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CATALYSIS TODAY · 2020 · IF 5.825

Highly selective oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran over an α-MnO2 catalyst

Linhao Yu,Hong Chen,Zhe Wen,Mengmeng Jin,Zewei Ma,Xueli Ma,Yushuai Sang,Mengmeng Chen,Yongdan Li

Selective oxidation of 5-hydroxymethylfurfural (HMF) to 2, 5-diformylfuran (DFF) with molecular oxygen is realized with an α-MnO 2 catalyst under mild conditions. In this work, α-MnO 2 exhibited the best performance among the samples examined. Meanwhile, solvent shows a significant effect on the product selectivity and isopropanol is found good for improving the selectivity of DFF. 93.2 % conversion of HMF was achieved at 140 °C for 4 h with 84.3 % selectivity of DFF. Moreover, α-MnO 2 catalyst keeps good reusability in recycling for five times. The reaction pathway indicated that the lattice oxygen species on α-MnO 2 is involved in the selective oxidation of hydroxyl group in HMF molecule.

CAS / MDL: 1344-28-1 67-47-0 57-13-6 144-62-7 7785-87-7 7722-64-7

研究领域: 催化化学 · 绿色化学

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Reaction Kinetics Mechanisms and Catalysis · 2025 · IF 1.7

Trace lanthanum-modified α-MnO2 catalyst for total oxidation of toluene by weakening the Mn–O bond

Cheng Lijun,Lei Juan,Ren Xiaoli,Chang Hong,Ju Baihe

In this study, a series of La-α-MnO 2 catalysts with different La doping amounts were prepared by hydrothermal method. It was found that the introduction of La could reduce the crystallinity of α-MnO 2 and increase the specific surface area of the catalyst. Furthermore, La doping can significantly weaken the Mn–O bond, increase the surface Mn 3+ and O ads content, and enhance the oxygen mobility and low-temperature reducibility. The catalytic results indicated that La doping could significantly improve the catalytic oxidation performance of toluene, and 1%La-α-MnO 2 catalyst exhibited the best catalytic activity for toluene oxidation. The toluene conversion rate reaches 90% when the reaction temperature is only 215 °C. In addition, 1%La-α-MnO 2 catalyst presented good stability and repeatability during 50 h durability test under water vapor.

CAS / MDL: 10277-43-7

研究领域: 催化化学 · 环境科学 · 材料化学 · 化学工程

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Highly selective oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran over an α-MnO2 catalyst

Trace lanthanum-modified α-MnO2 catalyst for total oxidation of toluene by weakening the Mn–O bond