Combined near-ambient pressure photoelectron spectroscopy and temporal analysis of products study of CH4 oxidation on Pd/γ-Al2O3 catalysts
| Autor: | Joachim Pasel, Ralf Peters, Dirk Schmitt, Joachim Mayer, Heinrich Hartmann, Jonas Werner, Jürgen Dornseiffer, Astrid Besmehn |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Exhaust gas 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Slip (ceramics) Redox Catalysis 0104 chemical sciences Adsorption X-ray photoelectron spectroscopy Chemical engineering visual_art ddc:540 visual_art.visual_art_medium 0210 nano-technology Temporal analysis of products Ambient pressure |
| Zdroj: | Catalysis today 360, 444-453 (2021). doi:10.1016/j.cattod.2019.12.026 special issue: "S0920586119306753" |
| ISSN: | 0920-5861 |
| DOI: | 10.1016/j.cattod.2019.12.026 |
| Popis: | Vehicles that run on natural gas must be equipped with an exhaust gas after-treatment system to burn their unavoidable CH4 slip, which must not be released into the environment as CH4 is a potent greenhouse gas. Pd is known as a highly active catalyst material for CH4 oxidation. For this study, Pd was deposited on a γ-Al2O3 support and the as-received samples were pre-reduced and pre-oxidized, respectively. Near-Ambient Pressure Photoelectron Spectroscopy and the Temporal Analysis of Products methodology were combined to understand that both electronic states, namely PdO and Pd°, are active for the CH4 oxidation reaction, whereby the superior activity of the pre-reduced Pd/γ-Al2O3 catalyst was ascribed to the spill-over of OH-groups from the support to Pd. It was found that the reaction products, CO, CO2 and H2, were strongly and, to a large extent, adsorbed on the catalyst surface and were involved in reversible chemical interactions on the catalyst surface during the CH4 oxidation reaction on the Pd/γ-Al2O3 catalyst. |
| Databáze: | OpenAIRE |
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