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Structure of the Clean and Oxygen-Covered Cu(100) Surface at Room Temperature in the Presence of Methanol Vapor in the 10-200 mTorr Pressure Range.

Accepted version
Peer-reviewed

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Authors

Kersell, Heath 
Weatherup, Robert S  ORCID logo  https://orcid.org/0000-0002-3993-9045
Heine, Christian 

Abstract

Using ambient pressure X-ray photoelectron spectroscopy (APXPS) and high pressure scanning tunneling microscopy (HPSTM), we show that in equilibrium with 0.01-0.2 Torr of methanol vapor, at room temperature, the Cu(100) surface is covered with methoxy species forming a c(2 × 2) overlayer structure. In contrast, no methoxy is formed if the surface is saturated with an ordered oxygen layer, even when the methanol pressure is 0.2 Torr. At oxygen coverages below saturation, methanol dissociates and reacts with the atomic oxygen, producing methoxy and formate on the surface, and formaldehyde that desorbs to the gas phase. Unlike the case of pure carbon monoxide and carbon dioxide, methanol does not induce the restructuring of the Cu(100) surface. These results provide insight into catalytic anhydrous production of aldehydes.

Description

Keywords

0306 Physical Chemistry (incl. Structural)

Journal Title

J Phys Chem B

Conference Name

Journal ISSN

1520-6106
1520-5207

Volume Title

122

Publisher

American Chemical Society (ACS)
Sponsorship
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (656870)
Marie-Sklodowska Curie Individual Fellowship from European Union Horizon 2020 programme. St John's College Cambridge. US Department of Energy.