Abstract
Alkali metal amide and imide systems especially NaNH2 and Li2NH have recently been proposed as a catalyst for NH3 cracking. This finding ignites the interest of researchers worldwide to study amide–imide/amide–hydride systems. Although these systems have shown catalytic properties toward NH3 cracking and have also been proposed as a hydrogen storage material, the decomposition mechanism of sodium amide is still unclear due to the complexity and low melting point of NaNH2. Herein, pure NaNH2 and its composite with lithium hydride as well as sodium hydride in a molar ratio 1:1 has been investigated, and a detailed mechanism associated with their decomposition has been suggested. The sodium amide–lithium hydride system is found to be analogous to lithium amide–sodium hydride. It desorbs 4 wt % H2 through cation exchange in a temperature range of 25–200 °C followed by NH3 mediated reaction in the temperature range 200–400 °C. The desorbed product can be rehydrogenated at around 200 °C under 2.0 MPa. An import...
Published Version
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