Journal
APPLIED SURFACE SCIENCE
Volume 568, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.150972
Keywords
Catalytic oxidation; Manganese oxide; alpha@delta-MnO2; Advanced oxidation
Categories
Funding
- National Natural Science Foundation of China [21876107, 22076118]
- Shanghai Sailing Program [21YF1420800]
- Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery [2020GFZX006]
- Startup Fund for Youngman Research at SJTU [21X010500781]
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The study successfully synthesized a series of alpha@delta-MnO2 catalysts with different alpha/delta phase ratios using a hydrothermal method, accurately controlling the molar ratio of KMnO4 to MnSO4•H2O. It was found that the catalysts exhibited significantly better catalytic performance compared to single-phase MnO2.
The construction of composite crystal structure is an effective strategy for developing enhanced functionality and can generally be constructed via two steps. Herein, a series of alpha@delta-MnO2 catalysts with different alpha/delta phase ratios are one-pot synthesized using a hydrothermal method; their molar ratio of KMnO4 to MnSO4 center dot H2O was accurately controlled from 2.9 to 3.7. The catalytic results show that all alpha@delta-MnO2 catalysts exhibit significantly better catalytic performance in oxidizing toluene than single alpha-MnO2 and delta-MnO2 due to a synergistic effect, in which alpha@delta-2 with the closest two-phase proportion has the highest activity (T-90 = 238 degrees C under a WHSV of 60,000 mL.g(-1).h(-1)). Various characterization results indicate that alpha@delta-2 has the largest specific surface area, highest defects, oxygen vacancies, and best low-temperature reducibility among alpha-MnO2, delta-MnO2, and alpha@delta-2. Also, the possible reaction pathway for oxidizing toluene over the prepared catalysts is speculated using both TD/GC-MS and in-situ DRIFTS experiments.
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