Ammonia production using iron nitride and water as hydrogen source under mild temperature and pressure |
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Authors: | Hiromi Eba Yuki Masuzoe Toru Sugihara Hayao Yagi Tian Liu |
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Affiliation: | Faculty and Graduate School of Science and Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan |
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Abstract: | Ammonia generation was studied in the reaction between water and nitrogen-containing iron at 323 K and atmospheric pressure. Similar to metallic Fe, the interstitial compound Fe3N reduced water through Fe oxidation to produce hydrogen gas, while the N combined with atomic hydrogen to produce ammonia as a byproduct. The addition of carbon dioxide to this system accelerated the reaction with concomitant consumption of carbon dioxide. The promoted ammonia production upon addition of carbon dioxide can be attributed to the generation of atomic hydrogen from the redox reaction of carbonic acid and Fe, as well as removal of used Fe from the reaction system through the formation of a soluble carbonato complex. When carbonate was added to the reaction system, the production rates of ammonia and hydrogen increased further. The results here confirmed that ammonia can be synthesized from iron nitride under mild conditions by utilizing carbon dioxide. |
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Keywords: | Ammonia production Carbon dioxide Carbonic acid Iron and steel Iron nitride Iron carbonate |
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