Base-free selective conversion of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid over a CoOx-CeO2 catalyst

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

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Ce oxide-based catalysts with different molar ratio of Co/Ce (denoted as CoCe-x, x represents the Co to Ce ratio) were examined as the catalyst of 5-hydroxymethylfurfural (5-HMF) oxidation to 2,5-furandicarboxylic acid (FDCA). The Co to Ce ratio, catalyst amount and reaction temperature all have remarkable effects on yield and selectivity. Complete conversion of 5-HMF with 86.3% selectivity of FDCA has been achieved over the CoCe-0.15 catalyst at 130 °C with 0.6 MPa O2 pressure (gauge) for 4 h. The good performance is attributed to the high specific surface area and the high oxygen vacancy concentration to promote the mobility and adsorption of oxygen species. In addition, the CoCe-0.15 catalyst is reused for five times without significant activity loss. Finally, the reaction mechanism over the CoCe-0.15 catalyst under base-free condition is discussed. 5-HMF is oxidized by the lattice oxygen via Mars-van Krevelen mechanism with the redox of Ce4+/Ce3+ and Co3+/Co2+, and the lattice oxygen is replenished by adsorbing and activating O2 molecules.
Original languageEnglish
JournalCatalysis Today
DOIs
Publication statusE-pub ahead of print - 4 Nov 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • 5-Hydroxymethylfurfural
  • 2,5-Furandicarboxylic acid
  • Base-free
  • Selective oxidation
  • Co-Ce mixed oxide catalyst

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