XPS and in-situ FTIR studies were conducted over the CuPd/CeO 2 catalysts to understand the nature of active species involved in the oxygen-assisted water-gas-shift reaction. The XP spectra collected in the valence band region, below 10 ev showed that Cu 3d bands were located close to the Fermi energy, indicating that Cu was mainly involved in chemical interaction, converting CO into CO 2. The overall spectral intensity decreased upon Pd addition, further supporting the core level observation that the Cu dispersion was improved by Pd addition. The XP spectra in the Pd 3d region indicated that the Pd was present mostly in Pd0 state in the catalyst containing both Cu and Pd, while significant amount of Pd + and/or Pd 2+ was present in the catalyst without Cu. The presence of copper helped retaining palladium in its metallic state. Thus, the existence of a synergistic interaction between Cu and Pd in the CuPd bimetallic catalysts supported on CeO 2 was observed from the XPS data. The existence of Cu-Pd alloy on the surface of these Cu-Pd bimetallic catalysts could be responsible for the higher catalytic activity for CO oxidation. This is an abstract of a paper presented in the ACS Fuel Chemistry Meeting Fall 2005 (Washington, DC Fall 2005).
|Original language||English (US)|
|Number of pages||2|
|Journal||Am Chem Soc Div Fuel Chem Prepr|
|State||Published - 2005|
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