National Repository of Grey Literature 7 records found  Search took 0.00 seconds. 
Pertraction Using Chiral Membranes for Racemic Mixture Separation.
Gaálová, Jana ; Stibor, Ivan ; Cuřínová, Petra ; Izák, Pavel
During pertration experiments we find out, that kinetics of the pertration significantly influence the enantiomer resolution what that facilitated transport is employed.
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Laboratory Separation of Methanol from the Azeotropic Mixture (25 wt% Methanol and 75 wt% trimethylborate.
Gaálová, Jana ; Vojtek, Lukáš ; Izák, Pavel
The work deals with laboratory separation of methanol from the azeotropic mixture (25 wt% methanol and 75 wt% trimethylborate). Four different manufactured membranes were tested. For all except one separation, separation was more or less successful. With PVA 4155-80 / 2871 the separation proceeded with good results, but very slowly, a condition that could increase the reaction rate could be an increase of temperature. Most selective membrane from Sulzer was PDMS 4155 -30/305 R, which separated MeOH with high efficiency and fast enough. The completely opposite effect than pervious membranes had the membrane PDMS 4060, which instead of MeOH separated Trimethylborate.
New Membranes with Immobilizing Chiral Selector for Racemic Micture Separation.
Gaálová, Jana ; Cuřínová, Petra ; Stibor, Ivan ; Izák, Pavel
Enantiomers exhibit identical properties in the achiral environment, however, they often differ in effectiveness, pharmacological activity and pharmacokinetic profile since the modules with which they interact in biological systems are also optically active [1,2]. Racemic immobilizing chiral selector is present. Five types of membranes with different amount of chiral selector were used. During the pertraction experiments the membranes were subsequently placed between the feed and receiving phase of the pertraction cell. During pertraction experiments we find out, that kinetics of the pertraction significantly influence the enantiomer resolution what indicated that facilitated transport is employed; while enantioselective sorption activity of the membranes reached up to 100%.
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Separation of Trimethyl Borate from Azeotrope Mixture by Pervaporation.
Izák, Pavel ; Lasnier, S. ; Vojtek, L. ; Tadic, T. ; Gaálová, Jana
The main conclusion of the study deals with the fact that PDMS membranes favourably removes the methanol while PVA membranes are able to transport preferentially\nTrimethyl borate under the same experimental conditions.
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Total Oxidation of Ethanol over Au/Ce0.5Zr0.5O2 Catalysts.
Topka, Pavel ; Kaluža, Luděk ; Gaálová, Jana
The aim of this work was to investigate in a detail the effect of Au loading on the catalytic performance of ceria-zirconia supported catalysts in the total oxidation of ethanol.
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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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