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.
|Number of pages||8|
|Journal||Journal of Photochemistry and Photobiology A: Chemistry|
|Early online date||10 Jan 2021|
|Publication status||Published - 15 Mar 2021|
Bibliographical notePublisher Copyright:
© 2021 Elsevier B.V.
Copyright 2021 Elsevier B.V., All rights reserved.
- Carbon monoxide
- Titanium dioxide
- Water gas shift
ASJC Scopus subject areas
- Chemical Engineering(all)
- Physics and Astronomy(all)