XPS observation of surface interaction between H2 and CO2 on platinum foil

Using XPS linearly adsorbed CO species were observed on Pt foil, as a result of the surface reaction between H2 and CO2 at room temperature. A small amount of bridged CO species was also detected upon adsorption of pure CO2 over Pt foil, which suggests partial decomposition of CO2. However, subsequent exposure to hydrogen removed the bridged CO species, while a small portion of additional linear CO species was formed.