Probing active sites for carbon oxides hydrogenation on Cu/TiO₂ using infrared spectroscopy.

ABSTRACT: The valorization of carbon oxides on metal/metal oxide catalysts has been extensively investigated because of its ecological and economical relevance. However, the ambiguity surrounding the active sites in such catalysts hampers their rational development. Here, in situ infrared spectroscopy in combination with isotope labeling revealed that CO molecules adsorbed on Ti³⁺ and Cu⁺ interfacial sites in Cu/TiO₂ gave two disparate carbonyl peaks. Monitoring each of these peaks under various conditions enabled tracking the adsorption of CO, CO₂, H_2, and H₂O molecules on the surface. At room temperature, CO was initially adsorbed on the oxygen vacancies to produce a high frequency CO peak, Ti³⁺-CO. Competitive adsorption

SUBMITTER: Shaaban E 

PROVIDER: S-EPMC9814513 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature