Hydrogen energy,as a clean and environmentally friendly renewable energy source,is attracting worldwide attention.However,the extremely low volume energy density and the flammable and explosive characteristics of hydrogen bring difficulties and dangers to large-scale storage and transportation of hydrogen.Ammonia is a kind of carbon-free hydrogen carrier,which not only has high volume and mass energy density,but also has mature storage and transportation technology.On-site hydrogen production from ammonia can solve the problems of hydrogen storage and transport,so ammonia hydrogen storage from ammonia is attracting a lot of attention.Currently,the most efficient catalyst for ammonia decomposition is ruthenium-based catalysts,but it can not be used in large scale because of its high price.Among the non-precious metal-based catalysts,Ni-based catalysts have the highest activity and relatively low cost,which are considered to have great application potential.However,Ru-based and Ni-based catalytic systems still have some challenges in terms of activity and stability.In this paper,the latest research progress of ammonia decomposition catalysts,including catalysts based on Ru,catalysts based on non-precious metals Fe and Ni,and bimetallic catalysts,and the reaction mechanism of ammonia decomposition in recent literature were reviewed.
hydrogen energyammonia decompositionruthenium catalystnon-precious metal catalystsmechanism
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