Evidence for the Active Phase of Heterogeneous Catalysts through In Situ Reaction Product Imaging and Multiscale Modeling

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Abstract

We use multiscale modeling to analyze laser-induced fluorescence (LIP) measurements of the CO oxidation reaction over Pd(100) at near-ambient reaction conditions. Integrating density functional theory-based kinetic Monte Carlo simulations of the active catalyst into fluid-dynamical simulations of the mass transport inside the reactor chamber, we calculate the reaction product concentration directly above the catalyst surface. Comparing corresponding data calculated for different surface models against the measured LIP signals, we can discriminate the one that predominantly actuates the experimentally measured catalytic activity. For the probed CO oxidation reaction conditions, the experimental activity is due to pristine Pd(100) possibly coexisting with other (oxidic) domains on the surface.

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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Biocatalysis and Enzyme Technology

Keywords

  • multiscale modeling, laser-induced fluorescence, oxidation reaction over, Pd(100), catalytic activity, in-situ spectroscopy, density-functional, theory
Original languageEnglish
Pages (from-to)4514-4518
JournalACS Catalysis
Volume5
Issue number8
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes