Selective wet-air oxidation of diluted aqueous ammonia solutions over supported Ni catalysts.
Wet-air oxidation (WAO) of diluted aqueous ammonia solutions over Ni supported on Al(2)O(3) catalysts was investigated. A nitrogen selectivity of approximately 90% was achieved by the WAO of ammonia over the 20-wt% Ni/Al(2)O(3) catalyst at 503K, a reaction time of 2h and air-feed pressure of 2.0MPa without the dissolution of Ni during the reaction. Ni/Al(2)O(3) pretreated by calcinations in air at 1173K for 4h showed high stability due to the formation of a NiAl(2)O(4) phase.
Kaewpuang-Ngam
Sutasinee
S
Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan.
Inazu
Koji
K
Kobayashi
Takaaki
T
Aika
Ken Ichi
KI
D000641:Ammonia / Q000737:chemistry* / Q000302:isolation & purification*; D002384:Catalysis; D005068:Eutrophication; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
D000641:Ammonia; D009532:Nickel