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Materials 2015, 8(9), 6228-6256; doi:10.3390/ma8095302

Methanol Adsorption and Reaction on Samaria Thin Films on Pt(111)

1
Institute of Applied and Physical Chemistry & Center for Environmental Research and Sustainable Technology, University Bremen, Leobener Strasse UFT, Bremen 28359, Germany
2
Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Jan Ingo Flege
Received: 13 August 2015 / Revised: 7 September 2015 / Accepted: 9 September 2015 / Published: 17 September 2015
(This article belongs to the Special Issue Epitaxial Materials 2015)
View Full-Text   |   Download PDF [4955 KB, uploaded 17 September 2015]   |  

Abstract

We investigated the adsorption and reaction of methanol on continuous and discontinuous films of samarium oxide (SmOx) grown on Pt(111) in ultrahigh vacuum. The methanol decomposition was studied by temperature programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRRAS), while structural changes of the oxide surface were monitored by low-energy electron diffraction (LEED). Methanol dehydrogenates to adsorbed methoxy species on both the continuous and discontinuous SmOx films, eventually leading to the desorption of CO and H2 which desorbs at temperatures in the range 400–600 K. Small quantities of CO2 are also detected mainly on as-prepared Sm2O3 thin films, but the production of CO2 is limited during repeated TPD runs. The discontinuous film exhibits the highest reactivity compared to the continuous film and the Pt(111) substrate. The reactivity of methanol on reduced and reoxidized films was also investigated, revealing how SmOx structures influence the chemical behavior. Over repeated TPD experiments, a SmOx structural/chemical equilibrium condition is found which can be approached either from oxidized or reduced films. We also observed hydrogen absence in TPD which indicates that hydrogen is stored either in SmOx films or as OH groups on the SmOx surfaces. View Full-Text
Keywords: rare earth oxide; thin film; samaria; inverse catalysts; temperature programmed desorption (TPD) rare earth oxide; thin film; samaria; inverse catalysts; temperature programmed desorption (TPD)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jhang, J.-H.; Schaefer, A.; Zielasek, V.; Weaver, J.F.; Bäumer, M. Methanol Adsorption and Reaction on Samaria Thin Films on Pt(111). Materials 2015, 8, 6228-6256.

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