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Titania Supported Co-Mn-Al Catalysts in Total Oxidation of Ethanol
Ludvíková, Jana ; Jirátová, Květa ; Klempa, Jan
In pelletized mixed oxide catalysts prepared by calcination of coprecipitated precursors, a considerable part of the pellets is not utilized in case of very fast catalytic reaction, due to the effect of internal and external diffusion. Therefore, deposition of thin active layer on a supporting material is advantageous. In this contribution, the effect of the support (titania grains and extrudates) on properties and catalytic activity in VOC oxidation of both catalyst geometric forms were examined.
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Modifikace směsných oxidů Co-Mn-Al promotory a jejich vliv na vlastnosti a aktivitu při oxidaci VOC
Mikulová, Z. ; Jirátová, Květa ; Klempa, Jan ; Kovanda, F.
The influence of the catalysts chemical composition and of the mode of promoters incorporation on the activity and selectivity in VOC oxidation was studied. In total oxidation of toluene, the most active Co4MnAl catalysts were those containing low concentration of potassium regardless the mode of modification, while in ethanol total oxidation the catalyst impregnated with higher potassium concentration (3 wt%) was the most active. Introduction of Pt and Pd in amounts 0.5 or 0.1 wt% into the Co4MnAl catalyst did not improve its catalytic activity. The impregnation method appears to be more effective mode of catalyst modification than the method using an addition of promoters in the stage of coprecipitation of the LDH precursor.
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