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

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Ovari L, Krick Calderon S, Lykhach Y, Libuda J, Erdohelyi A, Papp C, Kiss J, Steinrück HP
Zeitschrift: Journal of Catalysis
Verlag: Elsevier
Jahr der Veröffentlichung: 2013
Band: 307
Seitenbereich: 132-139
ISSN: 0021-9517


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.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Krick Calderon, Sandra
Lehrstuhl für Physikalische Chemie II
Libuda, Jörg Prof. Dr.
Professur für Physikalische Chemie
Lykhach, Yaroslava
Lehrstuhl für Physikalische Chemie II
Papp, Christian PD Dr.
Lehrstuhl für Physikalische Chemie II
Steinrück, Hans-Peter Prof. Dr.
Lehrstuhl für Physikalische Chemie II


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Einrichtungen weiterer Autorinnen und Autoren

University of Szeged / József Attila Tudományegyetem Szeged


Forschungsbereiche

D Catalytic Materials
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

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://dx.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: 

Zuletzt aktualisiert 2019-09-04 um 14:50