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Reversible dehydrogenation of magnesium borohydride to magnesium triborane in the solid state under moderate conditions

Journal Article · · ChemComm
DOI:https://doi.org/10.1039/c0cc03461d· OSTI ID:1842963
 [1];  [2];  [2];  [3];  [4];  [1]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Tohoku Univ., Sendai (Japan)
  4. Univ. of Missouri, Columbia, MO (United States)
+ Show Author Affiliations
Thermal decomposition of magnesium borohydride, Mg(BH4)2, in the solid state was studied by a combination of PCT, TGA/MS and NMR spectroscopy. Dehydrogenation of Mg(BH4)2 at 200 °C en vacuo results in the highly selective formation of magnesium triborane, Mg(B3H8)2. This process is reversible at 250 °C under 120 atm H2. Dehydrogenation at higher temperature, >300 °C under a constant argon flow of 1 atm, produces a complex mixture of polyborane species. A borohydride condensation mechanism involving metal hydride formation is proposed.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1842963
Report Number(s):
PNNL-SA-111525
Journal Information:
ChemComm, Journal Name: ChemComm Journal Issue: 4 Vol. 47; ISSN 1359-7345
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English

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Cited By (11)

Hydrogen Desorption in Mg(BH4)2-Ca(BH4)2 System journal August 2019
Facile Synthesis of Unsolvated Alkali Metal Octahydrotriborate Salts MB 3 H 8 (M=K, Rb, and Cs), Mechanisms of Formation, and the Crystal Structure of KB 3 H 8 journal February 2019
Molten metal closo -borate solvates journal January 2019
Morphology‐Dependent Stability of Complex Metal Hydrides and Their Intermediates Using First‐Principles Calculations journal March 2019
The interconversion between THF·B 3 H 7 and B 3 H 8 − : an efficient synthetic method for MB 3 H 8 (M = Li and Na) journal January 2019
Kinetic Enhancement of Direct Hydrogenation of MgB 2 to Mg(BH 4 ) 2 upon Mechanical Milling with THF, MgH 2 , and/or Mg journal March 2019
The renaissance of hydrides as energy materials journal December 2016
Quantitative Assessment of B−B−B, B−H b −B, and B−H t Bonds: From BH 3 to B 12 H 12 2− journal July 2019
Metal borohydrides and derivatives – synthesis, structure and properties journal January 2017
Facile Synthesis of Unsolvated Alkali Metal Octahydrotriborate Salts MB 3 H 8 (M=K, Rb, and Cs), Mechanisms of Formation, and the Crystal Structure of KB 3 H 8 journal January 2019
Potassium octahydridotriborate: diverse polymorphism in a potential hydrogen storage material and potassium ion conductor journal January 2019

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