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O: Fachverband Oberflächenphysik
O 50: Supported Nanoclusters: Structure, Reaction, Catalysis
O 50.5: Talk
Wednesday, March 20, 2024, 11:30–11:45, TC 006
Structure of Pd/CeO2/YSZ and Pd/Al2O3 model systems during methane oxidation light-off — •Jan Schober1,2, Mona Kohantorabi1, Birger Holtermann3, Nadejda Firman3, Thomas Keller1, Vedran Vonk1, Yolita Eggeler3, and Andreas Stierle1,2 — 1DESY, Hamburg, Germany — 2UHH, Hamburg, Germany — 3KIT (LEM), Karlsruhe, Germany
High ecological impact of gasoline and diesel fuels causes a shift to natural gas and biofuel alternatives. Methane is one of the major components of these fuels and has a much higher greenhouse gas effect. To eliminate methane from exhaust gases, heterogeneous catalysts using noble metal NPs of the Pt group with oxides such as Al2O3 and CeO2 as support. [1,2]. To track the active sites and elucidate structure function relationships on an atomistic level we prepare fully oxidized and epitaxial CeO2 thin films for NP support, suitable for catalytic studies using grazing incidence X-ray diffraction. This allows us to investigate open questions about the interplay of the NPs with the support, role of the support in the reaction, sintering behavior and reaction mechanism in the low-temperature regime [1]. Using our operando catalysis environments, we investigated Pd/Al2O3 and Pd/CeO2/YSZ catalysts during methane oxidation light-off experiments at ID31, ESRF with HEGIXRD. With in-line mass spectrometry we were able to track activity while capturing detailed structural information on NPs and support by continuously tracking high-symmetry planes of reciprocal space. [1] DOI: 10.1021/acscatal.0c03338. [2] DOI: 10.1016/j.susc.2013.06.014.
Keywords: Ceria; GIXRD; Palladium; Heterogeneous Catalysis; Methane