A mathematical model was developed for the isothermal absorption of nitrogen oxides into nitric acid solutions containing hydrogen peroxide. This model, based on the two-film theory of absorption with chemical reactions, includes diffusive transport and equilibrium between species in the gas phase and simultaneous absorption of the NOx components with fast irreversible reactions in the liquid phase. Kinetic parameters relative to the absorption of the different NOx species were determined at increasing acidities and for a low concentration of H2O2 from test runs performed in a small packed column at 20 °C and atmospheric pressure for various NOx partial pressures up to 500 Pa and the whole range of NOx oxidation ratios. Only the parameter relative to trivalent NOx was found to increase with the HNO3 molarity, the other ones remaining constant. Interpretation of the experimental results according to the model showed that the hydrolysis is the main controlling step for tetravalent nitrogen oxides and that a...

Modeling of NOx Absorption into Nitric-Acid Solutions Containing Hydrogen-Peroxide

A mathematical model previously developed by us for the absorption of NOx into nitric acid solutions containing hydrogen peroxide at 20 °C was adapted to take the effect of temperature into account. It was used to determine at 10 and 30 °C the overall kinetic parameters relative to the absorption of the different NOx species, for increasing HNO3 molarities (up to 2 M) and a low concentration of H2O2 (0.02 M), from test runs performed in a small packed column. The interpretation of the experimental results obtained at 10 and 30 °C according to the model confirmed the previous findings:  hydrolysis is the main controlling step for tetravalent nitrogen oxides, and nitrous acid is likely to contribute for the most part to the absorption of trivalent species.

Effect of temperature on NOx absorption into nitric acid solutions containing hydrogen peroxide

Cold DeNOx development for oxyfuel power plants

The absorption of NO x (IV) into nitric acid solutions containing a low concentration of hydrogen peroxide was studied in a small packed column. A simple mathematical model developed for this absorption was used for the determination of kinetic parameters relative to NO 2 and N 2 O 4 in such solutions. Results obtained at 10, 20, 30°C lead to the same interpretation: hydrolysis is the main controlling step for tetravalent nitrogen oxides absorption and there is no sensible effect of the acidity on the absorption efficicency. Hydrogen peroxide, however, plays an essential role in solution by preventing the HNO 2 decomposition. The mechanistic and kinetic findings were validated as the model has worked with fair success in predicting NO x removal efficiencies in a pilot-scale packed column.

Removal of tetravalent NOx from flue gases using solutions containing hydrogen peroxide

Kinetik der Absorption von Stickstoff(IV)-oxid bei kleinen Partialdrücken

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Kinetik der Absorption von Stickstoff(IV)-oxid bei kleinen Partialdrücken