Journal
CHEMOSPHERE
Volume 61, Issue 4, Pages 573-578Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2005.03.011
Keywords
reaction pathway; preferential or selective formation of nitrogen; ammonium and nitrite ions; catalytic wet oxidation; ammonia
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The role of catalyst and the reason for the preferential formation of N-2 in the catalytic oxidation reaction of ammonia in water over a Ru (3 wt.%)/TiO2 catalyst were elucidated. It was verified that the catalyst in the reaction had no direct relevance to the selective formation of N-2, but was responsible only for the oxidation of aqueous ammonia, NH3(aq), finally giving a molecule of nitrous acid. The preferential production of N-2 was experimentally demonstrated due to the homogeneous aqueous phase reaction of the nitrous acid-dissociated NO2- with NH4+ ions. Even under the highly oxidizing condition, NO2- was much more likely to react with NH4+ to form N-2 than being oxidized over the catalyst to NO3- as long as NH4+ was available in solution. (C) 2005 Elsevier Ltd. All rights reserved.
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