CUED Publications database

Atmospheric pressure X-ray photoelectron spectroscopy apparatus: Bridging the pressure gap.

Velasco-Vélez, JJ and Pfeifer, V and Hävecker, M and Wang, R and Centeno, A and Zurutuza, A and Algara-Siller, G and Stotz, E and Skorupska, K and Teschner, D and Kube, P and Braeuninger-Weimer, P and Hofmann, S and Schlögl, R and Knop-Gericke, A (2016) Atmospheric pressure X-ray photoelectron spectroscopy apparatus: Bridging the pressure gap. Rev Sci Instrum, 87. 053121-.

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Abstract

One of the main goals in catalysis is the characterization of solid/gas interfaces in a reaction environment. The electronic structure and chemical composition of surfaces become heavily influenced by the surrounding environment. However, the lack of surface sensitive techniques that are able to monitor these modifications under high pressure conditions hinders the understanding of such processes. This limitation is known throughout the community as the "pressure gap." We have developed a novel experimental setup that provides chemical information on a molecular level under atmospheric pressure and in presence of reactive gases and at elevated temperatures. This approach is based on separating the vacuum environment from the high-pressure environment by a silicon nitride grid-that contains an array of micrometer-sized holes-coated with a bilayer of graphene. Using this configuration, we have investigated the local electronic structure of catalysts by means of photoelectron spectroscopy and in presence of gases at 1 atm. The reaction products were monitored online by mass spectrometry and gas chromatography. The successful operation of this setup was demonstrated with three different examples: the oxidation/reduction reaction of iridium (noble metal) and copper (transition metal) nanoparticles and with the hydrogenation of propyne on Pd black catalyst (powder).

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:29
Last Modified: 05 Oct 2017 02:21
DOI: