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 language | English |
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Pages (from-to) | 65-71 |
Number of pages | 7 |
Journal | Fuel |
Volume | 138 |
DOIs | |
Publication status | Published - 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