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The absorption of dilute NO x gas was studied, at atmospheric pressure, in an industrial column packed with 25-mm plastic Pall rings. The scrubbing liquid was a dilute hydrogen peroxide solution. NO x removal efficiencies of 75−91% were obtained for gas mixtures with partial pressures of NO x in the range of 62.8−460 N/m2. A model was developed on the basis of equilibrium, chemical reactions, mass transfer in gas and liquid phases, and consideration of HNO2 and NO oxidation by H2O2 in the liquid phase. The removal efficiencies calculated using this model fairly agreed with the experimental data. The HNO2 formation in the gas phase largely determines the NO x absorption rate. Its oxidation by H2O2 improves the NO x removal. The influences of various parameters in the NO x removal efficiency are discussed from numerical simulations.

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