SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 29: Supported Nanoclusters: Structure, Reactions and Catalysis
O 29.3: Vortrag
Dienstag, 28. März 2023, 11:00–11:15, CHE 91
Structure of PdPt/CeO2/YSZ model systems in operando methane oxidation — •Jan-Christian Schober1,2, Silvan Dolling1,2, Thomas F. Keller1, and Andreas Stierle1,2 — 1DESY, Centre for X-ray and Nanoscience CXNS, Hamburg, Germany — 2Universität Hamburg, Germany
Due to the high ecological impact of gasoline and diesel fuels, natural gas and biofuel alternatives become more important than ever. Methane is a major component of natural gas and many bio fuels and has a much higher environmental impact than carbon dioxide. Thus, it is vital to ensure the elimination of methane in exhaust gas treatment systems. Pd and PdPt alloy NPs supported by ceria, are among the most active catalysts for the oxidation of methane. Yet, many questions about the interplay of the noble metals with the support, the involvement of palladium oxide species, the role of Pt, and the exact reaction mechanism in the low-temperature regime remain [1,3].
In order to track the active sites and elucidate structure function relationships on an atomistic level we prepare fully epitaxial model systems of PdPt alloy NPs supported by ceria thin films on YSZ single crystals. Using grazing incidence X-ray diffraction techniques in conjunction with our operando catalysis environments we were able to track activity by in-line mass spectrometry and structure of the model catalysts by following the ceria CTRs, as well as Pd, Pt, and their respective oxide Bragg peaks under operando conditions.
[1] J. Dong et al., ACS Catal. 10 (23), pp. 14304-14314.
[2] T. Adriana et al. Surface Science 616, pp. 206-213.