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RESEARCH PRODUCT
Modelling of phase transitions and reaction at CO adsorption on oxygen precovered Pd(111)
E. E. TornauV. PetrauskasV.n. KuzovkovG. Zvejniekssubject
Phase transitionChemistryKineticsGeneral Physics and Astronomychemistry.chemical_elementSurfaces and InterfacesGeneral ChemistryCondensed Matter PhysicsKinetic energyOxygenSurfaces Coatings and FilmsCatalysisReaction rateAdsorptionPhase (matter)Physical chemistrydescription
Abstract Using the interaction parameters up to the third neighbors and activated form of O and CO diffusion and their reaction, the model has been proposed for Monte-Carlo simulations describing the catalytic O + CO → CO2 reaction and occurring phase transitions on Pd(1 1 1) surface. Upon adsorption of CO the pre-adsorbed oxygen transforms from p(2 × 2)O phase into 3 × 3 R 30 O ° and 3 × 3 R 30 O ° → p ( 2 × 1 ) O phases in the limit of room and moderate temperatures, respectively. We demonstrate that the kinetic effects determine both the occurrence of the p(2 × 1)O and disappearance of the 3 × 3 R 30 O ° phases at moderate and low temperatures, respectively. Using reaction rate as a fit parameter, we show that at room temperature the start of the reaction can be synchronized with the occurrence of 3 × 3 R 30 O ° phase.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-05-01 | Applied Surface Science |