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O: Fachverband Oberflächenphysik
O 88: Catalysis and surface reactions III
O 88.5: Vortrag
Donnerstag, 12. März 2026, 16:00–16:15, TRE/MATH
Bridging the Pressure and Materials Gaps in NO Adsorption on Ceria — •Lukas Bolz1, Ali Essa1, Zairan Yu1, Alexei Nefedov1, Julia Vecchietti2, Adrian Bonivardi3, Yuemin Wang1, and Christof Wöll1 — 1Insitute of Functional Interfaces, KIT, Eggenstein-Leopoldshafen, Germany — 2Instituto de Desarrollo Tecnológico para la Industria Química, UNL, Santa Fe, Argentina — 3Facultad de Ingenieria, UBA, Buenos Aires, Argentina
Nitric oxide (NO) is well known to have adverse effects on human health and the environment. One effective approach to decrease its emission is the selective catalytic reduction of NO over metal oxide surfaces. Understanding the reaction mechanisms, by tracking the structural changes of the active sites and intermediates as a function of reaction atmosphere and temperature, is crucial. Here, we present results on UHV-IRRAS and FTIRS as well as in situ/operando DRIFTS studies at atmospheric pressures and elevated temperatures to investigate the interaction between NO and ceria (CeO2). A reliable assignment of the IR bands observed in the complex DRIFTS spectra was achieved based on accurate references obtained for NO molecules adsorbed on single crystal surfaces and nanocrystalline powders, thereby bridging the material and pressure gap for oxidic catalysts. The combined results enabled the tracking of facet-dependent surface transformations, the adsorption and reaction of NO, and the formation of intermediates such as nitrous oxide (N2O). This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 426888090 - SFB 1441, project B03 and A04.
Keywords: Heterogenous Catalysis; Ceria; Nanoshapes; Nitric Oxide; DRIFTS