NOx absorption from air streams using aqueous sodium hydroxide and hydrogen peroxide solutions

Control of Nitrogen oxide (NOx) emissions is of increasing importance to and presents special problems for batch process sources. These sources typically generate varying amounts of NOx which in conjunction with a varying NO to NO₂ ratio causes the removal of NOx from these streams to be complicated.

Models for NOx absorption into water, aqueous Sodium hydroxide and aqueous Hydrogen peroxide were developed for evaluation for a optimal absorption solution. The Sodium hydroxide and Hydrogen peroxide models both showed an improvement over the use of water for the absorption media. Comparison of the results from the models indicate that the Sodium Hydroxide solution would be preferred for NOx levels above 5 * 10^-4 atm. Below this level the Hydrogen peroxide solution would be recommended. Results obtained from the model for NOx absorption into water were found to match well with experimental data.