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

Michael Bingham, Andrew Mills*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Article number113133
Number of pages8
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume409
Early online date10 Jan 2021
DOIs
Publication statusPublished - 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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