Near ambient pressure XPS investigation of the interaction of ethanol with Co/CeO2(1 1 1)

Ovari L, Krick Calderon S, Lykhach Y, Libuda J, Erdohelyi A, Papp C, Kiss J, Steinrück HP (2013)

Publication Type: Journal article, Original article

Publication year: 2013

Journal

Original Authors: Ovari L., Krick Calderon S., Lykhach Y., Libuda J., Erdohelyi A., Papp C., Kiss J., Steinrück H.-P.

Publisher: Elsevier

Book Volume: 307

Pages Range: 132-139

DOI: 10.1016/j.jcat.2013.07.015

Abstract

Near ambient pressure X-ray photoelectron spectroscopy was applied to study the interaction of ethanol (CHCHOH) with a well-ordered CeO(1 1 1) film on Cu(1 1 1) and with a Co/CeO(1 1 1)/Cu(1 1 1) model catalyst. The oxidation state of the surface and the chemical nature of reaction intermediates were analyzed. At 300 K, the oxidation state of ceria decreased gradually with increasing ethanol pressure. At a constant pressure of 0.1 mbar, the reduction of Ce to Ce increased significantly between 320 and 600 K due to a higher mobility of oxygen or Ce centers at elevated temperatures. The main intermediate, ethoxide, was formed by dissociative adsorption of ethanol at room temperature. No coke formation was observed up to 600 K on CeO. Upon deposition of metallic cobalt, partial reduction of ceria was observed, leading to the formation of Co sites but still leaving metallic Co in the metal particles. During the reaction of ethanol with the Co/CeO(1 1 1) model catalyst, the amount of Co decreased drastically with increasing temperature, and at 600 K, the majority of Co was metallic. This process was accompanied by the severe reduction of ceria and the formation of significant carbon deposits. © 2013 Elsevier Inc. All rights reserved.

Authors with CRIS profile

Additional Organisation(s)

Involved external institutions

University of Szeged / József Attila Tudományegyetem Szeged Hungary (HU)

How to cite

APA:

Ovari, L., Krick Calderon, S., Lykhach, Y., Libuda, J., Erdohelyi, A., Papp, C.,... Steinrück, H.-P. (2013). Near ambient pressure XPS investigation of the interaction of ethanol with Co/CeO2(1 1 1). Journal of Catalysis, 307, 132-139. https://doi.org/10.1016/j.jcat.2013.07.015

MLA:

Ovari, L., et al. "Near ambient pressure XPS investigation of the interaction of ethanol with Co/CeO2(1 1 1)." Journal of Catalysis 307 (2013): 132-139.

BibTeX: Download