Composition and structure of the RuO2(110) surface in an O2 and CO environment: implications for the catalytic formation of CO2

Details Composition and structure of the RuO2(110) surface in an O2 and CO environment: implications for the catalytic formation of CO2 Composition and structure of the RuO2(110) surface in an O2 and CO environment: implications for the catalytic formation of CO2

2003-01-30

arxiv.org/abs/cond-mat/0301602v1

Phys. Rev. B 68, 045407 (2003)

Physics

Condensed Matter

Materials Science

12 pages including 8 figure files. Submitted to Phys. Rev. B. Related publications can be found at http://www.fhi-berlin.mpg.d

Scientific paper

10.1103/PhysRevB.68.045407

The phase diagram of surface structures for the model catalyst RuO2(110) in contact with a gas environment of O2 and CO is calculated by density-functional theory and atomistic thermodynamics. Adsorption of the reactants is found to depend crucially on temperature and partial pressures in the gas phase. Assuming that a catalyst surface under steady-state operation conditions is close to a constrained thermodynamic equilibrium, we are able to rationalize a number of experimental findings on the CO oxidation over RuO2(110). We also calculated reaction pathways and energy barriers. Based on the various results the importance of phase coexistence conditions is emphasized as these will lead to an enhanced dynamics at the catalyst surface. Such conditions may actuate an additional, kinetically controlled reaction mechanism on RuO2(110).

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