Reversible oxidation/reduction of silver supported on silica aerogel: Influence of the addition of phosphate View Full Text


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Article Info

DATE

2011-09

AUTHORS

G. V. Mamontov, T. I. Izaak, O. V. Magaev, A. S. Knyazev, O. V. Vodyankina

ABSTRACT

Ag/SiO2 and Ag3PO4/SiO2 systems supported on silica aerogel were investigated using temperature-programmed reduction (TPR), UV-visible diffuse reflectance spectroscopy (UV-vis DRS), and infrared spectroscopy. The formation of highly dispersed silver particles, uniformly distributed along the surface and stabilized with silanol groups, was observed for Ag/SiO2 system. Phosphate and silanol groups produce two states of silver localization in phosphate-containing system. The addition of phosphate onto the silica surface leads to the reversible oxidation/reduction of silver in the temperature range of 100–300°C with transitions of silver (particles 10–30 nm in size) to charged states (ions, clusters stabilized by phosphate groups). This reversible behavior of silver is stable, and the amount of silver involved in these processes remained constant (∼50%) for the series of consistent cyclic oxidation/reduction treatments. More... »

PAGES

1540

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0036024411090159

DOI

http://dx.doi.org/10.1134/s0036024411090159

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1019228889


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