:—photo-reaction in NO-NH3-O2-N2 system—

概要

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The behaviors of NOx and NH3 in the UV reaction of NO-NH3-O2-N2 mixture were studied at room temperature. The decomposition rate of NH3 under a high pressure mercury lamp irradiation was proportional to the concentration of NH3 and was not affected by the presence of NO and O2. NO reacted with NH2 formed by the dissociation of NH3 to form N2 and was partially oxidized to NO2. A small amount of N2O formed as by-product similarly in the case of the absence of NO. The decomposition rate of NOx was nearly equal to that of NH3. Under a low pressure mercury lamp irradiation, the decomposition rate of NH3 increased by the presence of NO and O2. The rate increased with the increasing of the concentration of O2. The promotion effect of NO on the NH3 decomposition decreased with the increasing of the concentration of O2, while no effect of NO was observed at 10 % of O2. About 22 % of NH3 changed to N2O at 10 % of O2 and a part of NO was oxidized to NO2. NO reacted mainly with NH3 and decomposed to N2 and H2O rapidly. The initial decomposition rates of NH3 and NOx under a low pressure mercury lamp irradiation were 10 times larger than those under a high pressure mercury lamp irradiation, and the decomposition rate of NH3 was about 1.3 times of that of NOx because of the change to N2O.
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