266145 Improved Hydrogen Release From Magnesium Borohydride with Additives

Tuesday, October 30, 2012: 1:20 PM
305 (Convention Center )
Ahmad Al-Kukhun, Hyun Tae Hwang and Arvind Varma, School of Chemical Engineering, Purdue University, West Lafayette, IN

The dehydrogenation properties of magnesium borohydride (Mg(BH4)2­) with various additives were investigated.  It was found that certain additives can improve the dehydrogenation properties of magnesium borohydride significantly. While neat Mg(BH4)2­  starts to release hydrogen > 270oC, Mg(BH4)2­ with a specific additive begins hydrogen release ~ 75oC, as confirmed by mass spectrometry and thermogravimetry. The hydrogen yield of Mg(BH4)2­ in the presence of the additive was 3.7, 7.4, 10.0, 11.4 wt% for 150, 250, 300 and 350oC, respectively. Using pXRD, we confirmed that the final crystalline product at 300oC from Mg(BH4)2­ with the additive was Mg, while it was MgH2 for neat Mg(BH4)2­. Solid state 11B NMR analysis of Mg(BH4)2­ with the additive  at 300oC showed high selectivity towards the formation of Mg(B12H12) as intermediate, while neat Mg(BH4)2­ showed β-Mg(BH4)2­, Mg(B2H6) as well as some Mg(B12H12). Our results demonstrate that the additive is a promising one to provide high hydrogen yield values from Mg(BH4)2­ at moderate temperatures < 300oC, suitable for vehicle applications.

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See more of this Session: Aspects of Hydrogen Storage Systems and Materials
See more of this Group/Topical: 2012 International Congress on Energy (ICE)