Download Catalysts for Hydrogen Storage and more Study notes Chemistry in PDF only on Docsity! Catalysts for Hydrogen Storage Hydrogen is a form of storable chemical energy that can supplement intermittent renewable energy conversion. Effective processing and storage methods are the key factors that need to be resolved to achieve hydrogen economy. Application of Catalysts in Hydrogen Storage • Catalysts for Compound chemical hydrogen compound material Such materials are mainly composed of light alkali metals and alkaline earth metals (such as Li, Na, K, Al, etc.) and non-metallic elements such as B and N. Among them, due to its high hydrogen capacity, large amount of availability and low cost, the lightweight composite hydride NaAlH4 is a potential solid hydrogen storage material. Studies have found that the introduction of catalysts can improve the dehydrogenation performance of NaAlH4, lower the decomposition temperature, improve the kinetics and reduce the activation energy. Figure 1. Catalyst addition and resultant dehydrogenation rate [1] • Catalysts for Liquid organic hydrogen storage material Such materials usually use the unsaturated bonds of the molecules themselves to undergo catalytic hydrogenation reaction with hydrogen, and use the reverse process to achieve catalytic dehydrogenation. N- ethylcarbazole is an organic liquid hydrogen storage material found to be completely hydrogenated/dehydrogenated with a dehydrogenation temperature below 200 °C. Since the hydrogenation of polyaromatic compounds is a thermodynamically exothermic process, it is relatively easy to fully catalyze the hydrogenation reaction. Therefore, the research on catalysts mainly focuses on the dehydrogenation step. The catalytic processes are divided into homogeneous or heterogeneous (such as Ru, Pd nanoparticles supported by oxides or carbon materials). For example, a high-efficiency N-ethylcarbazole dehydrogenation catalyst can be prepared by using a metal heterogeneous catalyst supported by carbon-nitrogen materials. Figure 2. Hydrogen release amount for 12H-NEC on different catalysts [2] • Catalysts for Methanol/formic acid hydrogen storage
