III International Conference

PP-II-59PREPARATION AND STUDIES OF BULK URANIUM OXIDE CATALYSTSKuntsevich S.V., Ismagilov Z.R., Shikina N.V., Ushakov V.A., Rudina N.A., Rogov V.A.,Kuznetsov V.V., Lazarchuk V.V. 1 , Balakhonov V.G. 1 , Matyuha V.A. 1 , Drobyaz A.I. 2 ,Khlytin A.L. 2Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia1 Siberian Chemical Complex, Seversk, Russia2 Plant of Chemical Concentrates, Novosibirsk, RussiaE-mail: ksv@catalysis.ruUranium and uranium oxides have unique electronic structures. Uranium based catalystscan be used for a number of catalytic reactions, because of the ability of their electrons tointeract with numerous organic and inorganic compounds. Uranium oxides may be used ascatalysts, promoters and carriers. We have studied physicochemical properties of the samplesprepared by different methods and their catalytic activity in the butane and methane deepoxidation reactions. It was shown that phase composition, structure and activity of samplesdepend on calcination temperature and a preparation method. Change of catalytic activity inthe deep oxidation of butane and methane reactions was confirmed by temperatureprogrammed reduction with hydrogen.Electron structures of uranium and uranium oxides induce scientists to investigate themlast years. The main field of application of uranium oxides is the nuclear industry. But at thetime other branches of application of uranium compounds are known [1]. It is well known thaturanium oxides are active for a number of processes of deep and selective oxidation. Theuranium oxides-based catalysts were successfully tested in reactions of oxidation of volatileorganic compounds such as benzene, toluene, butane, chlorobutane, chlorobenzene,thrichloroethylene, cyclohexanone and butylacetate [2, 3].This work is systematic investigation of uranium oxides for their subsequent modificationand application for preparation of supported catalysts. The bulk uranium oxides weresynthesed by two methods: precipitation from uranyl nitrate (UO 2 (NO 3 ) 2 ) solution andthermal decomposition of this salt.The samples of deposited oxides were prepared by addition of the 25 % ammoniaaqueous solution to uranyl nitrate aqueous solution with subsequent washing, filtration,drying and calcination at 300, 500, 600, 800, 1000 and 1100 ºС. The samples obtained bythermal decomposition were prepared by calcination of uranyl nitrate at 300, 500, 600, 800and 1000 ºC in air. Phase composition of the samples was studied by X-ray diffraction270