Abstract
In order to make explanation of NOx absorption mechanism into water, we assume the numerical simulation model. This model based upon chemical reactions in aqueous solution is calculated numerically by applying the Runge-Kutta method. The calculated results agree with the experimental values on both static and dynamic characteristics. And the absorption-controlling rate can be obtained by using the characteristic time. The result of analysis is as follows; 1) NO_2 absorption is under chemical reaction control. As for NO, however, it is changed from chemical to physical desorption control as NO/NO_x increases. 2) The reaction path is changed by NO/NO_x. Especially if NO/NO_x equals 100%, oxidation of NO with dissolved oxygen becomes the rate-determining step. 3) The absorption characteristics does not depend on NO_x ion concentration. Under acid conditions the removal efficiency decreases as acidity increases.
