Визначення стабільності нанесеного платинового каталізатора селективного відновлення оксидів нітрогену

Abstract

Іn the article we present research results of the activity change by platinum catalyst of selective catalytic reduction (SCR) NOx from the operating time. We propose the method of determining the stability of the catalyst relying on the correlation between the size of crystallite and activity of catalysts. We demonstrate the results of deactivation velocity of different catalysts with respect to time. Based on data of fluorescence analysis and electron microscopy analysis, we demonstrate physico-chemical characteristics of the novel catalyst and samples with various operating time. We define causes of decreased activity of developed catalysts, as well as uncover the results of comparative analysis with other research data. Based on experimental data, we develop mathematical models showing how the decrease of catalysts activity depends on the crystallites size of catalytically active substance. Finally, this technique can be applied to predict the time operation of developed catalysts.