Optimalizace obsahu Cs a Na promotoru ve směsném Co-Mn-Al oxidu

Abstract

In the scope of this diploma thesis there was prepared a set of Co-Mn-Al mixed oxides (molar ratio Co:Mn:Al = 4:1:1), modified by various quantity of sodium and cesium, by impregnation method. Samples were characterized by chemical analysis, physical adsorption of nitrogen, ray powder diffraction, electron scanning microscopy, temperatureprogrammed reduction by hydrogen and were also tested for catalytic decomposition of nitrous oxide. There were made measurements of temperature dependence on N2O conversion in the temperature range 270-450°C in inert gas and further there was examined the influence of oxygen, water vapour and nitric oxide in the feed on conversion of nitrous oxide. The measurements confirmed the inhibition of oxygen, water vapour and nitric oxide on the reaction rate of N2O decomposition. It was discovered that a higher conversion of N2O was reached in the presence of catalysts modified by Cs. Further there was observed the influence of calcination temperature and type of salt (CsNO3, Cs2CO3) used in impregnation of Co-Mn-Al mixed oxide. It was discovered that the calcination temperature doesn’t have a significant influence on obtained conversion of N2O. Higher conversion of N2O presence of oxygen, water vapor and nitric oxide was achieved by the Co-Mn-Al mixed oxide impregnated Cs2CO3 solution.