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

A. Simakov, I. Tuzovskaya, N. Bogdanchikova, A. Pestryakov, M. Avalos, M. H. Farias, E. Smolentseva

Research School of Chemistry & Applied Biomedical Sciences

Research output: Contribution to journal › Article

Abstract

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_m⁰ (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.

Original language	English
Pages (from-to)	1277-1281
Number of pages	5
Journal	Catalysis Communications
Volume	9
Issue number	6
DOIs	https://doi.org/10.1016/j.catcom.2007.11.027
Publication status	Published - 31 Mar 2008

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Keywords

Active sites
Clusters
CO catalytic oxidation
Gold
Nanoparticles

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

Cite this

Simakov, A., Tuzovskaya, I., Bogdanchikova, N., Pestryakov, A., Avalos, M., Farias, M. H., & Smolentseva, E. (2008). Influence of sodium on activation of gold species in Y-zeolites. Catalysis Communications, 9(6), 1277-1281. https://doi.org/10.1016/j.catcom.2007.11.027

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abstract = "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 Aunδ + (low-temperature activity) and gold nanoparticles Aum0 (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 (Aunδ +) is promising for improvement of activity and stability of the gold-zeolites catalysts.",

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AU - Simakov, A.

AU - Tuzovskaya, I.

AU - Bogdanchikova, N.

AU - Pestryakov, A.

AU - Avalos, M.

AU - Farias, M. H.

AU - Smolentseva, E.

PY - 2008/3/31

Y1 - 2008/3/31

N2 - 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 Aunδ + (low-temperature activity) and gold nanoparticles Aum0 (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 (Aunδ +) is promising for improvement of activity and stability of the gold-zeolites catalysts.

AB - 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 Aunδ + (low-temperature activity) and gold nanoparticles Aum0 (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 (Aunδ +) is promising for improvement of activity and stability of the gold-zeolites catalysts.

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KW - Clusters

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KW - Gold

KW - Nanoparticles

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Access to Document

10.1016/j.catcom.2007.11.027