Abstract
Monodisperse γ-Al2O3 beads with a diameter of 250 μm were prepared via a sol–gel method and the JetCutter. The bead-shaped support was used for the preparation of 0.23 % Au/γ-Al2O3 catalyst beads which were applied in the oxidation of glucose to gluconic acid. Simplified calculations of the effectiveness factor revealed that especially at high glucose concentrations the use of hydrogen peroxide would lead to much a higher catalyst activity than the use of oxygen as oxidant which was confirmed by the experimental results.
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