:—Behaviors of NO in NO-O2-N2 mixture under a low pressure mercury lamp irradiation—

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The behaviors of NO in NO-O2-N2 mixture under a low pressure mercury lamp irradiation were studied at room temperature. NO was oxidized to NO2 and higher oxides. The initial reaction rate was proportional to the square of O2 concentration and the square root of NO concentration and decreased during the course of the reaction because of a retardation by NO2. The initial rate of the reaction under the constant concentration of O2 was expressed by the following equation: -d [NO] /dt=k2 [NO] 1/2/ {1+k'2 ( [NO] o- [NO] ) / [NO] } The order of the reaction of NO decreased gradually as the proceeding proqress of the reaction. The reaction rate of NO was remarkably accelerated by the presence of H2O. NO reacted with O3 and was oxidized rapidly to higher oxides in the dark reaction in NO-O3-O2-N2 mixture. The effect of O3 in the oxidation of NO decreased a little under a high pressure mercury lamp irradiation because of the reductive decomposition of NO2 formed. While the effect increased remarkably by a low pressure mercury lamp irradiation and O3 oxidized several times of the amounts of NO to NO2.
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