Decoding the role of oxygen defects in MnO2-based catalysts for enhanced VOCs oxidation

Wenjie Xiang, Wei Liu*, Guangbo Liu, Yingluo He, Shuang Yang, Xi Chen, Zhongxian Song, Xuejun Zhang*, Noritatsu Tsubaki*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Oxygen defects were essential in facilitating the catalytic oxidation process of VOCs by MnO2. However, it remains unclear whether surface oxygen defects or bulk oxygen defects have a greater influence on the catalytic performance of MnO2-based catalysts in VOCs oxidation. Therefore, CuO/MnO2 with rich surface defects and CuMnOx dominated by bulk oxygen defects were successfully prepared by a surface modification way and a hydrothermal synthesis method respectively, which was evidenced by the results of a series of characterization techniques (Raman, TEM, EPR and in situ DRIFTS, etc.) and the DFT calculation. The results of the activity evaluation showed that the effects of surface oxygen defects were decisive in improving the catalytic activity of MnO2-based catalysts. In-situ DRIFTS patterns showed the surface oxygen defects were involved in the chemisorption and preliminary oxidation of toluene, which was the rate-determining step in the oxidative decomposition of toluene. The CuO/MnO2 catalyst exhibited the best catalytic performance (T50 = 217 °C, T90 = 238 °C) compared with α-MnO2 (T50 = 253 °C, T90 = 287 °C) and CuMnOx (T50 = 230 °C, T90 = 259 °C). Moreover, CuO/MnO2 illustrated excellent stability, reusability, and water resistance ability, showing great potential for industrial applications.

Original languageEnglish
Article number102604
JournalMaterials Today Chemistry
Volume44
DOIs
StatePublished - 2025/03

Keywords

  • MnO-based catalysts
  • Oxygen defects
  • Toluene oxidation
  • Volatile organic compounds

ASJC Scopus subject areas

  • Catalysis
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Decoding the role of oxygen defects in MnO2-based catalysts for enhanced VOCs oxidation'. Together they form a unique fingerprint.

Cite this