| 초록 |
The textural/structural characteristics, the reducibility of Si-modified Pt/CeO2 catalysts are investigated by X-ray powder diffraction (XRD), Raman spectra, temperature programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS) for the application of water-gas shiftreaction. On the basis of results of XRD, Raman spectra and XPS, Si-modified ceria has a smaller average crystallite size than pure ceria and a great deal of oxygen vacancies in the support which is directly related to the presence of Ce+3. The creation of oxygen defects by doping Si to ceria may offer excellent potential for increasing hydroxyl group on the surface of ceria and resulting in enhanced reducibility and consequently increased concentration of surface formate species, an intermediate for WGS reaction, as shown in the results of H2-TPR and DRIFTS. |
