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

Baran Eren, Heath Kersell, Robert S. Weatherup, Christian Heine, Ethan J. Crumlin, Cynthia M. Friend, Miquel B. Salmeron

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    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.

    Original languageEnglish
    Pages (from-to)548-554
    Number of pages7
    JournalJournal of Physical Chemistry B
    Volume122
    Issue number2
    Early online date27 Jul 2017
    DOIs
    Publication statusPublished - 18 Jan 2018

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