III International Conference

PP-II-42SYNTHESIS OF CATALYSTS ON THE BASIS OF VANADIUM OXIDES ANDSOME METALS OF IV AND VI GROUPS OF THE PERIODICAL SYSTEM FOROXIDATION AND AMMOXIDATION OF ALKYLAROMATIC COMPOUNDS INTOALDEHYDES, CARBOXYLIC ACIDS AND NITRILESIvanovskaya F.A., Saurambaeva L.I., Mikhailovskaya T.P., Sembaev D.Kh.A.B. Bekturov Institute of Chemical Sciences of the Ministry of Education and Science of theRepublic of Kazakhstan, Almaty, Republic of KazakhstanE-mail: dauren.sb@mail.ruCatalytic properties of a number of oxides of metals of IV and VI groups of thePeriodical System and of the chemical compounds, which they form with V 2 O 5 , in oxidationand ammoxidation of alkylaromatic compounds have been studied with the purpose ofdetermination of their role in the formation of catalytic properties of the modified vanadiumoxidecatalysts. This information has offered a possibility to orient oneself in the choice of thecomposition of a multi-component oxide system in the process of searching of the routes forsynthesis of an efficient catalyst of oxidation and ammoxidation of alkylaromatic compounds.The work presents a study of the routes of synthesis of efficient catalysts with a prespecifiedset of chemical compounds and crystalline modifications of oxides, based on theinvestigation of chemical and phase compositions of a number of multi-component catalystsfrom vanadium (V) oxide and oxides of the metals of IV and VI groups of the PeriodicalSystem. Vanadium (V) oxide surpasses significantly many metal oxides by its catalyticactivity in oxidation and ammoxidation of alkylaromatic compounds. That is why upon themodification of vanadium (V) oxide by the additions of metal oxides, the role of the latterconsists in the formation of chemical compounds with V 2 O 5 , stabilization of definitecrystalline modifications of the components of the oxidic system, and an effect uponreactivity of vanadium pentoxide. All this gives grounds to consider this multi-phase system,formed upon the synthesis of catalysts, as an active “carrier’, the composition of which can beregulated, and in so doing to produce an effect upon activity and selectivity of a vanadiumoxidecatalyst.There has been studied an influence of Ti, Sn, Mo, Cr, W, Zr oxides and some of theirchemical compounds with V 2 O 5 upon thermal dissociation of vanadium (V) oxide, the rate ofwhich is connected with V 2 O 5 reactivity, and can be considered as a measure of activity of themodified vanadium-oxide catalysts. It has been shown that by the degree of influence uponthe rate of V 2 O 5 dissociation the oxides are arranged in the following row: TiO 2 (anatase) >WO 3 > TiO 2 (rutile) > Cr 2 O 3 > SnO 2 > MoO 3 > ZrO 2 .241