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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents



ID: 211718.0, Fritz-Haber-Institut / Physical Chemistry
Adsorption and interaction of ethylene on RuO2(110) surfaces
Authors:Paulus, Ursula A.; Wang, Yuemin; Bonzel, Hans P.; Jacobi, Karl; Ertl, Gerhard
Language:English
Date of Publication (YYYY-MM-DD):2005-02-17
Title of Journal:Journal of Physical Chemistry B
Journal Abbrev.:J. Phys. Chem. B
Volume:109
Issue / Number:6
Start Page:2139
End Page:2148
Copyright:© 2004 American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
Free Keywords:
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Bonzel HP, Forschungszentrum Jülich, ISG3, D-52425, Jülich, Germany
Identifiers:URL:http://pubs.acs.org/cgi-bin/abstract.cgi/jpcbfk/20...
DOI:10.1021/jp049080+
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