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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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Structured Heterogeneous Catalysts for Total Oxidation of Organic Compounds
Ludvíková, Jana
The report contains summary of preparation of structured catalytic systems, ceramic and metallic monoliths or ceramic foams, designated for total oxidation of volatile organic compounds. Various methods of depositing active phase on support are described. Also washcoating in order to obtain porous oxide layer, which is usually applied prior to active phase deposition, is included. Sol-gel method, suspension method or their combination are among the most frequent coating methods.
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Total Oxidation of Organic Compounds in Air over Oxide Catalysts
Ludvíková, Jana ; Jirátová, Květa ; Kovanda, F. ; Klempa, Jan
The aim of this work was investigation of the influence of various combinations of metals, Cu, Co, Ni, Mn or Al on properties of LDH (layered double hydroxides)-precursors and their calcined forms, examination of formation of these layered double hydroxides on a model support (anodized aluminum foil), and determination of catalytic activity of the calcined precursors in oxidation of ethanol as model compound.
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Aktivita směsných oxidů přechodných kovů nanesených na nosič Al2O3/Al při úplné oxidaci VOC
Jirátová, Květa ; Kovanda, F. ; Klempa, Jan ; Ludvíková, Jana ; Krúpa, L. ; Gaálová, Jana
The MII-(Mn)-Al and MII-Cu-(Mn)-Al LDH precursors (MII = Ni and/or Co) were deposited on Al2O3/Al support during hydrothermal reaction in aqueous solutions containing divalent metal cations. Only a slight incorporation of Mn into deposited solid was observed. The obtained LDH films consisted of thin platelet crystals oriented nearly perpendicularly to the support; their morphology did not change even after heating at 500 °C, when mixed oxides were formed. The deposited mixed oxides containing Cu showed reduction peaks at the lowest temperatures, and, from that reason, the Cu-containing catalysts, namely the Ni-Cu-(Mn)-Al sample was the most active in the total oxidation of ethanol.
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