Wykład naukowy, Dr Oleksii Bezkrovnyi
Title: In-situ study of the surface chemistry in catalysis: from fundamentals to practical aspects for green chemistry technologies.
Near Ambient Pressure X-ray Photoelectron Spectroscopy (NAP-XPS) is a novel technique for studying the surface chemistry of catalysts under in-situ conditions, which is a key step in understanding the synergy between metal species and the oxygen storage–release capacity of ceria. This interaction improves redox efficiency, stabilizes and disperses metal nanoparticles, and allows dynamic changes in their oxidation states, making M/CeO2 materials promising multifunctional catalysts for total oxidation of volatile organic compounds (VOCs) and CO which are responsible for formation of photochemical smog and pose serious risks to human health, converting them into relatively safe CO2.
In our study we investigates Au and Ru nanoparticles on ceria surfaces with varying step densities and reduction levels. Combining UHV, NAP-XPS, and synchrotron XPS, we reveal the in situ surface chemistry, oxidation states, and active-site stability, highlighting the synergy between metal nanoparticles and ceria—essential for rational catalyst design.
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