Influence of sodium on activation of gold species in Y–zeolites

Catalytic tests of the Au–zeolites pure or doped with Na revealed the existence of two types of active sites of gold in CO oxidation – partly charged gold clusters Au n δ + (low-temperature activity) and gold nanoparticles Au m 0 (high-temperature activity). The data obtained demonstrates clear dire...

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Bibliographic Details
Published in:Catalysis communications 2008, Vol.9 (6), p.1277-1281
Main Authors: Simakov, A., Tuzovskaya, I., Bogdanchikova, N., Pestryakov, A., Avalos, M., Farias, M.H., Smolentseva, E.
Format: Article
Language:English
Subjects:
Active sites
Clusters
CO catalytic oxidation
Gold
Nanoparticles
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Summary:Catalytic tests of the Au–zeolites pure or doped with Na revealed the existence of two types of active sites of gold in CO oxidation – partly charged gold clusters Au n δ + (low-temperature activity) and gold nanoparticles Au m 0 (high-temperature activity). The data obtained demonstrates clear direct dependence of gold species reactivity on zeolite acid properties (Si/Al molar ratio and Na addition). Na modified Au–zeolites with different Si/Al molar ratio were found to be activated in CO oxidation in different degrees due to diverse redox state of supported gold species. The revealed effect of activation of one of two active species in CO oxidation ( Au n δ + ) is promising for improvement of activity and stability of the gold–zeolites catalysts.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2007.11.027