Studium vlivu procesních podmínek na přímý katalytický rozklad NO.

Abstract

In this bachelor thesis, the effect of O2, CO2 and H2O in the reaction gas on the activity of potassium modified Co-based mixed oxide catalysts used for the direct catalytic decomposition of NO was studied. Four catalysts were prepared, which were shown in previous studies to have suitable physico-chemical and catalytic properties for the decomposition of NO in inert gas. Their physico-chemical properties were studied by atomic absorption spectrometry, X-ray powder diffraction, physical nitrogen sorption and temperature-programmed desorption of NO. Furthermore, their catalytic activity was monitored in the presence of oxygen (0-5 mol.%), carbon dioxide (0-5 mol.%) and water vapour (0-2 mol.%) and the results were compared with those from catalytic tests in inert. The measured data showed that the presence of O2, CO2 and H2O in the reaction gas decreased the catalytic activity of Co-based mixed oxides modified by K. There was a gradual decrease in activity with increasing amounts of other components in the reaction gas. The biggest decrease was observed in the presence of oxygen and CO2, while the least effect was due to water vapor. At the same time, an increase in the concentration of NO2 as a by-product of the reaction was observed.