Low temperature oxidation of CO over tin-modified Pt/SiO2 catalysts

József L. Margitfalvi, Irina Borbáth, Mihály Hegedus, Ágnes Szegedi, Károly Lázár, Sándor Gobölös, Sándor Kristyán

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Abstract

Low temperature oxidation of CO over alloy type Sn-Pt/SiO2 catalysts with different Sn/Pt ratios has been investigated at different CO partial pressure using thermal programmed oxidation (TPO) technique and time on stream (TOS) experiments. The introduction of tin into platinum strongly increased the activity of the catalyst. The activity had a maximum, which depended on both the Sn/Pt (at./at.) ratio and the CO partial pressure. TOS experiments revealed the aging of the Sn-Pt/SiO2 catalysts. FTIR and Mössbauer spectroscopy has been used to follow compositional and structural changes of Sn-Pt/SiO2 catalysts during the catalytic run. The results show that the in situ formed, highly mobile "Snn+-Pt" ensemble sites are responsible for high activity, while formation of relatively stable SnOx type surface species are involved in the catalyst deactivation.

Original languageEnglish
Pages (from-to)343-353
Number of pages11
JournalCatalysis Today
Volume73
Issue number3-4
DOIs
Publication statusPublished - Apr 15 2002

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Keywords

  • "Sn-Pt" ensemble sites
  • FTIR spectroscopy
  • Low temperature CO oxidation
  • Mössbauer spectroscopy
  • Sn-Pt/SiO catalysts

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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