Promotion or additive activity? the role of gold on zirconia supported iron oxide in high temperature water-gas shift

Abrar A. Hakeem, Jaikishen Rajendran, Freek Kapteijn, Michiel Makkee

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Abstract

Sulfur addition is used to probe the role of gold in Au/Fe2O3/ZrO2 catalyst in the water-gas shift (WGS) at high temperature (623-773 K) and pressure (21 bar). Sulfur poisoning unravels the WGS activity contribution by gold nano-particles and gold promotion of iron oxide in Au/Fe2O3/ZrO2. The active site(s) on gold nano-particles are poisoned by sulfur, which is reflected in a suppressed WGS activity of presulfided Au/ZrO2. The same holds for the WGS activity contribution of gold nano-particles in Au/Fe2O3/ZrO2, but the promotion by gold of the Fe2O3 is still present after presulfidation. The WGS performance of Fe2O3/ZrO2 and Au/ZrO2 catalysts with and without sulfur pretreatment are also compared with that of Au/Fe2O3/ZrO2.

Original languageEnglish
Pages (from-to)115-123
Number of pages9
JournalJournal of Molecular Catalysis A: Chemical
Volume420
DOIs
Publication statusPublished - 1 Aug 2016

Keywords

  • Gold promotion
  • Iron oxide
  • Sulfur
  • Water-gas shift
  • Zirconia

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