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

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

Keywords

Active sites
Clusters
CO catalytic oxidation
Gold
Nanoparticles

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

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10.1016/j.catcom.2007.11.027

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title = "Influence of sodium on activation of gold species in Y-zeolites",

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.",

keywords = "Active sites, Clusters, CO catalytic oxidation, Gold, Nanoparticles",

author = "A. Simakov and I. Tuzovskaya and N. Bogdanchikova and A. Pestryakov and M. Avalos and Farias, {M. H.} and E. Smolentseva",

year = "2008",

month = mar,

day = "31",

doi = "10.1016/j.catcom.2007.11.027",

language = "English",

volume = "9",

pages = "1277--1281",

journal = "Catalysis Communications",

issn = "1566-7367",

publisher = "Elsevier",

number = "6",

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TY - JOUR

T1 - Influence of sodium on activation of gold species in Y-zeolites

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.

KW - Active sites

KW - Clusters

KW - CO catalytic oxidation

KW - Gold

KW - Nanoparticles

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JO - Catalysis Communications

JF - Catalysis Communications

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