Supercritical N2 Processing as a Route to the Clean Dehydrogenation of Porous Mg(BH4)2
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- 作者：Nicholas P. Stadie ; Elsa Callini ; Bo Richter ; Torben R. Jensen ; Andreas Borgschulte ; Andreas Z眉ttel
- 刊名：Journal of the American Chemical Society
- 出版年：2014
- 出版时间：June 11, 2014
- 年：2014
- 卷：136
- 期：23
- 页码：8181-8184
- 全文大小：314K
- 年卷期：v.136,no.23(June 11, 2014)
- ISSN：1520-5126
文摘
Compounds of interest for chemical hydrogen storage at near ambient conditions are specifically tailored to be relatively unstable and thereby desorb H2 upon heating. Their decomposition must be performed in the absence of impurities to achieve clean dehydrogenation products, which is particularly challenging for an emerging class of microporous complex hydride materials, such as 纬-phase Mg(BH4)2, which exhibits high surface area and readily adsorbs (sometimes undesired) molecular species. We present a novel strategy toward the purification of 纬-Mg(BH4)2 using supercritical nitrogen drying techniques, (1) showing that clean hydrogen can be released from Mg(BH4)2 under mild conditions and (2) clarifying the origin of diborane among the decomposition products of stable borohydrides, a topic of critical importance for the reversibility and practical applicability of this class of hydrogen storage compounds. This technique is also widely applicable in the pursuit of the high-purity synthesis of other porous, reactive compounds, an exciting future class of advanced functional materials.