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Adsorption and interaction of ethylene on RuO2(110) surfaces

MPS-Authors
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Paulus,  Ursula A.
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Wang,  Yuemin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Bonzel,  Hans P.
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Jacobi,  Karl
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ertl,  Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Paulus, U. A., Wang, Y., Bonzel, H. P., Jacobi, K., & Ertl, G. (2005). Adsorption and interaction of ethylene on RuO2(110) surfaces. Journal of Physical Chemistry B, 109(6), 2139-2148. doi:10.1021/jp049080+.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0972-C
Abstract
Ethylene (C2H4) adsorbed on the stoichiometric and oxygen-rich RuO2(110) surfaces, exposing coordinatively unsaturated Ru-cus and O-cus atoms, is investigated by applying high-resolution electron energy-loss spectroscopy and thermal desorption spectroscopy in combination with isotope labeling experiments. On the stoichiometric RuO2(110) surface C2H4 adsorbs and desorbs molecularly. In contrast, on the oxygen-rich RuO2(110) surface ethylene adsorbs molecularly at 85 K and is completely oxidized through interaction with O-cus and O-bridge upon annealing to 500 K. The first couple of reactions are observed at 200 K taking place on Ru-cus: A change from pi- to sigma-bonding, formation of –C=O and –C–O groups, and dehydrogenation giving rise to H2O adsorbed at Ru-cus. Maximum reaction rate is reached for C2H4 chemisorbed at Ru-cus with O-cus neighbors on each side. A model for the first couple of reactions is sketched. For the final combustion, C2H4 reacts both with O-cus and O-bridge. Ethylene oxide is not detected under any circumstance.