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  • Title: Ethylene decomposition at undercoordinated sites on Cu(410).
    Author: Kravchuk T, Vattuone L, Burkholder L, Tysoe WT, Rocca M.
    Journal: J Am Chem Soc; 2008 Sep 24; 130(38):12552-3. PubMed ID: 18729365.
    Abstract:
    We demonstrate the selective, low-temperature chemistry of ethylene on the strongly undercoordinated sites of Cu(410) by investigating its adsorption by high-resolution electron energy loss spectroscopy (HREELS), X-ray photoelectron spectroscopy (XPS), and temperature-programmed desorption (TPD). After dosing ethylene at approximately 110 K, apart from the expected pi-bonded species adsorbed on terraces, di-sigma-bonded ethylene and carbon are formed at the step edges. The latter product results from the complete dehydrogenation of ethylene and blocks sites for further dissociation and/or di-sigma-adsorption. However, these processes can be restored merely by heating the sample to 900 K, by causing the carbon to diffuse into the bulk. The presented results support the relevance of copper-based catalysts for the steam reforming process.
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