Properties of platinum-containing glass-fiber catalysts in the SO2 oxidation reaction

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Abstract

SO2 oxidation catalysts containing small amounts (0.01–0.03 mass%) of platinum at the zirconia-promoted silica glass fibers (Pt-GFCs) demonstrate relatively high activity at moderate temperatures (below 400 °C) and the appropriate thermal stability (up to 700 °C). The catalytic activity of Pt-GFC in the SO2 oxidation reaction is provided by the small (< 1 nm) partially charged platinum clusters, while platinum in a form of large metal particles is practically inactive. Pt-GFCs have the high (up to ~20 mass%) sorption capacity with respect to SO2. Such sorption occurs via the interaction of SO2 with oxygen, either present in the gaseous reaction mixture or pre-adsorbed in the fresh GFC structure, with the possible formation of the intermediate sulfates in the glass bulk of the catalyst. Besides, Pt-GFC may effectively oxidize CO in the presence of significant amounts of sulfur dioxide.

Original languageEnglish
Pages (from-to)147-158
Number of pages12
JournalReaction Kinetics, Mechanisms and Catalysis
Volume116
Issue number1
DOIs
Publication statusPublished - Oct 2015

Keywords

  • Carbon monoxide
  • Catalytic oxidation
  • Glass-fiber catalyst
  • Platinum
  • Sulfur dioxide

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