Studies of the Dispersion State of CrOx on ZrO2 and NO-CO Reaction on CrOx/ZrO2 Catalyst

The effect of CrOx on resisting nodulizing of ZrO2 and the dispersion state of CrOx have been studied using XRD and BET techniques. The results indicate that CrOx is an effctive antisintering agent for ZrO2, and it also opposes the tetragonal → monoclinic transition. The strong interaction between CrOx and ZrO2 is beneficial to the dispersion of CrOx on ZrO2 surface. The TPD-MS experiments of NO show that there are two types of adsorbed NO species which interact with CrOx/ZrO2 catalyst in differrent strength. Dissociation of NO occurs in the process of temperature programmed desorption. The experiment indicates that N2O is an intermediate of NO-CO reaction. At lower temperature large amount of N2O will be produced while amount of N2 will be larger at higher temperature.