Mixed Non Noble/Noble Catalytic Interfaces for Ammonia Decomposition at Lower Temperature
Résumé
Hydrogen is considered as one future energy vector due to its high mass energy density. However, its low energy density by volume (8 MJ.L -1 ) makes it difficult to store and distribute. Hydrogen carriers, able of absorbing and releasing it through different chemical reactions, can be used to densify it. Ammonia is a promising decarbonated carrier of hydrogen, due to its high hydrogen mass fraction (17.8 wt%) and its easy liquefaction. [1] However, the required high pressure and high temperature, for synthesis and decomposition, affects the overall energetic efficiency of the storage process. In this work, we are interested in the catalyzed decomposition reaction of ammonia aiming to regenerate hydrogen. Ruthenium, one of the reference metal catalysts for working in milder conditions, cannot be considered on an industrial scale because of its high cost and limited abundance. Other catalytic systems, such as alkali or alkaline-earth metal amides, present competitive catalytic performance with minimal cost. In particular, lithium amide (LiNH2) when coupled with other transition metals (TM). [2] From a joint experimental and theoretical investigation of LiNH2 -TM based catalytic systems, we propose to address this difficult question of understanding and improving the efficiency of these catalytic systems.
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