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Issue 3, 2018
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Excitation of H2O at the plasma/water interface by UV irradiation for the elevation of ammonia production

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Abstract

Ammonia is well known to be a very important chemical substance for human life. Simultaneously, the conventional ammonia production process needs pure nitrogen and pure hydrogen. Hydrogen has been produced from either liquid natural gas (LNG) or coal. In this study, water is used as a direct hydrogen source for ammonia production, thereby obviating the need for catalysts or water electrolysis. We have studied and developed a plasma/liquid interfacial reaction (P/L reaction) that can be used to produce ammonia from air (nitrogen) and water at ambient temperature and pressure, without any catalysts. In this study, the P/L reaction entails enhanced ultraviolet (UV) irradiation of the surface of the water phase. The nitrogen plasma/water interface reaction locus can produce ammonia. In contrast, the vacuum ultraviolet (VUV) irradiated interface reaction locus produces increased amounts of ammonia. In a spin trap electron spin resonance (st-ESR) experiment, large amounts of atomic H (H˙) were produced by UV irradiation, especially by VUV irradiation. The derived H˙ effectively enhanced the P/L reaction rate.

Graphical abstract: Excitation of H2O at the plasma/water interface by UV irradiation for the elevation of ammonia production

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Article information


Submitted
05 Oct 2017
Accepted
05 Dec 2017
First published
06 Dec 2017

Green Chem., 2018,20, 627-633
Article type
Paper

Excitation of H2O at the plasma/water interface by UV irradiation for the elevation of ammonia production

T. Sakakura, S. Uemura, M. Hino, S. Kiyomatsu, Y. Takatsuji, R. Yamasaki, M. Morimoto and T. Haruyama, Green Chem., 2018, 20, 627
DOI: 10.1039/C7GC03007J

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