Dehydrogenation properties of hydride‐hydroxide systems containing potassium

Abstract

In this research, dehydrogenation properties of several hydride-hydroxide systems containing KH and KOH have been evaluated. Six types of hydridehydroxide systems (KH-M[OH] n , MH m -KOH, M: Li, Na, Mg) were prepared by ball milling method. We expected reaction formula of these six systems with assumption, that is, oxides would form after dehydrogenation. The hydrogen desorption properties of these systems were evaluated by TG-DTA and MS. From the results of XRD before and after dehydrogenation, we obtained actual reaction formulas, which were different from expected formulas.Among six systems, it was confirmed that only KH-LiOH system dehydrogenated in endothermic. This means that KH-LiOH system can reversibly ab/desorb hydrogen in principle. However, it is calculated that extremely high pressure of GPa order is required for rehydrogenation of KH-LiOH system.

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“…The authors report when desorption temperature is decreased the desorption kinetics of NaAlH 4 is enhanced with the addition of 10 wt% of spherical SrTiO 3 catalyst. 17 Dehydrogenation properties of hydride-hydroxide systems containing potassium were discussed by Noto et al 18 In this article, the dehydrogenation properties of several hydride-hydroxide systems containing KH and KOH have been evaluated. Six types of hydride-hydroxide systems (KH-M[OH] n , MH m -KOH, M: Li, Na, Mg) were prepared by ball milling method.…”