Influence of pretreatment conditions on acidity of cobalt-based bimetallic systems in NaY zeolite

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Co/NaY, Pt/NaY, Ru/NaY, Ru-Co/NaY and Pt-Co/NaY samples were pretreated in different ways and their Brønsted and Lewis acidities were measured by means of pyridine adsorption and by double-bond isomerization of 1-butene. It is established that during nitrogen/hydrogen pretreatment small metal or bimetallic particles are formed and the system possesses Brønsted and Lewis acidity, whereas by pretreatment in oxygen/hydrogen only Lewis acidity is developed (large metal particles segregated to the zeolite surface). The difference is due to the formation of proton-metal adducts inside the zeolite supercage when nitrogen/ hydrogen pretreatment is applied and this is ceased when oxygen/hydrogen pretreatment is used. This is fully supported by the double-bond isomerization of 1-butene to cis- and trans 2-butenes.

Original languageEnglish
Pages (from-to)7-10
Number of pages4
JournalCatalysis Letters
Issue number1-2
Publication statusPublished - Jan 1 1997



  • Cobalt-based mono- And bimetallic samples
  • Effect of treatment on brønsted and lewis acidity

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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