III International Conference

PP-III-32Ru-CeO 2 /CARBON CATALYSTS IN WET AIR OXIDATION OF ORGANICPOLLUTANTSDobrynkin N., Batygina M., Noskov A.Boreskov Institute of Catalysis SB RAS, Novosibirsk, RussiaE-mail: dbn@catalysis.ruThe present work is focused on the development of the methodology of design ofheterogeneous catalysts for processes of catalytic wet air oxidation (CWAO) of organicsubstances in a water phase. The presentation is widely covered specific aspects of theselection of catalysts for practical application, problems of preparation, catalytic activity,selectivity, deactivation and durability of catalysts, as well as the peculiarities of the oxidationmechanisms of variety organic molecules in water solutions. The practical recommendationsare formulated and considered.The development and study of Ce-promoted carbon-supported Ru catalysts in wet airoxidation of organic pollutants (starting with phenol, aniline, alcohols, acids, ethers andending with chloroorganics) of a various structure are the objectives of the consideration inthis work. The main principles of design of catalysts are based on specific requirements forthe selection of catalysts of practical application stated in work and as well on thepeculiarities of the oxidation mechanisms of variety molecules in water solutions. There aretwo aims to be intensively pursued in developing CWAO catalysts: to boost catalytic activityby creation of new chemical compositions and to increase the catalyst stability by applicationof new synthetic materials. In the Boreskov Institute of Catalysis, intensive studies arefocused on metal catalysts supported on modifications of porous graphite-like materials of theSibunit family. Sibunit is superior to conventional active carbons in the stability in aggressiveand oxidative media; it behaves as adsorbent and catalyst in liquid-phase oxidation of variouscompounds with oxygen. Pure Sibunit samples were shown to be active catalysts for organicpollutants oxidation, including hard-to-oxidize phenol and aniline. So it was used in thepresent study as universal support, both as a catalyst and an adsorbent simultaneously. Thechoice of a catalytic system Ru-CeO 2 /Carbon is justified by results of studies of varietycatalytic systems (oxides and supported noble metals Ru-, Pt-, Pd-/C), shown the highestefficiency of Ru-CeO 2 /Carbon (the combination of activity in deep oxidation of a carbonchain and selectivity of formation of molecular nitrogen or sulfates) for oxidation of variousnitrogen -, sulfur-, and chlorine-containing compounds at T = 160 – 200 o C, P O2 = 0.3 - 1.0MPa.528