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7953471 
Journal Article 
Crystalline-phase-dependent catalytic performance of MnO2 for aerobic oxidation reactions 
Xu, Y; Huang, J; Yang, S; Wang, J; Chen, Wei; Chen, Yan; Ma, D; Yang, Yun; Huang, S 
2017 
Science China Press 
60 
12 
1196-1204 
English 
WOS:000423323000005 
Knowledge of the catalytic performances of different crystalline phases of a material is vital for the development of superior catalysts. In this study, different phases of MnO2 (α, β, γ, and δ) have been prepared by the oxidation of Mn2+, and their catalytic performances were evaluated using the aerobic oxidation of benzyl alcohol to benzaldehyde as a model reaction. α-MnO2 promoted the reaction to the highest yield. However, when the yields were normalized by the corresponding surface areas, δ-MnO2 exhibited the highest specific activity and α-MnO2 the lowest, indicating that the diverse microstructures resulting from the crystalline phase have a profound effect on catalytic performance. α-MnO2 showed the highest catalytic stability, resulting from its unchanged composition and morphology after use. Informed by the experimental results, a possible reaction mechanism involving the Mars-van Krevelen process was proposed. This work provides useful information for the development of effective catalysts for aerobic oxidation. © 2017, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature. 
crystalline phase; MnO2; aerobic oxidation