Abstract
Highly dispersed η-Al2O3-based nanopowders have been prepared via glycine–nitrate combustion followed by heat treatment in air. The resultant materials have been characterized by X-ray diffraction, Fourier transform IR spectroscopy, scanning electron microscopy, simultaneous thermal analysis, and other techniques. We have optimized the glycine-to-nitrate ratio (G/N = 0.2) and found heat treatment conditions for combustion products (isothermal holding at a temperature of 700°C for 6 h) that allow one to obtain single- phase nanocrystalline η-Al2O3 powders with an average particle size of 5 ± 1 nm and specific surface area of 54 ± 5 m2/g. The acid–base surface properties of the η-Al2O3 nanopowder have been analyzed using pyridine sorption–desorption processes as an example. The specific concentrations of weak, intermediate, and strong Lewis acid centers on the surface of the η-Al2O3 nanocrystals have been shown to markedly exceed those on the surface of commercially available γ-Al2O3 (A-64). The synthesized nanopowders can thus be used as effective supports of acid catalysts.
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Original Russian Text © N.E. Kotlovanova, A.N. Matveeva, Sh.O. Omarov, V.V. Sokolov, D.N. Akbaeva, V.I. Popkov, 2018, published in Neorganicheskie Materialy, 2018, Vol. 54, No. 4, pp. 410–418.
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Kotlovanova, N.E., Matveeva, A.N., Omarov, S.O. et al. Formation and Acid–Base Surface Properties of Highly Dispersed η-Al2O3 Nanopowders. Inorg Mater 54, 392–400 (2018). https://doi.org/10.1134/S0020168518040052
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DOI: https://doi.org/10.1134/S0020168518040052