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O: Fachverband Oberflächenphysik

O 59: Oxide and Insulator Interfaces II

O 59.6: Vortrag

Mittwoch, 20. März 2024, 16:15–16:30, MA 144

Infrared spectroscopic investigations of the interaction between formic acid and ceria surfaces — •Zairan Yu, Shuang Chen, Alexei Nefedov, Christof Wöll, and Yuemin Wang — Institute of Functional Interfaces(IFG),Karlsruhe Institute of Technology(KIT), Eggenstein-Leopoldshafen, 76344, Germany

Formic acid (HCOOH) as a simplest carboxylic acid with carboxylate functional group is involved in a wide variety of industrial processes. Ceria shows excellent catalytic activity in numerous reactions due to the unique redox properties and high oxygen storage capacity. Given the great complexity of nanostructured ceria catalysts, a surface science study based on well-controlled model systems is required to provide reliable and comprehensive reference data. In this work, we present a systematic IR study of the interaction between HCOOH and CeO2 surfaces of both single crystals and nanoparticles using a sophisticated UHV apparatus dedicated to IRRAS experiments at grazing incidence on monocrystals and FTIR transmission measurements for powders. The polarization-resolved IRRAS revealed that the dissociative adsorption of HCOOH occurs on both oxidized and reduced CeO2(111) surfaces, giving rise to formate species in different adsorption configurations. The reliable reference IRRAS data acquired for ceria single-crystal surfaces allowed us to unambiguously assign the IR bands observed on ceria powder samples. This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)-Project-ID 426888090-SFB 1441.

Keywords: Surface science; Characterization; Metal oxides; Ultra-high vacuum; Reactions