SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 81: Oxide and Insulator Surfaces I: Adsorption and Reaction of Small Molecules

O 81.6: Vortrag

Donnerstag, 30. März 2023, 16:15–16:30, CHE 91

Reduction of ceria with carbon monoxide - A high resolution, operando DRIFTS study — •Lachlan Caulfield, Eric Sauter, and Christoph Wöll — Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany

In the last decades, ceria-based systems have seen an increase in popularity, due to its unique redox behavior and catalytic characteristics. Ceria powders are widely used in exhaust catalysts as well as other catalytic cycles, in particular due to the cheap and simple preparation methods. To gain a better understanding of the chemical and structural behavior of ceria nanoparticles and their interaction with gaseous molecules, an operando DRIFTS study was carried out. Following the complete oxidation of the powder samples, they were introduced in a carbon monoxide atmosphere at room temperature. By tuning the pressure of carbon monoxide gas as well as the reaction temperature inside the catalytic cell it was possible to observe the reduction and structural changes of ceria, induced by the presence of carbon monoxide. Using operando DRIFTS with carbon monoxide as a reducing agent as well as a probe molecule, the chemical and structural changes of ceria can be easily investigated.