Behavierour of NO in NO-N₂ mixture under a UV irradiation was a studied with a flow type pho-toreactor at room temperature. NO did not change in NO-N₂ mixture under a high pressure mercury lamp irradiation but decomposed to N₂ and O₂ under a low or super low pressure mercury lamp irradiation and 10% of NO was oxidized to NO₂ by O₂ formed.
On the other hand, NO₂ decomposed to NO and O₂ in NO₂-N₂ mixture and NO formed was partially decomposed to N₂ and O₂ under a low pressure mercury lamp irradiation. The oxidation rate of NO to NO₂ was accelerated by the presence of small amount of O₂, while the decomposition rate of NO was not. And the reaction was retarded by the presence of NO₂. The rate under a low pressure mercury lamp irradiation was remarkably decreased during the course of reacti on. The rate was expressed by the following equation:
-d[NO]/dt=k_o[NO]^1/2/1+k'[NO₂]/[NO]

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