Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 69: Surface Reactions and Heterogeneous Catalysis 2

O 69.5: Vortrag

Donnerstag, 8. September 2022, 16:15–16:30, H4

Combining Planar Laser-Induced Fluorescence with Stagnation Point Flows for Small Single-Crystal Model Catalysts: CO Oxidation on a Pd(100)Jianfeng Zhou1, •Sebastian Matera2,4, Sebastian Pfaff1, Sara Blomberg1,3, Edvin Lundgren1, and Johan Zetterberg11Lund University, SE-22100 Lund, Sweden — 2Freie Universität Berlin, D-14195 Berlin, Germany — 3Lawrence Berkeley National Laboratory, Berkeley, CA 94720-8229, USA — 4Fritz-Haber-Institut der MPG, D-14195 Berlin, Germany

Mass transfer limitations can have a tremendous impact on catalysts characterization and must be accounted for by an appropriate modelling and, if possible, reactor design. We present a stagnation flow reactor for reaction product imaging by planar laser-induced fluorescence (PLIF), which is amenable to efficient low order modeling. Using CO oxidation over a Pd(100) single crystal as a showcase, we discuss the peculiarities for the case of small single-crystal model catalysts. While the ideal stagnation flow equations are not valid in this limit, a slightly modified theory can be derived, which exploits the information encoded in the PLIF signal. This combination of PLIF and half-theory/half-data driven modelling allows to efficiently analyze the experimental data and to estimate the turnover frequency and the CO2, CO and O2 concentrations at the surface from solely the CO2 profile at some distance of the surface.

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