Ethanol Adsorption, Decomposition and Oxidation on Ir(111): A High Resolution XPS Study

✍ Scribed by Cornelis J. Weststrate; Wiebke Ludwig; Johan W. Bakker; Andreea C. Gluhoi; Bernard E. Nieuwenhuys

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 329 KB
• Volume: 8
• Category: Article
• ISSN: 1439-4235
• DOI: 10.1002/cphc.200700055

✦ Synopsis

Abstract

Ethanol (C~2~H~5~OH) adsorption, decomposition and oxidation is studied on Ir(111) using high‐energy resolution, fast XPS and temperature‐programmed desorption. During heating of an adsorbed ethanol layer a part of the C~2~H~5~OH~ad~ desorbs molecularly, and another part remains on the surface and decomposes around 200 K; these two decomposition pathways are identified, as via acetyl (H~3~CCO) and via CO~ad~+CH~3ad~, respectively. Acetyl and CH~3ad~ decompose around 300 K into CH~ad~ (and CO~ad~). CH~ad~ decomposes forming C~x~ and H~2~ around 520 K. In the presence of O~ad~ an acetate intermediate is formed around 180 K, as well as a small amount of CH~3ad~ and CO~ad~. Acetate decomposes between 400–480 K into CO~2~, H~2~(/H~2~O) and CH~ad~.