Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 69: Surface Reactions and Heterogeneous Catalysis 2

O 69.5: Talk

Thursday, September 8, 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 Matera^2,4, Sebastian Pfaff¹, Sara Blomberg^1,3, Edvin Lundgren¹, and Johan Zetterberg¹ — ¹Lund 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.