III International Conference

PP-II-61Deep oxidation of CB vapors by air on mixed uranium-transition metal (Cr, Mn, Co andCu) oxide catalysts was studied. It was shown that CO 2 selectivity was 100 % at 450-500 ºC.Addition of uranium oxides to mixed oxide catalysts lead to a significant increase of thecatalytic activity.The activity of uranium oxide catalysts containing transition metal oxides increases in thefollowing series: Cu/U/Al 2 O 3 < Co/U/Al 2 O 3 < Mn/U/Al 2 O 3 < Cr/U/Al 2 O 3 .The conversion of CB on mixed uranium - transition metal (Cr, Mn, Co and Cu) oxidecatalysts at 500 ºC was shown to decrease at an increase of CB concentration in the reactionmixture from 0.5 to 5.0 g/m 3 .The mixed uranium – transition metal oxide catalysts were shown to exhibit high activityand high stability in the reaction of chlorinated VOC oxidation. A very slight decrease of CBconversion, about 4-5%, was observed during an operation of the catalysts at 500ºC for 40hrs. Chlorine consumption by the uranium oxide catalyst was shown to be lower than 0.2% oftotal amount of chlorine feed into the reaction.Initial and spent catalysts were characterized by a number of physico-chemical methodsincluding XRD, S BET , FTIR etc. It was shown that an operation under reaction conditionsleads to change of phase composition and textural properties of the catalysts.This work was performed under the ISTC project No. 2799p.275