The behaviors of nitrogen oxides in air under the dark reaction in the presence of NH
3 were studied at room temperature. N
2O and NO did not react with NH
3in N
2and air. NO
2reacted with NH
3in N
2to produce small amounts of NO and finely powdered white material. The molar ratio (NH
3/NO
2) of the product was found to be 1.0-1.5. The IR spectra of the product showed the similar band with NH
4NO
3and NH
4NO
2. The decreasing rate of NO
2was proportional to the square of [NO
2] and increased remarkably with the increase of [NH
3] and reached to a constant value with excess amounts of NH
3. The oxidation rate of NO in air was not affected by the presence of NH
3. NO
2formed gradually by the oxidation of NO in the early stage, and decreased by the reaction with NH
3in later stage. The decreasing rate did not affect by the presence of O
2but the formation of NO decreased. The formation of NO in the dark reaction in NO
2-NH
3-N
2 and NO
2-NH
3-air mixtures increased by the presence of H
2O and the decreasing rate of NO
2decreased a little.
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