III International Conference

PP-II-152METAL SUPPORTED CATALYSTS ON THE BASIS OF FIBROUS CARBONSULFOCATIONITE FOR REDUCTION-OXIDATION REACTIONSYegiazarov Yu.G., Radkevich V.Z., Potapova L.L., Khaminets S.G.Institute of Physical Organic Chemistry of the National Academy of Sciences, BelarusE-mail: radkevich_vz@ifoch.bas-net.byMetal supported catalysts on the basis of fibrous carbon sulfocationite prepared bymodification of the fibrous carbon material “carbopon” with sulfonated styrene-divinylbenzencopolymer were obtained. High activity of the synthesized catalytic systems in the reaction ofCO oxidation as well as electrodes for hydrogen-air fuel cell was determined.New types of activated carbons, such as carbon fabrics and nonwoven materials assupports of catalysts stimulate increasing interest.In present work nonwoven material carbopon (“Khimvolokno” assotiation, Svetlogorsk,Belarus) manufactured by carbonization of viscose fiber was used as raw material. Adsorptionand structural characteristics of carbopon: fiber diameter 5-10 µm, sorption volume (by water)0.64 cm 3 /g, mean pore diameter 23 Å, specific surface by nitrogen sorption 780 m 2 /g, electricresistance – no more than 1 ohm.On the first stage of the synthesis of the fibrous carbon sulfocationite (sulfocarbopon) rawcarbopon was modified with styrene-divinylbenzen copolymer by the radiochemical method.Thereto carbopon plates were saturated with monomer mixture and placed into the canal ofthe RHM-gamma-20 reactor with 60 Co core. Output power of irradiation was 4.6 kGr/h.Copolymer loading was varied by changing of irradiation dose.On the second stage of the synthesis a sulfonation was performed by treating of theobtained matrix with concentrated sulfuric acid (100 o C, 2 h).Series of samples of metal supported catalysts (Pt, Pd) on the basis of carbopon andsulfocarbopon were synthesized. Samples were prepared by the methods of metal depositionfrom hydrosol and ion exchange and were examined in the reaction of CO oxidation with airoxygen. The most active of those samples were platinum supported catalysts on the basis ofsulfocarbopon, prepared by multiple ion exchanges from the aqueous solution oftetraammineplatinum chloride followed by reduction of the metal in hydrogen atmosphereafter every stage of the ion exchange. In the presence of the sample 5.4Pt/sulfocarbopon(5 cycles of ion exchange – reduction) at 16 o С and space velocity of gas mixture (0.6 vol.%CO in air) comprised 600 h -1 , 100 % conversion of CO was reached. High catalytic activity of445