Characterisation of acidic properties of the surface of SiO2–SnO2 obtained by sol-gel method in anhydrous conditions

A series of SiO 2 –SnO 2 samples of the Sn/Si molar fractions of 0.05, 0.1, 0.25, 0.5 and 1.0 were synthesised by the sol-gel method in anhydrous conditions. The SiO 2 –SnO 2 samples were characterised by XRD, low-temperature nitrogen adsorption, SEM, 29Si MAS NMR and TPD, using pyridine and acetoni...

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Bibliographic Details
Published in:Protection of metals and physical chemistry of surfaces 2016-09, Vol.52 (5), p.786-792
Main Authors: Nowicki, W., Piskuła, Z., Kirszensztejn, P.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Metallic Materials
Physicochemical Processes at the Interfaces
Tribology
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Summary:A series of SiO 2 –SnO 2 samples of the Sn/Si molar fractions of 0.05, 0.1, 0.25, 0.5 and 1.0 were synthesised by the sol-gel method in anhydrous conditions. The SiO 2 –SnO 2 samples were characterised by XRD, low-temperature nitrogen adsorption, SEM, 29Si MAS NMR and TPD, using pyridine and acetonitrile as probes. It has been proved that incorporation of small or even insignificant amount of tin in the structure of SiO 2 gel lattice considerably increased the number and power of acidic centres accessible to the probe molecules in the samples synthesised by the sol-gel method in anhydrous conditions. The increase in the number and power of acidic centres can substantially improve the catalytic properties of the SiO 2 –SnO 2 system.
ISSN:2070-2051
2070-206X
DOI:10.1134/S2070205116050178