rok 2007 - Fakulta chemickej a potravinÃ¡rskej technolÃ³gie

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DEPARTMENT OF INORGANIC TECHNOLOGY Head of Department: Prof. Pavel Fellner, PhD, DSc Telephone: +421252963637 Fax: +421252 92 01 71 E-mail: pavel.fellner@stuba.sk www.chtf.stuba.sk/kant I. STAFF Full Professors: Prof. Pavel Fellner, PhD, DSc. Associate Professors: Jana Gabčová, PhD, Ján Híveš, PhD, Marta Chovancová, PhD, Vladimír Danielik, PhD Assistant Professors : Research Fellows: Marta Ambrová, PhD., Zuzana Gáliková, Jana Jurišová, Vladimír Khandl, Matilda Zemanová, PhD PhD Students: Peter Čopan, Peter Mrkva, Alexandra Sýkorová, Dalibor Uher Technical staff: Daniela Dančová II. TEACHING AND RESEARCH LABORATORIES A. Teaching laboratories: Molten Salt Chemistry Laboratories Laboratories of Chemical Inorganic Syntheses and Industrial Inorganic Chemistry B. Research laboratories: Molten Salt Chemistry and Electrochemistry Laboratories Technical Electrochemistry Laboratories Electroplating, Special Coatings and Corrosion Laboratories III. TEACHING A. Undergraduate Study: 1. semester (Bc) Inorganic Technologies 2/3/0 Gabčová, Híveš Inorganic Technologies and Materials 2/0/0 Gabčová, Híveš 5. semester (Bc) Chemical and Food Technology 2/1/0 Danielik, Ambrová 5. semester (Bc) Corrosion and Material Surface Treatment 2/0/2 Chovancová 1. semester (MSc) Phase Equilibria 1/2/0 Gabčová Corrosion and Material Protection 2/1/0 Chovancová, Zemanová Applied Thermodynamics 2/2/0 Fellner, Danielik Laboratories I. 0/0/8 Gabčová, Híveš, Chovancová, Žúžiová Inorganic Technology II. 2/0/0 Gabčová, Híveš, Šíma 2. semester (MSc) Chemical Reaction Engineering 2/2/0 Híveš, Danielik Applied Electrochemistry 2/2/0 Híveš Laboratories II. 0/0/8 Gabčová, Híveš, Chovancová, Žúžiová 3. semester (MSc) Fertilizers 2/0/0 Gabčová Electrochemical Engineering 1/1/0 Híveš, Fellner Elements of System Engineering 1/1/0 Danielik Laboratories III. 0/0/10 Danielik, Fellner, Gabčová, Híveš, Chovancová, 4. semester (MSc) Diploma work 0/0/27 40
IV. CURRENT RESEARCH PROJECTS VEGA Project No 1/2109/05 The Use of the Pulse Technique on the Preparation of the Composite and Alloy Layers on the Metal Substrates (Marta Chovancová) Ni-W alloy coatings were prepared on the steel substrate. The content of tungsten in coatings was increased with the growing current density and the corrosion resistance raised with the tungsten content as well. Annealed coatings showed better anticorrosion properties than the non-annealed ones. The preparation of electrochemical composite coatings with nickel matrix and PTFE dispersion particles has been studied and their mechanical properties has been evaluated. The participation of solid Fe powder particles in the transfer of charge through the heterogeneous system consisting of an electrolyte and conducting powder particles was studied by means of electrochemical impedance spectroscopy. The quality of coloured anodic oxidation layer of aluminium was analysed in dependence on alternative and pulse reverse current and used pigmentation electrolyte. The quality of the pigmentation is determined not only by the nickel content but the morphology of the deposited nickel as well. Project duration: from January 2005 to December 2007 VEGA Project No 1/2108/05 The Chemical and Electrochemical Reactions of Sulphur Species at Aluminium Electrolysis (Pavel Fellner) The effect on the cathode and anode reactions when adding sodium sulphate to molten chlorides and fluorides was investigated by chronopotentiometry and cyclic voltammetry in the temperature range 820 °C – 1000 °C. The cathode process was explained under the assumption that Na 2 SO 4 thermally dissociates into Na 2 O and SO 3 , which is the electroactive species. The formation of sulphide was observed. The influence of sulphide on aluminium electrolysis will be discussed. The anode reaction of sulphate depends on the electrode material. On gold electrodes, no electrochemical activity of sulphate was observed. However, when a platinum anode was used, sulphate was oxidized to oxygen and SO 3 that decomposed thermally. When a normal carbon anode was used, the presence of COS and SO 2 in the anode gas leaving the laboratory aluminium cell was observed. Adsorption of SO 2 on alumina used in the aluminium industry (so-called smelter-grade alumina) was studied in the temperature range 15 °C – 120 °C. The specific surface area of the smelter grade alumina was 88 m 2 /g. It was found that at temperatures lower than 40 °C, sulphur dioxide is bonded to alumina reversibly by physical forces, and the adsorption can be described satisfactorily by the Langmuir adsorption isotherm. The heat of adsorption was estimated to be –33 kJ.mol -1 . At temperatures in the range 80 °C – 120 °C, which prevail in dry scrubbers in the aluminium industry, the heat of adsorption was determined to be –56 kJ.mol -1 . When SO 2 was adsorbed at temperatures higher than 80 °C, about 30 % of the SO 2 could not be desorbed when the samples were heated up to 250 °C. In the presence of SO 2 and oxygen, the formation of sulphate was determined at temperatures higher than 90 °C. Project duration: from January 2005 to December 2007 VEGA Project No 1/2476/05 Ferrates– Thermodynamics and Kinetics of Chemical and Electrochemical Reactions in Molten Electrolyte and on the Phase Boundary Electrode - Electrolyte (Ján Híveš) The main aim of this project was to examine the possibility of the preparation and provide first information on the behaviour of the iron in a transpassive region of potentials in molten hydroxides environment. Electrochemical measurements (cyclic voltammetry and chronopotentiometry) were performed in eutectic mixture of NaOH-KOH. A maximum value of polarization potential in anodic way plays very important role in the ferrate (VI) formation. Increasing of potential does not result in production of higher amount of ferrate (VI) but competitive reaction (evolution of oxygen) is getting more intensive. In the beginning of the DC electrolysis process the high current efficiency (91%) is reached but quickly decreases in time of electrolysis down to 14% at the lower temperatures. Regarding the higher temperatures at the beginning of electrolysis is reached the current efficiency equal to 72%. Then with increasing time of electrolysis the current efficiency drops slowly down to the value of 47% (3 h). Project duration: from January 2005 to December 2007 41
Page 1 and 2: ANNUAL REPORT 2007 Faculty of Chemi
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slowackiej. In Zywność a choroby
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mäsových výrobkov. . In Zborník
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industry and nuclear power plants.
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Kvasnička Vladimír Kvasnička Vla
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Slezská univerzita. - ISBN 978-80-
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products. To substantial products o
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Hronec M., Horváth B., Krejčová
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VÚRUP, j. s. co., Bratislava Hudec
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Institut Royal du Patrimoine Artist
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[3] Gilan, A., Mikula, M.: Lesk pap
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Paper Technology I. 3/0 Šutý Chem
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Pulp and Paper 2007. 30.-31.10.2007
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