Catalytic Oxidation of NO to NO2 Over Co–Ce–Zr Solid Solutions: Enhanced Performance of Ce–Zr Solid Solution by Co

Abstract

The oxidation of NO to NO2 was investigated on Co–Ce–Zr solid solutions prepared by the sol–gel method. An improvement of the catalytic activities of the samples was observed for Co-contained catalysts compared to Ce–Zr solid solution. The ZCCo0.36 catalyst exhibited more than 50 % NO conversion rate in the temperature range from 250 to 350 °C. The chemico-physical properties of catalysts were characterized by XRD, Raman spectroscopy, BET, XPS and NO-TPD. The results indicated that the introduction of cobalt into the lattice of Ce–Zr solid solution increased the amount of Ce3+ and facilitated the oxygen mobility. The features may be responsible for the improving of catalytic activities of Co–Ce–Zr metal-oxides for NO oxidation.