Katalytický rozklad jako možnost snížení emisí NO

Abstract

Diploma thesis is focused on the study of the effect of preparation method and calcination temperature on catalytic (activity, stability) and physico-chemical properties of catalyst for direct NO decomposition. K Modified Co-Mn-Al mixed oxide with Co:Mn:Al molar ratio 4:1:1 and K content of 2 wt. % was chosen as catalyst for direct NO decomposition. Mixed oxide was prepared by two methods – calcination of hydrotalcite precursor and calcination of corresponding nitrates. Two methods of promoter addition were applied: bulk promotion and impregnation by pore filling method. Prepared catalysts were characetrized by AAS, XRD, SBET, TPR-H2 and TPD-CO2. Catalyst prepared by bulk promotion method and calcinated at 600 °C showed the best catalytic properties – it was stabilized after 5 hours measuring and NO conversion was 41 % at 650 °C (1000 ppm NO/N2, GHSV = 6 l•g-1•h-1). By correlation of NO conversion with physico-chemical properties of catalyst it was found out that NO conversion is dependent on K content, specific surface area and amount of basic centres.