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Atmospheric‐pressure nonthermal plasma synthesis of ammonia over ruthenium catalysts
Author(s) -
Kim HyunHa,
Teramoto Yoshiyuki,
Ogata Atsushi,
Takagi Hideyuki,
Nanba Tetsuya
Publication year - 2017
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201600157
Subject(s) - ruthenium , catalysis , nonthermal plasma , atmospheric pressure , ammonia , plasma , ammonia production , chemistry , nitrogen , atmospheric pressure plasma , hydrogen , analytical chemistry (journal) , inorganic chemistry , volume (thermodynamics) , metal , nuclear chemistry , organic chemistry , physics , oceanography , quantum mechanics , geology
Atmospheric‐pressure nonthermal plasma was used to synthesize ammonia from nitrogen and hydrogen over ruthenium catalysts. Formation of NH 3 in a N 2 ‐H 2 mixture altered the plasma characteristics due to the low ionization potential of NH 3 (10.15 eV). The optimum gas ratio was found at N 2 :H 2 = 4:1 by volume (i.e., N 2 ‐rich conditions). When plasma was operated at a temperature below 250 ° C, the NH 3 concentration increased linearly with increasing specific input energy (SIE). For the Ru(2)‐Mg(5)/γ‐Al 2 O 3 catalyst at 250 ° C, pulse energization was four times more efficient than the AC energization case. The presence of RuO 2 was found to be beneficial for the NH 3 synthesis via plasma‐catalysis. The addition of a small amount of O 2 was found to be effective for the in situ regeneration of the deactivated catalyst. The effect of metal promoters was in the order of Mg > K > Cs > no promoter.