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TDS and EELS observations for CO, O2, and CH3OH bound to Ru(0001)/Cu
1986 (Engelska)Ingår i: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 172, nr 1, s. 151-173Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The electronic properties of monolayers of copper atoms adsorbed onto a Ru(0001) single crystal surface have been studied with thermal desorption spectroscopy (TDS) and high resolution electron energy loss spectroscopy (EELS) utilizing carbon monoxide (CO), dioxygen (O2), methanol (CH3OH), and to some extent water (H2O) as chemical probes. Whereas a three-monolayer-thick film exhibits most properties of a Cu(111) crystal distinct deviations are found at lower Cu coverages. TDS as well as EELS show a weakened Ru---CO bond and a strengthened Cu---CO bond as a result of metal-metal interaction. The stronger Cu---CO bond is accompanied by a higher probability for O2 dissociation. The mobilities of copper and oxygen atoms are such that annealing to 650 K produces an overlayer structure which is independent of adsorption sequence: Cu/O2 or O2/Cu, but where Ru---O as well as Cu---O vibrations can be identified. Methanol adsorbs reversibly on a monolayer of copper atoms. Metal bound methoxy species are formed in the presence of oxygen atoms. The decomposition paths of such methoxy intermediates alter towards more formaldehyde (CH2O) relative to CO with increasing copper and methoxy coverages.

Ort, förlag, år, upplaga, sidor
1986. Vol. 172, nr 1, s. 151-173
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URN: urn:nbn:se:ltu:diva-5233DOI: 10.1016/0039-6028(86)90588-1Lokalt ID: 3473ca50-386c-11dd-8721-000ea68e967bOAI: oai:DiVA.org:ltu-5233DiVA, id: diva2:978107
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Upprättat; 1986; Bibliografisk uppgift: Am. Chem. Soc., Div. Pet. Chem., Prepr. , Vol/Issue: 31:1, 191. American Chemical Society national meeting, 13 Apr 1986, New York, NY, USA, pp 307-316; 20080612 (ysko)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2017-11-24Bibliografiskt granskad

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