Photocatalysts Pt/TiO2 for CO2 reduction under ultraviolet irradiation

The kinetic regularities of photocatalytic CO2 reduction under the UV irradiation (380 nm) in the presence of water vapor were studied on the Pt-modified TiO2-based photocatalysts. The influence of deposited metal and thermal treatment of TiO2 on the rates of CO2 and methane reduction and CO formation rate was investigated. The highest reaction rates were achieved for TiO2 calcined at 700 °C for 3 h and then modified by platinum (1 wt.%). In this case, the methane formation rate was 0.3 µmol h−1 (g of catalyst)−1, and the total rate of photocatalytic CO2 reduction was 2.6 µmol h−1 (g of catalyst)−1, which is three times higher than the activity of the catalyst prepared without preliminary thermal treatment of TiO2.