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.
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Guczi, L., Kónya, Z., Koppány, Z. et al. Influence of pretreatment conditions on acidity of cobalt-based bimetallic systems in NaY zeolite. Catalysis Letters 44, 7–10 (1997). https://doi.org/10.1023/A:1018940017294
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DOI: https://doi.org/10.1023/A:1018940017294