“Boron Effect” on the Thermal Decomposition of Light Metal Borohydrides MBH4 (M = Li, Na, Ca)

• Published in: Journal of physical chemistry. C Vol. 116; no. 1; pp. 1390 - 1394
• Main Author: Pendolino, Flavio
• Format: Journal Article
• Language: English
• Published: Columbus, OH American Chemical Society 12.01.2012
• Subjects: C: Energy Conversion and Storage; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Physics; Thermal expansion; thermomechanical effects and density; Thermal properties of condensed matter; Thermal properties of crystalline solids; Hydrogen 1; Thermal properties; Boron; Property composition relationship; Sodium; Thermal decomposition; Boron additions
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/jp206038a

The hydrogen release rate of thermal decomposition, after the melting, for the borohydride of lithium (Li), sodium (Na), and calcium (Ca) and their boron mixtures, at selected molar ratios, is investigated under 1 bar hydrogen pressure and nonisothermal conditions. The reaction is studied by means of manometric measurements. The maximum hydrogen release rate for all pure borohydrides is ∼8 × 10–3 bar/min. By adding boron to the borohydride systems, the hydrogen release rate is affected and, generally, is lowered. For the decomposition process of LiBH4+B, maximum rate is ∼2 × 10–3 bar/min. On the opposite, hydrogen rate is suppressed in boron mixtures of NaBH4. The addition of boron changed slightly the maximum rate of hydrogen release for Ca(BH4)2+B for first and second decomposition.