III International Conference

SOME ASPECTS OF THE SELECTION OF STRUCTURE OF IRON-OXIDEPP-II-32CATALYTIC SYSTEMS FOR DEHYDROGENATION OF HYDROCARBONSEmekeev A.A., Ahmerov O.I., Fedorov G.I., Harlampidi H.E.The Kazan state technological university, Kazan, RussiaE-mail: emekeev_a.a@mail.ruInfluence of iron(III) oxides of different modification, and also compounds of alkalimetals, rare-earth elements and compounds of transition metals of variable valence oncatalytic activity of reaction of dehydrogenation of ethyl benzene in styrol is investigated.Now dehydrogenation catalysts used in an industry differ by a diversity of structures andmethods of synthesis which in many respects define production characteristics of catalyticsystems.Despite of an abundance of experimental data and theoretical premises till the presentmoment there is no common opinion about the nature of the active component of the catalyst.The analysis of literary data has shown, that iron(III) oxides of different modification,ferrites, and also compounds of alkali metals, rare-earth elements and compounds of transitionmetals of variable valence are used upon synthesis of iron-oxide catalysts.Therefore the problem of elucidating of the role of separate components and theirinteraction upon catalysts synthesis is actual.Activity testing of catalytic systems in model reaction of dehydrogenation of ethylbenzene (EB) to styrene were carried out in flowing microcatalytic installation at temperature600 °С and weight ratio Н 2 О:EB 3:1. The analysis of reaction products was carried out by achromatographic method. Research of phase structure was carried out by a method of X-raydiffraction analysis and Messbauer spectroscopy.Synthesized catalytic systems represented the oxygenous compounds keeping except foriron oxides also compounds of potassium, chrome, molybdenum, cerium, etc. [1, 2].Experimental data on research of catalytic activity of single-component iron-oxidesystems has shown, that γ-iron(III) oxide and magnetite have the greatest activity. Conversionand selectivity of compounds is 28-35 % and 79-82 %, accordingly.The greatest increase of conversion at simultaneous increase of selectivity in contrast toone-component systems is observed at insertion of compounds of potassium in the structureof the catalyst. Probably, increase of activity of catalyst is connected with formation offerrites of a potassium during synthesis.221