A method for synthesizing an alkali metal hydride

Abstract

This invention discloses a method for synthesizing alkali metal hydrides, comprising the following steps: selecting a liquid organic hydrogen carrier as a hydrogen source and dispersant, adding the alkali metal to be hydrogenated and a dehydrogenation catalyst, and mixing them uniformly to form a solid-liquid mixture; placing the solid-liquid mixture in a reaction vessel, removing the air from the reaction vessel, and stirring and heating the solid-liquid mixture under vacuum, an inert gas atmosphere, or a hydrogen atmosphere to carry out a hydrogenation reaction; after the hydrogenation reaction is completed, a solid-liquid mixture product is obtained; the reaction vessel is cooled to room temperature; the solid-liquid mixture product in the reaction vessel is sieved, with the sieve size smaller than the particle size of the dehydrogenation catalyst; the dehydrogenation catalyst is recovered from the sieve; and the sieved solid-liquid mixture product is separated into solid alkali metal hydrides and liquid organic hydrogen carrier by filtration or centrifugation. Using a liquid organic hydrogen carrier for the hydrogenation of alkali metals improves the synthesis efficiency of alkali metal hydrides and reduces their synthesis cost.

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