ChemInform Abstract: Preparation and Characterization of Pt(RuO2)/TiO2 Catalysts: Test in a Continuous Water Photolysis System.
Abstract
Pt(RuO2)/TiO2 photocatalysts are prepared using three different methods to deposit Pt on TiO2 or RuO2/TiO2 powders: 1. reaction of sodium citrate and H2PtCl6 in the presence of the powder, 2. H2 reduction of H2PtCl6-impregnated powders at 400 °C, and 3. photoplatinization using suspensions of the powder in aqueous H2PtCl6 solution.
ChemInform Abstract
Pt(RuO2)/TiO2 photocatalysts are prepared using three different methods to deposit Pt on TiO2 or RuO2/TiO2 powders: 1. reaction of sodium citrate and H2PtCl6 in the presence of the powder, 2. H2 reduction of H2PtCl6-impregnated powders at 400 °C, and 3. photoplatinization using suspensions of the powder in aqueous H2PtCl6 solution. The photocatalysts are characterized by several techniques and their catalytic performance for the water splitting process is studied using a continuous flow device. In the case of RuO2-free catalysts, the highest hydrogen production rate is observed for the catalysts prepared by photoplatinization. For catalysts containing RuO2, the highest H2 production rate is observed for catalysts prepared by hydrogenation at 400 °C. The presence of RuO2 significantly increases the catalytic activity of the catalyst prepared by hydrogenation, whereas it does not improve the activity of the catalysts prepared by the citrate method or by photoplatinization. These results are explained by the reduction of RuO2 yielding catalytic active ruthenium and by the doping of TiO2, both phenomena being promoted by the thermal treatment in H2.
