DEVELOPMENT OF A REACTOR FOR LOW-TEMPERATURE CATALYTIC REDUCTION OF NITROGEN OXIDE EMISSIONS AT NITROGEN-FERTILIZER ENTERPRISES

Abstract

The article presents the development of a more efficient use of the processes of catalytic reduction of nitrogen oxides of gas emissions for industrial use. The advantages of plate catalyst blocks with a deposited active substance in comparison with industrial granular aluminum-vanadium catalysts are presented. Chemical and kinetic regularities of this process are shown. It is noted that the use of plate deposited catalysts based on noble metals is a more effective means of reducing nitrogen oxides than granular ones due to the presence of low hydraulic resistance and increased activity. On the basis of experimental data of laboratory and pilot studies of the developed catalyst obtained by impregnating the applied metal carrier based on TiO2 with salts of platinum group metals, physicochemical and kinetic calculations of the process of reduction of nitrogen oxides using ammonia were carried out. Graphical dependencies of the activity of the developed catalysts on the process temperature and volume velocity are given. The optimal values of these indicators have been determined. It is shown that the effect of temperature is explained by the growth of the reaction rate constant in proportion to the temperature according to Arrhenius' law, and the effect of the volumetric velocity is associated with a change in the duration of contact of the reacting components with the active surface of the catalyst. The calculation of the Reynolds criterion was carried out, which showed that this process in the conditions of industrial technologies is characteristic of the laminar regime. It is noted that the use of the developed catalyst in production provides an expansion of the temperature range of the emission purification process, it is more suitable for operation in industry in accordance with the determined optimal conditions of its application.