Torre, Francesco and Valentoni, Antonio and Milanese, Chiara and Pistidda, Claudio and Marini, Amedeo and Dornheim, Martin and Enzo, Stefano and Mulas, Gabriele Raimondo Celestino and Garroni, Sebastiano (2015) Kinetic improvement on the CaH2-catalyzed Mg(NH2)2 + 2LiH system. Journal of alloys and compounds , in press. ISSN 0925-8388. eISSN 1873-4669. Article.
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In the present work we focused on the catalytic effect of CaH2 on the dehydrogenation process of the Mg(NH2)2–2LiH system. The synthesis, hydrogen storage properties and energy barriers were investigated by X-ray diffraction (XRD), temperature-programmed desorption (TPD) and differential scanning calorimetry (DSC). The TPD measurements proved that desorption of the Mg(NH2)2–2LiH system milled with 0.08 mol of CaH2 started at temperature of 78 °C, lower if compared with the 125 °C observed in the pristine material. Furthermore, Kissinger analysis revealed that CaH2 acted as a catalyst to decrease the activation energy of the first dehydrogenation step from a value of 133.8 ± 4.1 kJ/mol for the pristine material to 105.1 ± 3.2 kJ/mol when CaH2 was dispersed into the mixture.
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