Peculiarities of the Oscillatory Behavior in the Catalytic Reaction of CO Oxidation over the Supported Palladium Nanoparticles with the Dynamically Changing Surface Morphology: Monte Carlo Model
Тезисы доклада (Meeting Abstracts),
12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
22-26 сент. 2014
||Physical Chemistry 2014 : 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Belgrade, Serbia, September 22-26, 2014 : Proceedings
Society of Physical Chemists of Serbia. Belgrade.2014.
1187 c. ISBN 9788682475309.
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, prosp. Acad. Lavrentieva, 5, 630090, Novosibirsk-90, Russia
Novosibirsk State University, 630090, Novosibirsk-90, Russia
Institute of Computational Mathematics and Mathematical Geophysics, Siberian Branch of the Russian Academy of Sciences, prosp. Acad.
Lavrentieva, 6, 630090, Novosibirsk-90, Russia
The stochastic model of the oscillatory dynamics in the CO oxidn. reaction over the supported Pd nanoparticles (the driving force of oscillations is the formation and consumption of the subsurface oxygen on the metal nanoparticle) has been proposed. Furthermore it is necessary to take into account the contribution of COads diffusion over the support onto the active metal particle surface (reverse spillover) giving the addnl. source of COads flux to the particle through its perimeter. The dependence of the oscillatory dynamics on the size and surface roughening of the supported particle has been studied. The presence of COads spillover dets. the character of surface waves over the Pd nanoparticle - oxygen wave propagates from the central region of the particle to the perimeter, and the COads reverse wave moves from the perimeter, always enriched by COads, to the center of the particle. If the d. of nanoparticles on the support is enough high, the synchronization of oscillations between neighboring Pd nanoparticles only due to diffusion of COads over the support surface is possible.