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

Mao Akiyama, Keigo Aihara, Tomiko Sawaguchi, Masahiko Matsukata, Masakazu Iwamoto*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)14493-14497
Number of pages5
JournalInternational Journal of Hydrogen Energy
Issue number31
Publication statusPublished - 2018 Aug 2


  • Ammonia decomposition
  • Applied power
  • Clean hydrogen
  • Hydrazine
  • Plasma

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology


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