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Deposition of silver nanoparticles into porous system of sol–gel silica monoliths and properties of silver/porous silica composites

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Abstract

Porous monolithic gels based on silica with pore size from 16 nm to 3–5 μm have been synthesized using sol–gel technology. Parameters of porous structure are determined by the components molar ratio in the reaction mixture. The reduction processes of silver ions by formamide in the synthesized porous gel were studied. It has been shown that at the initial stage of the reaction, silver particles with size up to 10 nm are formed in the absence of any stabilizers. The composites Ag/SiO2 were synthesized by means of the threefold impregnation of porous monoliths using the solution of silver nitrate in the mixture of methanol and formamide. Their catalytic activity in the CO oxidation was studied. It was discovered that after activation in oxygen and hydrogen the samples display a low temperature activity, which depends on the number of Si–O-nonbridging oxygen groups on the surface of silica porous monoliths.

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Acknowledgments

This work was supported by the Russian Foundation for Basic Research (Grant No. 12-03-90827-mol_RF_nr) and the Federal target program of the Ministry of Education and Science of the Russian Federation (Contract No. 16.522.12.2004).

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Correspondence to T. I. Izaak.

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Izaak, T.I., Martynova, D.O., Stonkus, O.A. et al. Deposition of silver nanoparticles into porous system of sol–gel silica monoliths and properties of silver/porous silica composites. J Sol-Gel Sci Technol 68, 471–478 (2013). https://doi.org/10.1007/s10971-013-2977-x

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  • DOI: https://doi.org/10.1007/s10971-013-2977-x

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