Résumé
Different salts are employed in the syntheses of pure and iron-containing mesoporous silica. Fluoride ions buffer the pH of the synthesis mixture and favour introduction of iron in the final product. Samples synthesized in neutral conditions present thick pore walls and relatively low pore volume, with excellent stability upon activation. Extraction of surfactants upon washing and shrinking of pore walls upon calcination are responsible for severe modifications of the textural properties of samples synthesized in acidic conditions.