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Cathodic Contact Glow Discharge Electrolysis for the Degradation of Liquid Ammonia Solutions
Author(s) -
Allagui Anis,
Brazeau Nicolas,
Alawadhi Hussain,
Almomani Fares,
Baranova Elena A.
Publication year - 2015
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.201400049
Subject(s) - electrolysis , glow discharge , ammonia , chemistry , vaporization , cathode , cathodic protection , inorganic chemistry , radical , plasma , analytical chemistry (journal) , degradation (telecommunications) , electrode , electrochemistry , environmental chemistry , organic chemistry , telecommunications , computer science , physics , quantum mechanics , electrolyte
The application of 50 VDC cathodic contact glow discharge electrolysis for six hours in 1.0 mol/L KOH + 0.8, 0.4 and 0.08 g/L ammonia results in the removal of 66, 71 and 77% of ammonia, respectively, following pseudo first‐order kinetics at ca. 0.3 mol/kWh. The yields of dissolved NO 2 N and NO 3 N lie between 9 and 29% and are coupled with ammonia removal suggesting a nitrification process. Based on the near‐cathode UV–Vis emissions and ionization products of H 2 O and NH 3 molecules, a mechanism is proposed along with the charge/energy transfer reactions between the plasma‐generated free radicals and ionic species. Joule heating and vaporization are also believed to physically remove ammonia.