Abstract
Nanometric Fe2O3 particles could be inserted inside the internal pore volume of SBA-15 mesoporous silica and mesoporous alumina supports, when Fe(III) chelates (EDTA, gluconate or citrate) were used as impregnating precursors. The oxidative degradation of the chelating anions was followed by combined TG-DTA. Strong chelate-SiOH interactions (case of bulky EDTA), favored by the mesopore curvature, yield sub-nanometric extremely well dispersed Fe2O3 particles preferentially located at the micropore mouths (confinement effect). Fe2O3 even more strongly interacts with alumina walls, generating either (Fe,Al)2O3 mixed phases or Fe-aluminate micro domains. These iron-based mesoporous alumina composites proved very active catalysts in total oxidation of phenol at ambient conditions, with extremely low iron leaching (0.2%).
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Gabelica, Z., Charmot, A., Vataj, R. et al. Thermal degradation of iron chelate complexes adsorbed on mesoporous silica and alumina. J Therm Anal Calorim 95, 445–454 (2009). https://doi.org/10.1007/s10973-008-9256-z
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DOI: https://doi.org/10.1007/s10973-008-9256-z