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Near Ambient Pressure XPS

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Carbon Dioxide Capture in Ionic Liquids

In this study we investigated the reaction mechanism for CO2 capture reaction of a ionic liquid in the outermost layers and compared them to its bulk. We were able to give a detailed analysis of the reaction products and the differences in the near surface region compared to the bulk IL from our NAP XPS measurements.
This study provides a fundamental insight into the reactions that occure in Carbon Capture and Storage (CCS) applications.
This study was conducted in collaboration with the group of F. Mayer (PC II) and P. Wasserscheid (CRT), Uni Erlangen. For more information please see I. Niedermayer et al. J. Am. Chem. Soc. 136 (2014) 436.

Fig. 1: Possible reaction mechanisms
Fig. 2: NAP XPS of the neat IL and the IL during the exposure to CO2 at 0.9 mbar.

Interaction of Ethanol with Co/CeO2(111)

The adsorption of ethanol on ceria and cobalt particles on ceria were investigated at pressures of up to 1 mbar. The adsorption of ethanol on the clean ceria lead to a gradual reduction with increasing pressure already at 300 K, with the reduction being more pronounced at higher temperatures. The main intermediate, ethoxide, was formed by dissociative adsorption of ethanol at room temperature. Upon deposition of metallic cobalt on ceria, partial reduction of ceria and the oxidation of the cobalt particles to Co 2+ was observed. The reaction of ethanol with the Co/CeO2(111) model catalyst up to 600 K led to severe reduction of cobalt and ceria, as well as coke formation.
This study was a collaboration with the University of Szeged, Hungary. Please see L. Ovari, et al. J. Cat. 307 (2013) 132 for more information.