Kinetic models of ozone decomposition mechanisms in aqueous solutions as sources of oxygen-containing HO2• and HO• radicals

Abstract

Oxygen-containing HO•2 and HO• radicals are one of the most effective and environmentally friendly oxidants, one of the sources of which are ozonated aqueous solutions, the mechanism of the processes occurring in them has not yet been precisely established. The purpose of the work is to compare, to confirm or refute, mechanisms proposed by S.D. Razumovsky and H.S. Stolyarenko as the most modern ones based on the processes of suppressing the formation of “thermal” nitrogen(II) oxides during fuel combustion. For this, changes in the concentration of all compounds involved in ozone destruction processes in aqueous solutions and the effect of these compounds on the formation of “thermal” nitrogen oxides have been investigated using a kinetic mathematical model. During the study, kinetic mathematical models of the process of suppressing the formation of “thermal” nitrogen(II) oxides during fuel combustion using the process of ozone destruction in aqueous solutions have been obtained according to mechanisms proposed by S.D. Razumovsky and H.S. Stolyarenko. Based on the results of the comparison of both mechanisms, it can be stated that the mechanism of H.S. Stolyarenko more realistically reflects the process of decomposition of ozone in aqueous solutions. The dependences of changes in the concentration of substances that participate in the process of decomposition of ozone in aqueous solutions on time, as well as the amount of ozone consumed for this process have been determined. Establishing of the mechanism of ozone destruction in the same solutions and the obtained dependencies will make it possible to more freely use oxygen-containing HO•2 and HO• radicals, which are formed during the destruction of ozone in the same solutions, for the processes of gas flows cleaning, especially for their denitrification, as well as for the intensification of oxidation processes in chemical industry, for example, in the production of nitric acid