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Catalytic Methods in Decrease of N2O Emissions: II. Catalysts Based on Hydrotalcites – Results of Investigation.
Pacultová, K. ; Obalová, L. ; Kovanda, F. ; Jirátová, Květa ; Lacný, Z. ; Valášková, M.
Activity of the two- and three component catalysts prepared by calcinations of Ni, Cu, Co, Mn, Mg, Al hydrotalcites in various molar ratios, partly modified with Pt, Pd, La, or K, was studied. Influence of O2, NOx, or H2O present in the reaction mixture on activity and stability of the most active catalyst was also investigated. Based on the laboratory results the size of a hypothetical industrial reactor was calculated.
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Catalytic Decomposition of Nitrous Oxide over Calcined Hydrotalcite-like Compounds
Obalová, L. ; Kovanda, F. ; Jirátová, Květa ; Chmielová, M. ; Wichterle, K. ; Dorničák, V.
Mixed oxide based catalysts prepared by the thermal decomposition of Hydrotalcite-like compounds were used in catalytic decomposition of nitrous oxide into nitrogen and oxygen. The catalytic reaction was performed in a fixed-bed reactor at 1000 ppm N2O inlet concentration in the temperature range 603 - 723 K. Ni and Co-containing catalysts showed high activity in nitrous oxide decomposition. A very poor activity was observed for Mg-Al mixed oxide catalyst. The prepared catalysts were characterized by the thermal analysis, powder X-ray diffraction, infrared spectroscopy, BET surface area measurement, temperature-programmed reduction and temperature-programmed desorption. The determined reaction rate constants of N2O decomposition were approximately proportional to the amount of reducible components and inversely proportional to the amount of strong basic centres of catalyst.
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