Browsing by Author "Beschkov V."

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    Oxidation of sulfide ions in model solutions of sea water using of metal catalysts built in carbon matrix
    (2013-11-05) Dermendzhieva N.; Razkazova-Velkova E.; Martinov M.; Ljutzkanov L.; Beschkov V.
    The possibility of catalytic oxidation of sulfide ions from model solutions of seawater in a lab-scale model of fuel cell is studied. Two types of metal-containing catalysts (Mn u Co) incorporated in a matrix of activated carbon are synthesized. The metals are in the form of spinel-type oxides containing about 35 % vol. of the activated carbon. The processes of oxidation occurring in the anode space are considered. Experiments with different initial concentrations of sulfide ions (25-125 mg/dm-3) are carried out. The quantity of catalyst added into the solution volume is varied. The experiments are performed at room temperature and with constant mixing rate. The sulfide ions are oxidized above 90 % in about 3 hours for all initial concentrations by the use of both types of catalysts whereas the process is much slower without a catalyst (40 % in about 3 hours).
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    Study of the influence of different catalysts on the rate of oxidation of sulfide ions in model solutions of seawater
    (2014-01-01) Dermendzhieva N.; Razkazova-Velkova E.; Martinov M.; Ljutzkanov L.; Beschkov V.
    The possibility for catalytic oxidation of sulfide ions in model solutions of seawater is studied. The catalysts - synthesized metal oxides incorporated in a matrix of activated carbon, are characterized by iodine adsorption. The possibility for using activated carbon as a catalyst is also considered. The influence of the amount of the catalyst is investigated. The experiments are performed at room temperature, with a constant mixing rate and initial concentrations. The oxidation of sulfide ions in the anode compartment of a laboratory scale fuel cell is described. A comparison is made of the oxidation rate into a fuel cell with the catalytical oxidation without electrodes and electrical connections at the same conditions.