Characterization of Sn-Pt/SiO2 Catalysts Used in Selective Hydrogenation of Crotonaldehyde by Mössbauer Spectroscopy

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Abstract

Upon treatment of Sn-Pt/SiO2 catalysts with crotonaldehyde (CA) at 80°C formation of Sn4+ species was evidenced by Mössbauer spectroscopy. These results have confirmed the earlier suggestion that the "reaction induced selectivity improvement" observed in the hydrogenation of CA to crotylalcohol over Sn-Pt/SiO2 catalysts is related to the formation and stabilization of ionic forms of tin in the atomic closeness to the platinum. It is suggested that in our Sn-Pt/SiO2 catalysts the formed Sn4+ species are responsible for the activation of the carbonyl group, while further hydrogenation of crotylalcohol to n-butanol is prevented by the presence of a tin enriched Sn-Pt alloy phase on which the readsorption of crotylalcohol is strongly hindered.

Original languageEnglish
Pages (from-to)474-477
Number of pages4
JournalJournal of Catalysis
Volume190
Issue number2
DOIs
Publication statusPublished - Mar 10 2000

Keywords

  • Controlled surface reactions
  • Mössbauer spectroscopy
  • Reaction induced selectivity improvement
  • Selective hydrogenation of crotonaldehyde
  • Sn-Pt/SiO catalysts

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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