Journal of Shanghai University(Natural Science Edition) ›› 2020, Vol. 26 ›› Issue (4): 552-561.doi: 10.12066/j.issn.1007-2861.2064

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Ru nanoparticles supported on Mg-Al mixed metal oxide catalysts for selective oxidation of HMF methylfurfural into FDCA

WANG Lingchen1,2, CHEN Chunlin2, ZHANG Min1()   

  1. 1. College of Sciences, Shanghai University, Shanghai 200444, China
    2. Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China
  • Received:2018-04-17 Online:2020-08-30 Published:2020-01-30
  • Contact: ZHANG Min E-mail:mzhang@shu.edu.cn

Abstract:

Ru nanoparticles supported on Mg-Al mixed metal oxide catalysts have been prepared via the hydrothermal-reduction method. The structure, morphology and composition of the catalysts have been systematically analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), N2 physisorption, CO2-temperature programmed desorption(CO2-TPD) and inductively coupled plasma-optical emission spectroscopy (ICP-OES). The characterization results show that the highly dispersed Ru nanoparticles benefit from the strongest alkalinity (142.81 mmol·g-1 and the competitive specific surface area (97.0 m2·g-1 of mixed metal oxides with n(Mg):n(Al)=5:1. The RO-5 catalyst with Ru loading of 2.0% can efficiently catalyze aerobic oxidation of 5-hydroxymethylfurfural (HMF), obtaining 100.0% HMF conversion and 99.0% 2,5-furandicarboxylic acid (FDCA) yield under the optimal reaction condition (120 ℃ , 2 MPa O2, 5 h). According to the optimizing results, the reaction pathway for the conversion of HMF to FDCA is further confirmed for the formation of 2,5-diformylfuran,(DFF) and 5-formyl-2-furancarboxylic acid (FFCA) intermediates.

Key words: Mg-Al mixed oxide, Ru nanoparticles, oxidation, hydroxymethylfurfural, furandicarboxylic acid

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