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Synthesis of Sodium Borohydride Dihydrate and Specific Features of Its Thermolysis

Authors
  • Arkhangel’sky, I. V.1
  • Kravchenko, O. V.2
  • Tsvetkov, M. V.2
  • Dobrovol’sky, Yu. A.2
  • Shikhovtsev, A. V.2
  • Solovev, M. V.2
  • Zaitsev, A. A.2
  • 1 Lomonosov Moscow State University, Moscow, 119991, Russia , Moscow (Russia)
  • 2 Russian Academy of Sciences, Institute of Problems of Chemical Physics, Chernogolovka, Moscow oblast, 142432, Russia , Chernogolovka, Moscow oblast (Russia)
Type
Published Article
Journal
Russian Journal of Applied Chemistry
Publisher
Pleiades Publishing
Publication Date
Jun 01, 2019
Volume
92
Issue
6
Pages
734–742
Identifiers
DOI: 10.1134/S1070427219060028
Source
Springer Nature
Keywords
License
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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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