NiO/Ce1−xNixO2−δ as an alternative to noble metal catalysts for CO oxidation

Abstract

A series of NiO/CeO₂ catalysts were prepared by using the combustion method and characterized by using XRD, N₂-physisorption, TEM, UV-visible, Raman, XPS, ICP-OES and H₂-TPR. Typical results indicated the NiO/CeO₂ had a better performance than CeO₂ for CO oxidation and 15 wt% NiO/CeO₂ is active and stable, whereas catalysts with a higher NiO content of 20 and 30 wt% deactivated at 130 °C onwards. The high activity and excellent stability of 15% NiO/CeO₂ catalysts can be ascribed to their high oxygen vacancy, high dispersion of NiO and strong metal–support interaction that leads to synergy between NiO and CeO₂.