Inorganic Materials

, Volume 54, Issue 12, pp 1238–1244 | Cite as

Thermolysis of Nanoparticulate Boehmite Prepared via Aluminum Isopropylate Hydrolysis

  • Yu. V. Posel’skayaEmail author
  • E. A. Belaya
  • D. A. Zherebtsov
  • V. V. Viktorov
  • S. S. Tikhonov
  • Yu. I. Ryabkov
  • I. N. Kovalev
  • D. A. Vinnik


Boehmite gel was prepared via hydrolysis of aluminum isopropylate in a water–alcohol solution. Electron-microscopic examination showed that the boehmite particles were highly uniform in diameter, at ~70 nm. X-ray fluorescence analysis demonstrated high purity of the material. The boehmite was heat-treated in air at 50, 165, 250, 400, 600, 800, 1000, and 1200°C and characterized by X-ray diffraction after each step. The crystallite size of the thermolysis products was found to increase from 1.1 to 3.6 nm in the range 50 to 1000°C. The gel sample dried at 50°C was characterized by simultaneous thermal analysis in combination with mass spectrometry of released gases. According to the thermal analysis results, the total weight loss in the sample was 45%. The mass spectrometry data allowed us to determine the overall formula of the synthesized gel. In the range 100–200°C, the gel lost the residual adsorbed isopropanol and isopropoxide groups, whereas water release continued up to 1000°C. We conclude that the degree of structural order, water content, and purity of the material influence the thermal stability of the metastable phases of aluminum oxide.


alumina aluminum oxyhydroxide phase transformations crystal structure 



This work was supported by the Russian Federation Government (Decree no. 211, March 16, 2013; agreement no. 02.A03.21.0011) and the Russian Federation Ministry of Education and Science (state research target no. 4.5749.2017/7.8).

We are grateful to Prof. A.V. Tochev for supplying the gibbsite.


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© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  • Yu. V. Posel’skaya
    • 1
  • E. A. Belaya
    • 2
  • D. A. Zherebtsov
    • 3
  • V. V. Viktorov
    • 1
  • S. S. Tikhonov
    • 3
  • Yu. I. Ryabkov
    • 4
  • I. N. Kovalev
    • 2
  • D. A. Vinnik
    • 3
  1. 1.South Ural Humanitarian Pedagogical UniversityChelyabinskRussia
  2. 2.Chelyabinsk State UniversityChelyabinskRussia
  3. 3.South Ural State UniversityChelyabinskRussia
  4. 4.Institute of Chemistry, Komi Scientific Center, Ural Branch, Russian Academy of SciencesSyktyvkarRussia

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