Kelyp O. Synthesis and physicochemical properties of mesoporous catalysts based on titanium dioxide, modified with 3d-metal ions (Mn, Co, Ni).

The influence of doping of nanosized titania in the form of powders and films with transition metal ions (Co, Mn and Ni) on the electronic structure, surface chemistry and catalytic activity was Energy level diagrams of synthesized films were design using the direct electrochemical measurements that allowed predicting high activity of the semiconductors in the electro- and photocatalytic processes. Efficiency of electrocatalytic oxygen reduction was shown to increase due to the incorporation of small amounts of dopants (up to 1%). The raise of metal ion content led to the lowering of the electrocatalytic activity. The optimal content of cobalt (1-5 %), nickel (5%) and manganese (1%) ions in TiO2 is shown to provide the maximum efficiency of dichromate ion reduction. The incorporation of cobalt, nickel and manganese ions led to the enhancement of the photocatalytic water denitrification process with formation of dinitrogen. The optimal synthesis and thermal treatment conditions of cobalt containing SiO2 and TiO2 nanosystems in catalytic CO oxidation were investigated. The Co3O4 spinel phase responsible for catalytic performance was detected in all cobalt containing samples. High catalytic activity was observed for the samples characterized by relatively high contents of surface active centres (cobalt cations with octahedral surroundings).