266202 New Methods to Generate Hydrogen From Boron-Compounds for Vehicle Applications

Wednesday, October 31, 2012: 8:50 AM
319 (Convention Center )
Arvind Varma, School of Chemical Engineering, Purdue University, West Lafayette, IN

Hydrogen-rich boron-compounds are attractive as hydrogen storage materials for vehicle applications. Among these, ammonia borane (AB, NH3BH3) has received considerable interest owing to its high hydrogen content (19.6 wt%), hydrogen release under moderate conditions, and stability at room temperature. We have recently proposed and demonstrated new methods to generate H2 from AB, including hydrothermolysis and thermolysis with additives. Using these approaches, high H2 yields (11-14 wt %) can be obtained with rapid kinetics at or near PEM fuel cell operating temperatures (80-90oC). In addition, magnesium borohydride (MBH, Mg(BH4)2) is also an attractive material because of its high hydrogen content (14.9 wt%), reversibility, and moderate hydrogen release temperature. It was found that certain additives can improve the dehydrogenation properties of MBH significantly. While neat MBH starts to release hydrogen > 270oC, MBH with a specific additive begins hydrogen release ~ 75oC, which is below PEM fuel cell operating temperatures. Our results suggest that the proposed methods are promising for hydrogen storage, and could be used for PEM fuel cell vehicle applications.

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