Abstract
We present a novel spectroscopic approach using a combination of operando Raman/UV–Vis spectroscopy and operando IR spectroscopy. It is demonstrated that a ceria supported gold catalyst exhibits the same catalytic activity profile in both setups when using room temperature CO oxidation as model reaction. Detailed analysis of the UV–Vis and visible Raman spectra during reaction reveals changes in the oxidation state of gold and the number of oxygen-vacancy defects in ceria. DRIFT spectra provide complementary information on adsorbates, in particular carbonates and hydrogen carbonates, as well as hydroxyl groups. Time-resolved operando spectra allow for a direct correlation with catalytic activity thus providing detailed information on activation and deactivation processes of ceria supported gold particles.
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