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Fe-Zr-O catalyzed base-free aerobic oxidation of 5-HMF to 2,5-FDCA as a bio-based polyester monomer

Abstract

An environment-friendly and economical route for 5-hydroxymethylfurfural (HMF) aerobic oxidation to 2,5-furandicarboxylic acid (FDCA) in ionic liquid (IL)-promoted base-free reaction system was reported using Fe-Zr-O as catalyst. A series of FexZr1-xO2 catalysts were synthesized by a hydrothermal method and the catalytic performance was investigated. Among these catalysts, Fe0.6Zr0.4O2 exhibited excellent catalytic activity in the HMF oxidation. A 60.6% FDCA yield and 99.9% HMF conversion could be obtained after 24 h under 2 MPa O2 and base-free condition. The good performance could be attributed to the large amount of acidic and basic sites on the surface of the catalyst and its high reducibility and oxygen mobility. In addition, the formation of humins and reaction pathways in the ILs were also investigated, which revealed parallel reactions between FDCA and humins formation. The plausible reaction mechanism was proposed based on the results of a series of designed experiments. At last, the catalyst was used five times without obvious loss of activity. To the best of our knowledge, this is the best result for non-noble metal catalyzed base-free oxidation of HMF to FDCA using molecular oxygen as oxidant.

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Publication details

The article was received on 21 Aug 2017, accepted on 30 Sep 2017 and first published on 02 Oct 2017


Article type: Paper
DOI: 10.1039/C7CY01704A
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    Fe-Zr-O catalyzed base-free aerobic oxidation of 5-HMF to 2,5-FDCA as a bio-based polyester monomer

    D. Yan, J. Xin, Q. Zhao, K. Gao, X. Lu, G. Wang and S. Zhang, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY01704A

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