Mössbauer spectroscopy studies of Sn-Pt/Al2O3 catalysts prepared by controlled surface reactions

Cs Vértes, E. Tálas, I. Czakó-Nagy, J. Ryczkowski, S. Göbölös, A. Vértes, J. Margitfalvi

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Abstract

Mössbauer spectroscopy was used to study the chemical state of tin in a new type of Sn-Pt/Al2O3 catalysts. Controlled surface reaction of tin tetraethyl with hydrogen preadsorbed on platinum resulted in the exclusive formation of a Pt-SnEt3 surface complex, which decomposed in hydrogen at 773 K to PtxSn alloy (3 < x < 4). Contamination of the catalyst by air at room temperature resulted in partial oxidation of tin in the alloy to SnO2. Upon oxidation at 673 K tin segregated to SnO2. Both SnO2 and PtxSn alloy were detected in the rereduced catalyst. Anchoring SnCl2 onto lithiated Pt/Al2O3 and subsequent reduction of the catalyst in hydrogen did not result in the formation of tin-platinum alloy, indicating an exclusive tin-alumina interaction.

Original languageEnglish
Pages (from-to)149-159
Number of pages11
JournalApplied catalysis
Volume68
Issue number1
DOIs
Publication statusPublished - 1991

Keywords

  • Mössbauer spectroscopy
  • catalyst characterization (Mössbauer spectroscopy).
  • controlled surface reactions
  • tin-platinum/alumina

ASJC Scopus subject areas

  • Engineering(all)

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    Vértes, C., Tálas, E., Czakó-Nagy, I., Ryczkowski, J., Göbölös, S., Vértes, A., & Margitfalvi, J. (1991). Mössbauer spectroscopy studies of Sn-Pt/Al2O3 catalysts prepared by controlled surface reactions. Applied catalysis, 68(1), 149-159. https://doi.org/10.1016/S0166-9834(00)84099-3