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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