Catalytic Conversion of Fructose and 5‑Hydroxymethylfurfural into 2,5-Furandicarboxylic Acid over a Recyclable Fe<sub>3</sub>O<sub>4</sub>–CoO<sub><i>x</i></sub> Magnetite Nanocatalyst
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Abstract
A nano-Fe<sub>3</sub>O<sub>4</sub>–CoO<sub><i>x</i></sub> catalyst
was prepared via a simple wet impregnation method.
The nano-Fe<sub>3</sub>O<sub>4</sub>–CoO<sub><i>x</i></sub> catalyst showed good catalytic performance for the conversion
of 5-hydroxymethylfurfural into 2,5-furandicarboxylic acid (FDCA)
with <i>t</i>-BuOOH as the oxidant. Several important reaction
parameters were explored, with the highest FDCA yield of 68.6% obtained
from HMF after 15 h at a reaction temperature of 80 °C. One-pot
conversion of fructose into FDCA was also successful via two steps.
Catalytic conversion of fructose over Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>–SO<sub>3</sub>H yielded 93.1% HMF, which was oxidized
in situ into FDCA with a yield of 59.8%. Furthermore, recycling of
nano-Fe<sub>3</sub>O<sub>4</sub>–CoO<sub><i>x</i></sub> was accomplished with the help of a magnetic field. Nano-Fe<sub>3</sub>O<sub>4</sub>–CoO<sub><i>x</i></sub> showed
high stability in the reaction process. The use of nonprecious metals
and no requirement of a base additive made this method much more economical
and environmentally friendly