The thermodynamics and kinetics of hydrogen (H2) release from ethane 1,2-di-amineborane (EDAB, BH3NH2CH2CH2NH2BH3) were measured using Calvet and differential scanning calorimetry (DSC), pressure-composition isotherms, and volumetric gas-burette experiments. The results presented here indicate that EDAB releases ~ 9 wt.% H2 at temperatures ranging from 100 °C to 200 °C in two moderately exothermic steps, approximately -10±1 kJ/mol H2 and -3.8±1 kJ/mol H2. Isothermal kinetic analysis shows that EDAB is more stable than ammonia borane (AB) at temperatures lower than 100°C; however, the rates of hydrogen release are faster for EDAB than for AB at temperatures higher than 120°C. In addition, no volatile impurities in the H2 released by EDAB were detected by mass spectrometry upon heating with 1°C/min to 200°C in a calorimeter.
Revised: October 4, 2011 |
Published: July 18, 2011
Citation
Neiner D., A.J. Karkamkar, M. Bowden, Y. Choi, A.T. Luedtke, J.D. Holladay, and A.M. Fisher, et al. 2011.Kinetic and Thermodynamic Investigation of Hydrogen Release from Ethane 1,2-di-amineborane.Energy & Environmental Science 4, no. 10:4187-4193.PNNL-SA-80269.doi:10.1039/C1EE01884A