improved significantly: the degradation percentage reaches 90% after 20 min. Crystal structure analysis results show that the activity of α-MoO3 originates from Jahn–Teller distortion of the [MoO6] octahedron, resulting in the formation of Lewis acid sites. Furthermore, H2-temperature programmed reduction (H2-TPR) and O2-temperature programmed desorption (O2-TPD) results indicate that α-MoO3 has a higher lattice oxygen mobility and a higher oxidization ability than h-MoO3. This ambient CWAO process is energy-saving and low-cost, which is promising for indoor clearance.

Graphical abstract: Effect of the phase structure on the catalytic activity of MoO3 and potential application for indoor clearance

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Supplementary files

Article information


Submitted
24 Sep 2019
Accepted
13 Jan 2020
First published
15 Jan 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Effect of the phase structure on the catalytic activity of MoO3 and potential application for indoor clearance

P. Sun, F. Teng, Z. Yang, X. Yang, S. Zhai, S. Liang, W. Gu, W. Hao and S. Shi, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC05241K

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