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Structure of С@Al2O by multinuclear solid-state NMR spectroscopy

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Abstract

The 27Al, 1H MAS NMR method is used to study initial nanosized metastable aluminum oxides of a pseudoboehmite series (γ- and δ-Al2O3) after being coated with graphene (С@Al2O3) and annealed in the air (С@Al2O3-Т). It is demonstrated that aluminum nanoparticles coated with graphene and annealed at high temperatures (to 750°C for γ and 1180°C for δ) preserve their phase composition but differ from initial oxides by a very low concentration of defects (ОН groups). After the annealing of the graphene coating the hydroxyl cover of oxides is reduced, however, the set of ОН groups differs greatly from that of the initial oxides. Only one type of terminal ОН groups with a ~0.2 ppm shift and one type of bridging μ2-ОН groups with a 1.8 ppm shift for γ-Al2O3 from OH-μ2-AlVAl n and 2.1 ppm for δ-Al2O3 OH-μ2-AlIVAl n are observed. The data obtained make it possible to characterize in detail the δ-Al2O3 pure phase.

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Authors and Affiliations

  1. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

    D. F. Khabibulin, A. M. Volodin & O. B. Lapina

  2. Novosibirsk National Research State University, Novosibirsk, Russia

    D. F. Khabibulin & O. B. Lapina

Authors
  1. D. F. Khabibulin
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  2. A. M. Volodin
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  3. O. B. Lapina
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Corresponding author

Correspondence to O. B. Lapina.

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Devoted to the 80th anniversary of Professor S. P. Gabuda

Translated from Zhurnal Strukturnoi Khimii, Vol. 57, No. 2, pp. 368-374, March-April, 2016.

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Khabibulin, D.F., Volodin, A.M. & Lapina, O.B. Structure of С@Al2O by multinuclear solid-state NMR spectroscopy. J Struct Chem 57, 354–360 (2016). https://doi.org/10.1134/S0022476616020165

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