Synthesis of manganese oxide supported on mesoporous titanium oxide: Influence of the block copolymer

• Mesoporous manganese titanium oxides were synthesized using block copolymer.
• Block copolymers form complexes with Mn2+ from MnCl2.
• With block copolymer, manganese oxide can be dispersed around the titania crystallites.
• With Mn(acac)2, manganese is dispersed inside titania.
• MnOOH crystallizes outside mesoporous titania during hydrothermal treatment.

Manganese oxides supported on mesoporous titanium oxides were synthesized via a sol–gel route using block copolymer self-assembly. The oxides were characterized by X-ray diffraction, infrared spectroscopy, thermal analyses, nitrogen adsorption/desorption, electron microscopy and electronic paramagnetic resonance. A mesoporous anatase containing amorphous manganese oxide particles could be obtained with a 0.2 Mn:Ti molar ratio. At higher manganese loading (0.5 Mn:Ti molar ratio), segregation of crystalline manganese oxide occurred. The influence of block copolymer and manganese salt on the oxide structure was discussed. The evolution of the textural and structural characteristics of the materials upon hydrothermal treatment was also investigated.

One-pot amorphous MnO2 supported on mesoporous anataseTiO2.Figure optionsDownload as PowerPoint slide