Probing Pt-CeO2 interfacial interactions through adsorption characteristics of small molecules

Abstract

In this study, we prepared a Pt/CeO2/Cu(1 1 1) model catalyst and investigated CO and CO2 adsorption using infrared reflection absorption spectroscopy (IRRAS) and temperature-programmed desorption (TPD) techniques to gain insight into the interaction between Pt nanoparticles and the CeO2 support surface. Our observations revealed that the deposition of CeO2 at 700 K results in island formation on the Cu(1 1 1) surface, whereas at 520 K it leads to a more continuous film formation. Reducing the CeO2/Cu(1 1 1) surface enhances the CO and CO2 uptakes on CeO2. Pt nanoparticles deposited on these surfaces remained in a metallic form, and during CO desorption, they facilitate the oxidation of CO to form CO2 by utilizing lattice oxygen from the interface between them and CeO2.