AVS 63rd International Symposium & Exhibition
    Surface Science Monday Sessions
       Session SS+AS+HC-MoM

Paper SS+AS+HC-MoM5
Adsorption and Activation of CO2 on Cu(997) at Low Temperature

Monday, November 7, 2016, 9:40 am, Room 104E

Session: Mechanistic Insights on Surface Reactions in Catalysis and at Novel Interfaces
Presenter: Jun Yoshinobu, The University of Tokyo, Japan
Correspondent: Click to Email
Adsorption and activation of carbon dioxide on Cu(997) were investigated by infrared reflection absorption spectroscopy (IRAS), temperature programmed desorption (TPD), and X-ray photoelectron spectroscopy (XPS). CO2 molecules are physisorbed on Cu(997) at temperatures below 70 K. However, the vibrational spectra of adsorbed CO2 depend significantly on the substrate temperature; IR spectra of CO2 vibrational modes at 70 K show asymmetric Fano line shapes. On the other hand, at 85 K, the dissociation of CO2 into CO was observed on Cu(997) by IRAS and XPS, but not on Cu(111). In addition, the reaction of CO2 on Cu(997) surface at 340 K under CO2 gas pressure of 0.8 mbar was investigated by ambient pressure XPS. A main reaction product on the surface was identified as carbonate (CO3), based on estimation of the composition ratio of oxygen to carbon. CO3 was produced on the surface through the reaction of CO2 with atomic oxygen formed from CO2 dissociation.