With the development of hydrogen fuel cell vehicles, it is increasingly important to find safe and efficient hydrogen storage materials. Scientists in China have found that the lithium imino compound (Li2NH) shows excellent catalytic activity for hydrogen production from ammonia decomposition when combined with iron nitride, which provides a new idea for safe hydrogen storage and hydrogen storage. The relevant papers were published online in the latest edition of the German Journal of Applied Chemistry.
Ammonia has a high hydrogen content (17.7%), a high energy density (4 kilowatt-hours per kilogram), and easy storage. It does not produce carbon monoxide and carbon dioxide during transportation and decomposition, so ammonia is considered to have Potential application of new energy carriers. These features have greatly increased the interest of researchers in it. In this new type of energy carrier, hydrogen production by catalytic decomposition of ammonia is an important part.
Recently, the research team led by Professor Chen Ping of the Department of Hydrogen Energy and Advanced Materials of the National Institute of Clean Energy of the Dalian Institute of Chemicals, Chinese Academy of Sciences, found that the lithium imino compound combined with iron nitride exhibited excellent catalytic activity for ammonia decomposition. Under the same reaction conditions, such as 450 °C, the activity of the composite catalyst system (convert 9.7 grams of ammonia per gram of catalyst per hour) compared to supported iron-based catalyst (0.74 grams of ammonia per gram of catalyst converted per hour) or nitriding Iron (0.4 grams of ammonia per gram of catalyst converted per hour) is an order of magnitude higher.
Based on this discovery, the research group further developed a new ammonia decomposition catalyst system, namely a composite catalytic material system of lithium imide and a third-cycle transition metal or its nitride, which not only explained the alkali metal auxiliaries from a new perspective. The role also provides new ideas for the design of high-efficiency catalysts, especially for the replacement of noble metal catalysts.
At present, researchers are further optimizing the preparation and catalytic performance of such materials and hope to be able to use it with fuel cell systems in the near future.
This work has been funded by the National Outstanding Youth Fund and Natural Science Fund. (Reporter Li Daqing)
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