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Synthesis of Sodium Borohydride Dihydrate and Specific Features of Its Thermolysis

  • Inorganic Synthesis and Industrial Inorganic Chemistry
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Abstract

Process of thermolysis of sodium borohydride dihydrate samples produced from solution and via a vapor was considered. A study of an acetonitrile solution made by the method of nuclear magnetic resonance demonstrated that the stoichiometry is observed in both cases. An X-ray diffraction analysis evidenced that the sample produced via a vapor is defective. It was found that, in both cases, the process begins after the reaction of peritectic decomposition of the starting compound occurs and a liquid phase is formed. The enthalpy of the peritectic reaction was determined to be ΔHreact = 18.6 ± 1.5 kJ mol−1 for the sample crystallized from an alkaline solution. For the sample produced via a vapor, this quantity is substantially smaller. The kinetics of a low-temperature thermolysis (40–80°C) of both samples is described by the Avrami—Erofeev equation.

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Acknowledgments

The study was carried out under the State assignment no. 0089-2019-0007, State registration no. 01201361853.

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Authors and Affiliations

  1. Lomonosov Moscow State University, Moscow, 119991, Russia

    I. V. Arkhangel’sky

  2. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    O. V. Kravchenko, M. V. Tsvetkov, Yu. A. Dobrovol’sky, A. V. Shikhovtsev, M. V. Solovev & A. A. Zaitsev

Authors
  1. I. V. Arkhangel’sky
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  2. O. V. Kravchenko
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  3. M. V. Tsvetkov
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  4. Yu. A. Dobrovol’sky
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  5. A. V. Shikhovtsev
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  6. M. V. Solovev
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  7. A. A. Zaitsev
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Corresponding author

Correspondence to M. V. Tsvetkov.

Additional information

Russian Text © The Author(s), 2019, published in Zhurnal Prikladnoi Khimii, 2019, Vol. 92, No. 6, pp. 703–711.

Conflict of Interest

The authors state that there is no conflict of interest to be disclosed in the paper.

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Arkhangel’sky, I.V., Kravchenko, O.V., Tsvetkov, M.V. et al. Synthesis of Sodium Borohydride Dihydrate and Specific Features of Its Thermolysis. Russ J Appl Chem 92, 734–742 (2019). https://doi.org/10.1134/S1070427219060028

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  • DOI: https://doi.org/10.1134/S1070427219060028

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