This paper is built on the Fenton-like oxidation of p-hydroxybenzoic acid (p–HBZ) in the presence of H₂O₂ and 3%Fe supported on CeO₂-TiO₂ aerogels under mild conditions. These catalysts were deeply characterized by XRD, H₂-TPR, TEM, STEM and XPS. The effect of thermal treatment, pH (2–3, 5, 7), H₂O₂/p–HBZ molar ratio (5, 15, 20, 25) and reaction temperature (25 °C, 40 °C and 60 °C) on the catalytic properties of supported Fe catalysts are studied. Our results highlight the role of CeO₂ and the calcination of the catalyst to obtain the highest catalytic properties after 10 min: 73% of p–HBZ conversion and 52% of TOC abatement.