Catalytic and photocatalytic water gas shift reaction (WGSR) using a continuous flow, gas phase reactor

A series of different M/TiO2 catalysts are prepared, where M = Au, Pt, Pd and Ag, with a 0.2 wt% loading, tested for activity as photocatalysts the water gas shift reaction, WGSR, using continuous flow, phase reactor. For both thermal (dark) photocatalytic (UV irradiated) WGSR best catalyst/photocatalyst is Au/TiO2. The kinetics studied function reactor temperature, Au loading concentrations CO H2O. Langmuir-Hinshelwood observed non-competitive adsorption H2O, whereas those fit slightly more complex, previously reported, reaction mechanism. At 125 °C, Au/TiO2 photocatalysis very efficient, formal quantum efficiency 1/2H2 production 57 %. potential scale up relatively efficient discussed briefly.