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.

Kinetic improvement on the CaH2-catalyzed Mg(NH2)2 + 2LiH system / Torre, Francesco; Valentoni, Antonio; Milanese, Chiara; Pistidda, Claudio; Marini, Amedeo; Dornheim, Martin; Enzo, Stefano; Mulas, Gabriele Raimondo Celestino Ettore; Garroni, Sebastiano. - In: JOURNAL OF ALLOYS AND COMPOUNDS. - ISSN 0925-8388. - 645:S1(2015), pp. 33021.S284-33021.S287. [10.1016/j.jallcom.2014.12.228]

Kinetic improvement on the CaH2-catalyzed Mg(NH2)2 + 2LiH system

Valentoni, Antonio;ENZO, Stefano;MULAS, Gabriele Raimondo Celestino Ettore;GARRONI, Sebastiano
2015

Abstract

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.
Kinetic improvement on the CaH2-catalyzed Mg(NH2)2 + 2LiH system / Torre, Francesco; Valentoni, Antonio; Milanese, Chiara; Pistidda, Claudio; Marini, Amedeo; Dornheim, Martin; Enzo, Stefano; Mulas, Gabriele Raimondo Celestino Ettore; Garroni, Sebastiano. - In: JOURNAL OF ALLOYS AND COMPOUNDS. - ISSN 0925-8388. - 645:S1(2015), pp. 33021.S284-33021.S287. [10.1016/j.jallcom.2014.12.228]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/162611
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