Arabinonic acid is an essential intermediate in the medical, pharmaceutical and chemical industries. However, the efficient and sustainable synthesis remains a significant challenge in this field. The rapid deactivation of catalysts in a strong acidic medium has hindered further industrial-scale implementation. This work presents a simple and effective approach to enhance the stability of metal catalysts during the oxidation of arabinose to arabinonic acid. As one of the key findings, the hydrothermal treatment of the TiO₂ supports has resulted in the generation of additional hydroxyl groups, thereby enhancing the dispersion and anchoring of metal species. Such morphological changes in the catalyst structure result in enhanced stability and improved restraint of unwanted C-C bond cleavage in sugar molecules, as demonstrated by detailed kinetic modeling. This modification can therefore prevent the formation of smaller carboxylic acids. This experimental study and kinetic modeling of catalyst stability provide valuable insights for improving the stability of catalysts in the synthesis of other important sugar-derived acids.