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 language | English |
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Article number | 102604 |
Journal | Materials Today Chemistry |
Volume | 44 |
DOIs | |
State | Published - 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