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Study of catalytic reaction waves by SIMS
Jaroš, Antonín ; Willinger, Marc Georg (oponent) ; Bábor, Petr (vedoucí práce)
Catalytic reactions are crucial for many technological fields and understanding their mechanisms for further improvements require constant development of in-operando techniques. Operando spectroscopies are generally divided into two categories: large-area techniques, which provide averaged information from the whole analysed area but may miss the signal from important active sites, and localized techniques, which provide information on an atomic scale but may not include relevant active sites at all. We demonstrate that secondary ion mass spectrometry is an unprecedented way to monitor spatiotemporal oscillatory patterns during CO oxidation in real-time, providing micro-spectroscopic data that are essential for disentangling the complex catalytic reaction mechanism. We show that at low pressures the reaction waves comprise alternating waves of platinum oxide and CO-covered platinum. The driving mechanism of the reaction is oxide reduction by CO. Additionally, the oxide and CO adsorbates within oscillatory waves and especially at the wavefront are non-homogeneously distributed on the surface.

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