Journal
THIN SOLID FILMS
Volume 516, Issue 13, Pages 4446-4451Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2007.10.053
Keywords
ammonia synthesis; atmospheric non-equilibrium plasma; microwave discharge; quenching gas injection
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This paper reports the synthesis of ammonia from nitrogen and hydrogen as a model reaction in atmospheric microwave plasma. From the obtained results, we then investigate the effects of hydrogen addition to a plasma gas and hydrogen injection into the afterglow region of the plasma on ammonia production. The results showed that the addition of hydrogen to a plasma gas depressed nitrogen activation in the plasma. Hydrogen injection into the afterglow region of the plasma enhanced ammonia production. Dilution of a plasma gas with argon was effective for promoting the formation of active nitrogen species, resulting in the enhancement of ammonia production. The results suggest that active nitrogen species played a key role in ammonia production using atmospheric microwave plasma. (c) 2007 Elsevier B.V. All rights reserved.
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