Effect of Liquid Properties on Nitrogen Dioxide Absorption

Abstract

To inhibit nitrate synthesis during the absorption process of nitrogen dioxide, we experimentally examined the effects of the initial pH, ionic strength, and reductant on the absorption rate, absorption efficiency, and selectivity. In this experiment, we fed a mixed gas, which contained nitrogen dioxide, through a bubble-column batch-type absorbing apparatus, and measured the concentrations of nitrite and nitrate in the absorbing solution. The results indicate that the higher the initial pH and ionic strength of the absorbing solution, the greater the absorption rate, and thereby, the greater the suppression of nitrate synthesis. Furthermore, adding sodium sulfite to the absorbing solution resulted in an abundance of the nitrite.