III International Conference

PP-I-26rates of partial and complete oxidation of ethylene on surface coverage by oxygen manifestthemselves as wave-shape curves with maximum.The standard characteristic of the catalytic activity is expressed by a system of the kineticequations of the reaction steps, obtained as result of their separate study on the surface ofcatalyst under standard state. For the over-all consideration of the kinetic regularities of thecatalytic reaction it may be presented in graph form as the functional dependencies of specificrates of partial and complete ethylene oxidation (the rates related to a unit ethylene pressure)on the ratio of reactant pressures, determined by applying the step steady-state conditions.The found standard characteristic of catalytic activity has been compared with the resultsof the experimental investigation of the catalytic reaction on pure Ag(110) and Ag(111) singlecrystal surfaces, performed in the work [6]. These results best of all known literature data fitthe model of the standard state of silver catalyst. The comparison has showed the principlesimilarity between the standard dependencies, obtained in present work, and the results of theinvestigation over single crystal surfaces.The suggested method of investigation the catalytic reaction is based on the separatestudy of the reaction steps kinetics; therefore, despite the steps are not elementary, it allowselucidating the real features of the molecular mechanism of the catalytic process.References1. G.K. Boreskov, 8th International Congress on Catalysis, Berlin (West), 2-6 July 1984,Proceedings, vol. 3, p. 231-242.2. А.I. Кurilenkо, Н.В. Кulkova, Н.А. Rybakovа, М.И. Тemkin, Zh. Fiz. Chim., 1958, vol. 32, n. 4,p. 797-805; n. 5, p. 1043-1048.3. А.V. Khasin, G.К. Boreskov, S.N. Filimonova, S.N. Goncharova, D.А. Bulushev. Dokl. Akad.Nauk SSSR, 1985, vol. 283, n. 6, p. 1431-1435.4. А.V. Khasin, Kinet. Katal., 1993, vol. 34, n. 1, p. 42-53.5. A.V. Khasin, React. Kinet. Catal. Lett., 2002, vol. 76, n. 2, p. 327-334.6. C.T. Campbell, J. Catal., 1985, vol. 94, n. 2, p. 436-444.55