Layered δ-MnO2 as an active catalyst for toluene catalytic combustion

[Display omitted] •Layered δ-MnO2 was synthesized by an optimized redox precipitation.•Layered δ-MnO2 showed high performance for toluene catalytic combustion.•The high catalytic performance was related to high surface area, strong redox capacity and rich oxygen vacancy of layered δ-MnO2. Layered δ-...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2020-07, Vol.602, p.117715, Article 117715
Main Authors: Li, Renzhu, Zhang, Long, Zhu, Simin, Fu, Shiyu, Dong, Xiaoping, Ida, Shintaro, Zhang, Lingxia, Guo, Limin
Format: Article
Language:English
Subjects:
Benzoic acid
Benzyl alcohol
Butanol
Catalysts
Catalytic activity
Catalytic combustion
Catalytic oxidation
Chemical precipitation
Chemical synthesis
Combustion
Low temperature
Maleic anhydride
Manganese dioxide
Oxidation
Potassium permanganate
Redox reactions
Toluene
X ray photoelectron spectroscopy
δ-MnO2layered
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Summary:[Display omitted] •Layered δ-MnO2 was synthesized by an optimized redox precipitation.•Layered δ-MnO2 showed high performance for toluene catalytic combustion.•The high catalytic performance was related to high surface area, strong redox capacity and rich oxygen vacancy of layered δ-MnO2. Layered δ-MnO2 was successfully synthesized by redox reaction precipitation between KMnO4 and n-butanol. Then, the as-synthesized layered δ-MnO2 was used as catalyst for toluene catalytic combustion and showed excellent catalytic performance. The T10 and T90 (the temperatures corresponded to the toluene conversion of 10 % and 90 %) were just 160 °C and 199 °C, respectively (1000 ppm toluene, GHSV = 60,000 mL/(g h, 20 vol.%O2/N2). In addition, the layered δ-MnO2 showed well catalytic stability and humid resistance. The as-prepared catalysts were characterized by XRD, N2 sorption, SEM, TEM, XPS, H2-TPR, O2-TPD and so on. Compared with the referenced ε-MnO2 and γ-MnO2, the higher catalytic activity of layered δ-MnO2 was ascribed to its higher specific surface area, stronger low-temperature reducibility and richer oxygen vacancy. Finally, the toluene catalytic oxidation mechanism over δ-MnO2 was also proposed based on the results of in-situ DRIFTs. And the key successively intermediate species for toluene oxidation over δ-MnO2 were benzyl alcohol, benzoic acid, maleic anhydride and acetate.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2020.117715