Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

OP-I-23Fig. 1. Scheme of the FIM mass-analysis implementedby the probe-hole technique. Reaction-diffusion frontmonitored during CO + O 2 reaction on the Pt(100) –oriented Pt field emitter – experiment [3].Fig. 2. Fine structure of the reaction zone.Black cells – O ads on (1x1) surface,grey cells – CO ads , white cells – empty Pt centres:Monte-Carlo simulation [2].The elliptic waves in the form of the propagating islands and spirals of adsorbed oxygenappeared on the model surface, if we take into account the anisotropy of the CO ads diffusiondue to missing row reconstruction of the Pd(110) plane induced by the adsorption [5]. Wefound that, if this effect is taken into account, such integral characteristics as the reaction rateand surface coverages do not change. However, the propagation of the wave on thereconstructed Pd(110)-(1x2) surface becomes noticeably anisotropic. In addition, thehysteresis in oscillatory behaviour has been found in simulation experiments under step-bystepvariation of oxygen partial pressure, i.e., two different oscillatory regimes could exist atone and the same parameters of the reaction [6, 7]. The parameters of oscillations, as well asthe shapes of the surface patterns (cellular, target, turbulent, spiral and stripe oxygen waves)depend on the dynamic prehistory of the system (shape-memory effect).Both experimental and simulation studies has been reviewed in [8, 9].The study was supported by RFBR grant # 08-03-00454.References1. Latkin E.I., Elokhin V.I., Matveev A.V., Gorodetskii V.V. J. Molec. Catal. A, Chemical, 2000, 158, 161-166.2. Latkin E.I., Elokhin V.I., Gorodetskii V.V. J. Molec. Catal. A, Chemical, 2001, 166, 23-30.3. Gorodetskii V.V.; Drachsel W. Appl. Catal. A: General, 1999, 188, 267-275.4. Latkin E.I., Elokhin V.I., Gorodetskii V.V. Chem. Eng. Journal, 2003, 91, 123-131.5. Matveev A.V., Latkin E.I., Elokhin V.I., Gorodetskii V.V. Chem. for Sustain. Develop., 2003, 11, 173-180.6. Matveev A.V., Latkin E.I., Elokhin V.I., Gorodetskii V.V. Chem. Eng. Journal, 2005, 107, 181-189.7. Elokhin V.I., Matveev A.V., Gorodetskii V.V., Latkin E.I. Lecture Notes in Comp. Sci., 2007, 4671, 401-409.8. Elokhin V.I., Gorodetskii V.V. In: Finely Dispersed Particles. Surfactant Science, vol. 130. A.M. Spasic, J.-P. Hsu, Eds.; Taylor & Francis, CRS Press: New York, 2005; Chapter 7, pp. 159-189.9. Gorodetskii V.V., Elokhin V.I., Bakker J.W., Nieuwenhuys B.E. Catalysis Today, 2005, 105, 183-205.70