Ammonia decomposition to clean hydrogen using non-thermal atmospheric-pressure plasma

• Published in: International journal of hydrogen energy Vol. 43; no. 31; pp. 14493 - 14497
• Main Authors: Akiyama, Mao, Aihara, Keigo, Sawaguchi, Tomiko, Matsukata, Masahiko, Iwamoto, Masakazu
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 02-08-2018
• Subjects: Ammonia decomposition; Applied power; Clean hydrogen; Hydrazine; Plasma; Plasma; Hydrazine; Applied power; Ammonia decomposition; Clean hydrogen
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2018.06.022

The plasma decomposition of ammonia was studied as a function of applied voltage/power, residence time including length of an inner electrode and flow rate of reactant gases, partial pressure of ammonia, and amount and the metal species of the inner electrodes. The ammonia decomposition rates were in excellent agreement with the hydrogen production rates and no hydrazine production was detected, indicating the clean decomposition of ammonia in the current system. The decomposition rates were dependent on the applied power and the residence time and independent of metal species of the inner electrodes, in contrast to the strong dependence of the ammonia synthesis reaction on the metal species. A hydrogen yield of 100% was achieved with an applied power of approximately 50 W and a residence time of 1.2 s at ambient temperature and atmospheric pressure, with an applied voltage of 5 kV and a frequency of 50 kHz.
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•The plasma decomposition of ammonia without hydrazine by-production.•Full decomposition was achieved at ambient temperature and atmospheric pressure.•The reaction rates were dependent on the applied power and the residence time.