Huaijian Wang1, Fangtong Liu1, Wenting Yang2, Chenglong Yu1, Huanhuan Xiong1, Jiaqi Li1, Meijuan Lu This email address is being protected from spambots. You need JavaScript enabled to view it.1

1 School of Environmental and Land Resource Management, Jiangxi Agricultural University, Nanchang 330045, China
2 School of Agricultural Sciences, Jiangxi Agricultural University, Nanchang 330045, China


Received: November 30, 2021
Revised: December 29, 2021
Accepted: January 2, 2022

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.210365  

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Cite this article:

Wang, H., Liu, F., Yang, W., Yu, C., Xiong, H., Li, J., Lu, M. (2022). Toluene Conversion by Using Different Morphology MnO2 Catalyst. Aerosol Air Qual. Res. 22, 210365. https://doi.org/10.4209/aaqr.210365


HIGHLIGHTS

  • Different morphology MnO2 were successfully prepared via hydrothermal process.
  • Nanotube had the largest specific surface area and the highest Mn4+ content.
  • Nanotube expressed the best of low-temperature reduction.
  • Nanotube showed the highest activity for toluene conversion.
 

ABSTRACT


MnOx was one of the important catalysts for the degradation of organic compounds. MnO2 with different morphology (nanotube, nanowire, nanocubic and nanoflower) were synthesized by hydrothermal method using KMnO4 and MnSO4 as precursors. Firstly, their structures were studied by X-ray diffraction (XRD), N2 adsorption desorption curve, H2 temperature programmed reduction (H2-TPR) and X-ray electron spectroscopy (XPS). Next, their catalytic conversion test for toluene was carried out under the condition of toluene concentration of 500 ppm and gas flow rate of 200 mL min1. The results showed that the crystal structure of nanotube and nanowire were α-MnO2, nanoflower was α-MnO2 phase and other crystalline, the nanocube was β-MnO2. For the different morphology MnO2, their catalytic conversion activity for toluene were increased with the rise of temperature. Nanotube, nanowire, nanoflower and nanocube reached 100% toluene conversion at 225°C, 250°C, 275°C and 325°C, respectively. MnO2 nanotube showed the highest activity for toluene among all the samples, which attribute to the larger specific surface area, better low-temperature reduction performance and higher the Mn4+ content.


Keywords: MnO2 nanotube, MnO2 nanowire, MnO2 nanocube, MnO2 nanoflower, Toluene conversion




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