1：Experimental Design and Method Selection:

The study involved the synthesis of Fe–TiO2 nanoparticles through multiple impregnations from organic solutions of Ti n-butoxide and Fe acetylacetonate, followed by thermal treatment. The microstructure, morphology, and magnetic properties were analyzed using X-ray analysis, transmission electron microscopy, energy-dispersive analysis, M?ssbauer spectroscopy, and magnetic susceptibility.

2：Sample Selection and Data Sources:

Granulated (δ + 10% α) Al2O3 with particle size 0.2 mm and specific surface area 80 m2/g was used as a support. Fe–TiO2/Al2O3 samples were synthesized with Fe concentration from 0.24 to 5 wt %.

3：2 mm and specific surface area 80 m2/g was used as a support. Fe–TiO2/Al2O3 samples were synthesized with Fe concentration from 24 to 5 wt %. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Ti n-butoxide (Sigma-Aldrich), Fe acetylacetonate, toluene, Al2O3 support, DRON-3M diffractometer, JEOL JEM 2100 TEM, PPMS-9 Quantum Design setup for magnetic measurements, Wissel electrodynamic type spectrometer for M?ssbauer spectroscopy, Lambda35 PerkinElmer spectrometer for UV-visible adsorption spectroscopy.

4：Experimental Procedures and Operational Workflow:

The synthesis involved wetness controlled impregnation of the support with Ti n-butoxide and Fe acetylacetonate solutions, drying, and calcination. The process was repeated to achieve target Fe and Ti concentrations.

5：Data Analysis Methods:

XRD patterns were treated using GLRDIF software. M?ssbauer spectra were treated using least squares calculation software (LOREN, NORMOS). Magnetic data were analyzed using Curie–Weiss law.