Abstract
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.
Original language | English |
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Article number | 113133 |
Number of pages | 8 |
Journal | Journal of Photochemistry and Photobiology A: Chemistry |
Volume | 409 |
Early online date | 10 Jan 2021 |
DOIs | |
Publication status | Published - 15 Mar 2021 |
Bibliographical note
Publisher Copyright:© 2021 Elsevier B.V.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
Keywords
- Carbon monoxide
- Catalysis
- Gold
- Photocatalysis
- Titanium dioxide
- Water gas shift
ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)
- Physics and Astronomy(all)
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Mills, A. (Creator) & Bingham, M. (Creator), Queen's University Belfast, 04 Feb 2021
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