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

制备了一系列不同的M / TiO ₂催化剂，其中M = Au，Pt，Pd和Ag，负载量为0.2 wt％，并使用连续法测试了作为水煤气变换反应WGSR的催化剂和光催化剂的活性流，气相反应器。对于热（深色）和光催化（紫外线辐射）WGSR，最佳的催化剂/光催化剂是Au / TiO ₂。研究了WGSR的动力学与反应器温度，Au负载以及CO和H ₂ O浓度的关系。观察到了具有非竞争性吸附CO和H ₂的光催化WGSR的Langmuir-Hinshelwood动力学。O，而用于热WGSR的反应则拟合出稍微复杂一些的反应机制。在125°C下，负载量为0.2 wt％，WGSR的Au / TiO ₂光催化非常有效，1 / 2H ₂生成的形式量子效率为57％。简要讨论了相对高效的光催化WGSR的潜在规模。