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Journal Article

Catalytic activity of RuO2(110) in the oxidation of CO


Wendt,  Stefan
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Wendt, S., Seitsonen, A. P., & Over, H. (2003). Catalytic activity of RuO2(110) in the oxidation of CO. Catalysis Today, 85(2-4), 167-175. doi:10.1016/S0920-5861(03)00384-5.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0EE8-B
The primary reason why the RuO2(1 1 0) surface is much more active in the oxidation of CO than the corresponding metal Ru(0 0 0 1) surface is correlated with the weaker oxygen bonding on RuO2(1 1 0) compared to chemisorbed oxygen on Ru(0 0 0 1). The RuO2(1 1 0) surface stabilizes at least two potentially active oxygen species, i.e., bridging O and on-top O atoms. Together with various adsorption sites for CO during the reaction, the CO oxidation reaction over RuO2(1 1 0) becomes quite complex. Using the techniques of temperature programmed reaction and desorption in combination with state-of-the-art density functional theory calculation we studied the CO oxidation reaction over RuO2(1 1 0) in the temperature range of 300–400 K. We show that the CO oxidation on RuO2(1 1 0) surface is not dominated by the recombination of CO with on-top O, although the binding energy of the on-top O is 1.4 eV lower than that of the bridging O atom.