Atomistic and multiscale modeling of CO-oxidation on Pd(100) and Rh(100): From nanoscale fluctuations to mesoscale reaction fronts

TitleAtomistic and multiscale modeling of CO-oxidation on Pd(100) and Rh(100): From nanoscale fluctuations to mesoscale reaction fronts
Publication TypeJournal Article
Year of Publication2009
AuthorsLiu DJ, Evans JW
Journal TitleSurface Science
Volume603
Pages1706-1716
Date Published06/01
ISBN Number0039-6028
Accession NumberISI:000266786500050
Keywordscarbon-monoxide, co oxidation, co-oxidation, energy-electron diffraction, fluctuations and reaction fronts, heterogeneous catalysis, kinetic monte carlo simulation, lattice-gas and multiscale modeling, monte-carlo-simulation, osci, single-crystal surfaces
Abstract

We describe recent developments in realistic multisite lattice-gas modeling of CO-oxidation on the unreconstructed (100) surfaces of Pd and Rh. Such models must incorporate the following features: multiple adsorption sites for CO; numerous short-ranged repulsive adspecies interactions; very high CO mobility and significant O mobility on the surface; and the appropriate Langmuir-Hinshelwood adsorption-desorption and reaction dynamics and energetics. The preferred binding site for CO depends on the substrate: bridge sites for Pd(100), and on-top sites for Rh(100). These models can address fundamental aspects of behavior for extended single-crystal surfaces: ordering and temperature-programmed-desorption for single-adspecies systems; mixed adlayer ordering and reactive steady-states as well as temperature-programmed-reaction for the two-adspecies reaction system. Such modeling is also effective in analyzing fluctuation effects for CO-oxidation in nanoscale systems, e.g., Field-Emitter-Tips or supported nanoclusters. A separate challenge is to incorporate this type of realistic atomistic-level description into a multiscale treatment of mesoscale spatial pattern formation and reaction front propagation where characteristic lengths are on the order of microns. This can be achieved within a heterogeneous coupled lattice-gas (HCLG) simulation approach which also requires as input a precise treatment of chemical diffusion in the mixed interacting adlayer. (C) 2009 Elsevier B.V. All rights reserved.

URL<Go to ISI>://000266786500050
DOI10.1016/J.Susc.2008.10.058