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

33 Citations (Scopus)

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

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

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