Co-existance of various active gold species in Au-mordenite catalyst for CO oxidation

I. V. Tuzovskaya, A. V. Simakov, A. N. Pestryakov, N. E. Bogdanchikova, V. V. Gurin, M. H. Farías, H. J. Tiznado, M. Avalos

Research School of Chemistry & Applied Biomedical Sciences

Research output: Contribution to journal › Article › peer-review

41 Citations (Scopus)

Abstract

Different structural and electronic states of gold species in H-mordenite with SiO₂/Al₂O₃ molar ratio 206 and their transformations under redox treatments have been studied by the methods of diffuse reflectance UV-visible spectroscopy and FTIR spectroscopy of adsorbed CO. Different states of ionic and metallic gold were detected in the zeolite channels and on the external surface of the zeolite - Au⁺ and Au³⁺ ions, charged clusters Au_n^{δ +}, and neutral nanoparticles Au_m. Catalytic tests of the samples revealed the co-existence of several types of active species of gold in CO oxidation - gold clusters <1.5 nm (responsible for low-temperature activity) and gold nanoparticles (responsible for high-temperature activity).

Original language	English
Pages (from-to)	977-980
Number of pages	4
Journal	Catalysis Communications
Volume	8
Issue number	7
DOIs	https://doi.org/10.1016/j.catcom.2006.10.014
Publication status	Published - Jul 2007

Keywords

Active sites
Catalyst
Gold
Oxidation
Zeolite

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

Access to Document

10.1016/j.catcom.2006.10.014

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title = "Co-existance of various active gold species in Au-mordenite catalyst for CO oxidation",

abstract = "Different structural and electronic states of gold species in H-mordenite with SiO2/Al2O3 molar ratio 206 and their transformations under redox treatments have been studied by the methods of diffuse reflectance UV-visible spectroscopy and FTIR spectroscopy of adsorbed CO. Different states of ionic and metallic gold were detected in the zeolite channels and on the external surface of the zeolite - Au+ and Au3+ ions, charged clusters Aunδ +, and neutral nanoparticles Aum. Catalytic tests of the samples revealed the co-existence of several types of active species of gold in CO oxidation - gold clusters <1.5 nm (responsible for low-temperature activity) and gold nanoparticles (responsible for high-temperature activity).",

keywords = "Active sites, Catalyst, Gold, Oxidation, Zeolite",

author = "Tuzovskaya, {I. V.} and Simakov, {A. V.} and Pestryakov, {A. N.} and Bogdanchikova, {N. E.} and Gurin, {V. V.} and Far{\'i}as, {M. H.} and Tiznado, {H. J.} and M. Avalos",

year = "2007",

month = jul,

doi = "10.1016/j.catcom.2006.10.014",

language = "English",

volume = "8",

pages = "977--980",

journal = "Catalysis Communications",

issn = "1566-7367",

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T1 - Co-existance of various active gold species in Au-mordenite catalyst for CO oxidation

AU - Tuzovskaya, I. V.

AU - Simakov, A. V.

AU - Pestryakov, A. N.

AU - Bogdanchikova, N. E.

AU - Gurin, V. V.

AU - Farías, M. H.

AU - Tiznado, H. J.

AU - Avalos, M.

PY - 2007/7

Y1 - 2007/7

N2 - Different structural and electronic states of gold species in H-mordenite with SiO2/Al2O3 molar ratio 206 and their transformations under redox treatments have been studied by the methods of diffuse reflectance UV-visible spectroscopy and FTIR spectroscopy of adsorbed CO. Different states of ionic and metallic gold were detected in the zeolite channels and on the external surface of the zeolite - Au+ and Au3+ ions, charged clusters Aunδ +, and neutral nanoparticles Aum. Catalytic tests of the samples revealed the co-existence of several types of active species of gold in CO oxidation - gold clusters <1.5 nm (responsible for low-temperature activity) and gold nanoparticles (responsible for high-temperature activity).

AB - Different structural and electronic states of gold species in H-mordenite with SiO2/Al2O3 molar ratio 206 and their transformations under redox treatments have been studied by the methods of diffuse reflectance UV-visible spectroscopy and FTIR spectroscopy of adsorbed CO. Different states of ionic and metallic gold were detected in the zeolite channels and on the external surface of the zeolite - Au+ and Au3+ ions, charged clusters Aunδ +, and neutral nanoparticles Aum. Catalytic tests of the samples revealed the co-existence of several types of active species of gold in CO oxidation - gold clusters <1.5 nm (responsible for low-temperature activity) and gold nanoparticles (responsible for high-temperature activity).

KW - Active sites

KW - Catalyst

KW - Gold

KW - Oxidation

KW - Zeolite

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