Pt-Au/MO(x)-CeO(2) (M = Mn, Fe, Ti) Catalysts for the Co-Oxidation of CO and H(2) at Room Temperature

A series of nanostructured Pt-Au/MO(x)-CeO(2) (M = Mn, Fe, Ti) catalysts were prepared and their catalytic performance for the co-oxidation of carbon monoxide (CO) and hydrogen (H(2)) were evaluated at room temperature. The results showed that MO(x) promoted the CO oxidation of Pt-Au/CeO(2), but only the TiO(2) could enhance co-oxidation of CO and H(2) over Pt-Au/CeO(2). Related characterizations were conducted to clarify the promoting effect of MO(x). Temperature-programmed reduction of hydrogen (H(2)-TPR) and X-ray photoelectron spectroscopy (XPS) results suggested that MO(x) could improve the charge transfer from Au sites to CeO(2), resulting in a high concentration of Ce(3+) and cationic Au species which benefits for the CO oxidation. In-situ diffuse reflectance infrared Fourier transform spectroscopy (In-situ DRIFTS) results indicated that TiO(2) could facilitate the oxidation of H(2) over the Pt-Au/TiO(2)-CeO(2) catalyst.