Formation of silver active states in Ag/ZSM-5 catalysts for CO oxidation

E. Kolobova, A. Pestryakov, A. Shemeryankina, Y. Kotolevich, Oxana Anatolievna Martynyuk, H. J. Tiznado Vazquez, N. Bogdanchikova

Research output: Contribution to journalArticle

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Abstract

(Graph Presented) Silver supported on the ZSM-5 (ratio Si/Al = 50) were prepared by impregnation method and characterized by means of numerous analytical techniques: high resolution transmission electron microscopy (HRTEM), Fourier transformed infrared spectroscopy (FTIR) and diffuse reflectance UV-vis spectroscopy (DRS). Catalytic activities of the materials were evaluated in CO oxidation. It was shown that catalytic performance of xAg/ZSM-5 (x = 1, 3, 5, 7 wt.% Ag) depends strongly on Ag loading, among which 7%Ag/ZSM-5 displayed the best properties for the studied reactions. The studies revealed a strong influence of the redox pretreatment temperature on the catalytic activity of the samples. The experiments showed that Ag/ZSM-5 catalyst has a good reproducibility and stability in CO oxidation. Comparison of results of catalytic, structural and spectroscopic measurements allows suggesting Ag+ ions inside zeolite or on the external support surface as well as charged clusters Agn δ+ to be active states of silver in the studied process. The obtained results were compared with previous data for formation of active gold clusters Aun δ+ in zeolites. It is important for synthesis of catalytically stable bimetal Au-Ag systems.

Original languageEnglish
Pages (from-to)65-71
Number of pages7
JournalFuel
Volume138
DOIs
Publication statusPublished - 15 Dec 2014

Fingerprint

Zeolites
Carbon Monoxide
Silver
Catalyst activity
Bimetals
Oxidation
Catalysts
High resolution transmission electron microscopy
Ultraviolet spectroscopy
Impregnation
Gold
Infrared spectroscopy
Ions
Experiments
Temperature
Oxidation-Reduction

Keywords

  • Active sites
  • CO oxidation
  • Silver catalysts
  • Zeolite
  • ZSM-5

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Chemical Engineering(all)
  • Organic Chemistry

Cite this

Formation of silver active states in Ag/ZSM-5 catalysts for CO oxidation. / Kolobova, E.; Pestryakov, A.; Shemeryankina, A.; Kotolevich, Y.; Martynyuk, Oxana Anatolievna; Tiznado Vazquez, H. J.; Bogdanchikova, N.

In: Fuel, Vol. 138, 15.12.2014, p. 65-71.

Research output: Contribution to journalArticle

Kolobova, E, Pestryakov, A, Shemeryankina, A, Kotolevich, Y, Martynyuk, OA, Tiznado Vazquez, HJ & Bogdanchikova, N 2014, 'Formation of silver active states in Ag/ZSM-5 catalysts for CO oxidation', Fuel, vol. 138, pp. 65-71. https://doi.org/10.1016/j.fuel.2014.07.011
Kolobova, E. ; Pestryakov, A. ; Shemeryankina, A. ; Kotolevich, Y. ; Martynyuk, Oxana Anatolievna ; Tiznado Vazquez, H. J. ; Bogdanchikova, N. / Formation of silver active states in Ag/ZSM-5 catalysts for CO oxidation. In: Fuel. 2014 ; Vol. 138. pp. 65-71.
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AU - Kolobova, E.

AU - Pestryakov, A.

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AU - Martynyuk, Oxana Anatolievna

AU - Tiznado Vazquez, H. J.

AU - Bogdanchikova, N.

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AB - (Graph Presented) Silver supported on the ZSM-5 (ratio Si/Al = 50) were prepared by impregnation method and characterized by means of numerous analytical techniques: high resolution transmission electron microscopy (HRTEM), Fourier transformed infrared spectroscopy (FTIR) and diffuse reflectance UV-vis spectroscopy (DRS). Catalytic activities of the materials were evaluated in CO oxidation. It was shown that catalytic performance of xAg/ZSM-5 (x = 1, 3, 5, 7 wt.% Ag) depends strongly on Ag loading, among which 7%Ag/ZSM-5 displayed the best properties for the studied reactions. The studies revealed a strong influence of the redox pretreatment temperature on the catalytic activity of the samples. The experiments showed that Ag/ZSM-5 catalyst has a good reproducibility and stability in CO oxidation. Comparison of results of catalytic, structural and spectroscopic measurements allows suggesting Ag+ ions inside zeolite or on the external support surface as well as charged clusters Agn δ+ to be active states of silver in the studied process. The obtained results were compared with previous data for formation of active gold clusters Aun δ+ in zeolites. It is important for synthesis of catalytically stable bimetal Au-Ag systems.

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