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The study investigated the reactive dissolution of gas phase nitrogen-oxides and ozone in water. Mixtures with variable composition of nitrogen oxides were produced by mixing nitric oxide (NO) with ozone. Pure NO in Ar carrier gas resulted in the production of NO2− but its production rate was limited by low NO solubility. The presence of NO2 in the gas increased the production of NO2− while NO3− was also produced. The presence of N2O5 in the gas abruptly increased the production of NO3− due to higher solubility of N2O5. In the present configuration, about 8% of NO2 was dissolved in the water while for N2O5 the fraction was 78%. [ABSTRACT FROM AUTHOR]

Environmental decontamination is a major challenge due to the rapid growth of industrial and technological development, requiring an important consumption of fossil energies. Nowadays, a new way to treat polluting molecules based on the use of nonequilibrium reactive plasmas, is under development. These plasmas are generated by electrical discharges at atmospheric pressure, for neutralizing or transforming the toxic oxides. In this respect, the goal of the present work is to analyze the possibilities of treatment of NOx molecules and ozone generation by pulsed discharge. The study was carried out by using a one-dimensional model based on the parallel resistor network concept, consisting in dividing the discharge volume into plasma elements which are connected in no way but through their contribution to the total resistance of the plasma. The model calculations indicate the effect of gas heating and inhomogeneous preionization on the ozone production and NOx destruction. [ABSTRACT FROM AUTHOR]

This paper describes the influence of gas pressure on the conversion of O2 to O3 and the ozone production efficiency in a multichannel dielectric barrier discharge (DBD) reactor utilizing positive and negative pulses. Results show that conversion of O2 to O3 is continuously enhanced by the increase of gas pressure (0.1-0.24 MPa) while the rising speed of oxygen conversion with the increasing gas pressure at fixed specific input energy is reduced above 0.15 MPa. The maximum ozone generation efficiency is increased with increasing gas pressure (0-0.2 MPa) while positive pulse exhibits higher energy efficiency. The maximum ozone generation efficiency is suppressed with further increase of gas pressure (0.2-0.24 MPa) while no significant difference in ozone generation efficiency is observed for two unipolar pulse modes. Results also show that 0.2 MPa is the optimal working gas pressure to obtain the maximum ozone generation efficiency and increasing gas pressure would lead to remarkable increase of ozone generation efficiency for ozone production at high energy densities in multichannel DBD. [ABSTRACT FROM AUTHOR]