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

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Abstract

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
Volume44
Issue number1-2
Publication statusPublished - 1997

Fingerprint

Zeolites
Cobalt
Acidity
acidity
pretreatment
Hydrogen
butenes
cobalt
Butenes
Metals
metal particles
hydrogen
Isomerization
isomerization
Nitrogen
Oxygen
nitrogen
oxygen
Pyridine
adducts

Keywords

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

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

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title = "Influence of pretreatment conditions on acidity of cobalt-based bimetallic systems in NaY zeolite",
abstract = "Co/NaY, Pt/NaY, Ru/NaY, Ru-Co/NaY and Pt-Co/NaY samples were pretreated in different ways and their Br{\o}nsted 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 Br{\o}nsted 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.",
keywords = "Cobalt-based mono- And bimetallic samples, Effect of treatment on br{\o}nsted and lewis acidity",
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journal = "Catalysis Letters",
issn = "1011-372X",
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number = "1-2",

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T1 - Influence of pretreatment conditions on acidity of cobalt-based bimetallic systems in NaY zeolite

AU - Guczi, L.

AU - Kónya, Z.

AU - Koppány, Z.

AU - Stefler, G.

AU - Kiricsi, I.

PY - 1997

Y1 - 1997

N2 - 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.

AB - 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.

KW - Cobalt-based mono- And bimetallic samples

KW - Effect of treatment on brønsted and lewis acidity

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